Updated on 2026/04/28

写真a

 
AOKI TAKAYUKI
 
Organization
Institute of Integrated Research Supercomputing Research Center Specially Appointed Professor
Title
Specially Appointed Professor
Other name(s)
Science Tokyo
External link

News & Topics
  • フォークボールの落ちる謎をスパコンで解明

    2021/03/25

    Languages: Japanese

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    要点-フォークボールの落ちる理由が「負のマグヌス効果」であることを初めて解明。-投げた直後の球速、回転速度、回転軸(ボールの縫い目)が分かれば、その後のボールの軌道が予測可能に。概要東京工業大学学術国際情報センターの青木尊之教授を研究代表者とする東工大・九州大・慶應大の共同研究チームは、令和2年度に

  • スパコン向けアプリケーション開発を大幅に容易にする手法を開発

    2016/11/21

    Languages: Japanese

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    要旨 理化学研究所(理研) 計算科学研究機構 プログラム構成モデル研究チームの丸山直也チームリーダーとモハメド・ワヒブ特別研究員、東京工業大学 学術国際情報センターの青木尊之教授の共同研究チームは、ハイ・パフォーマンス・コンピューティング(高性能計算技術)に関する世界最高峰の国際会議であるSC16[用語1]において最優秀論文賞を受賞しました。SC16では442報の論文が投稿され、共同研究チームは「適合格子細分化法[用語2]に関する論文」を投稿しています。

  • GPUs for atmospheric simulations

    2011/01/31

    Languages: English

  • 「気象庁の次世代気象モデルのフルGPU化に成功」80倍の高速化を達成

    2010/03/24

    Languages: Japanese

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    東京工業大学の青木尊之教授の研究室は,気象庁が次期気象予報に向けて開発を進めている次世代気象モデル(ASUCA)* のフルGPU化に成功しました。ASUCAは大気の鉛直方向の釣り合いを仮定せず,水蒸気の上昇による雲の形成や台風のシミュレーションを可能とする非静力平衡モデルです。東京工業大学では,GPU(Graphics Processing Unit) *と呼ばれる画像処理用のプロセッサを汎用計算GPGPU(General Purpose GPU)である気象モデルへ適用する研究を進めてきました。GPUはCPUと比べて計算の処理能力が非常に高く,消費電力当たりの演算性能が高いため,東京工業大学・学術国際情報センターのスパコン TSUBAME にも680個導入されています。GPGPUはパソコンに装着するビデオカードを転用することができるため,非常に低コストであるというメリットもあります。

Degree

  • Doctor of Science ( Tokyo Institute of Technology )

Research Interests

  • Muptiphase Flow Simulation

  • GPU Computing

  • High Performance Computing

  • Computational Fluid Dynamics

  • Sabo related simulation

  • Fluid-structure Interaction

  • Aerodynamics of Baseball

Research Areas

  • Informatics / High performance computing

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering  / Computational Fluid Dynamics

Education

  • Tokyo Institute of Technology   Interdisciplinary Science and Engineering

    1983.4 - 1985.3

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    Country: Japan

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  • Tokyo Institute of Technology   School of Science

    1979.4 - 1983.3

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    Country: Japan

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Research History

  • Institute of Science Tokyo   Specially Appointed Professor

    2025.4

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  • Institute of Science Tokyo   Institute of Integrated Research   Professor

    2024.10 - 2025.3

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  • Tokyo Institute of Technology   Global Scientific Information and Computing Center   Professor

    2001.4 - 2024.9

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  • Tokyo Institute of Technology

    1997 - 2001

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  • マックス・プランク量子光学研究所   客員研究員

    1992 - 1993

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  • コーネル大学プラズマ研究所   客員研究員

    1991 - 1992

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  • Tokyo Institute of Technology

    1986 - 1997

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  • Fujitsu Laboratories Ltd.

    1985 - 1986

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Professional Memberships

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Committee Memberships

  • (一財)高度情報科学技術研究機構   選定委員会委員  

    2020.7 - 2022.3   

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    Committee type:Government

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  • 日本学術振興会   スーパーグローバル大学創成支援プログラム委員会専門委員(中間評価部会委員)  

    2020.4 - 2021.3   

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    Committee type:Government

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  • 海洋研究開発機構   国立研究開発法人海洋研究開発機構 付加価値情報創生部門評価助言委員会委員  

    2020.2 - 2022.2   

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    Committee type:Government

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  • HPCI コンソーシアム   理事  

    2018.4 - 2020.3   

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    Committee type:Academic society

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  • PRACE (Europe)   Access Committee  

    2018.3 - 2020.3   

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    Committee type:Government

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  • 日本機械学会・計算力学部門   表彰委員会 委員長  

    2018   

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  • 学際大規模情報基盤共同利用・共同研究拠点   課題審査委員長  

    2017.12 - 2019.12   

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    Committee type:Academic society

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  • 日本機械学会・計算力学部門   平成29年度 部門長  

    2017   

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  • 日本学術振興会・学術システム研究センター   専門研究員  

    2016.4 - 2020.3   

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  • SPPEXA2 (独日仏) プロジェクト   Steeling Committee  

    2016 - 2020   

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  • 日本機械学会・計算力学部門   平成28年度 副部門長  

    2016   

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  • ポスト京重点領域⑥   諮問委員  

    2015.12 - 2019.12   

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    Committee type:Academic society

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  • SC15   Technical Paper Committee (Application Area)  

    2015   

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  • SC14   Scientific Visualization Committee  

    2014   

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  • SC13   Technical Paper Committee (Application Area)  

    2013   

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  • 第18回ビジュアリゼーションカンファレンス   実行委員長  

    2012   

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  • SC12   Technical Paper Committee (Application Area)  

    2012   

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  • SC11   Technical Paper Committee (Application Area)  

    2011   

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  • SIAM Conference on Computational Science and Engineering 2011   Organizing Committee  

    2011   

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  • 第17回ビジュアリゼーションカンファレンス   実行委員長  

    2011   

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  • SC09   Technical Paper Committee (Application Area)  

    2009   

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  • 日本計算工学会   編集委員、評議員  

    2008 - 2009   

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    Committee type:Academic society

    日本計算工学会

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  • 火薬学会   第36期 評議員  

    2008 - 2009   

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    Committee type:Academic society

    火薬学会

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  • 可視化情報学会   評議員  

    2008 - 2009   

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    Committee type:Academic society

    可視化情報学会

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  • 平成19年度衝撃波シンポジウム   実行委員長  

    2007   

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Papers

  • Aerodynamics study on sweeper

    Yuwei Yin, Takayuki Aoki, Seiya Watanabe, Hiromichi Kobayashi

    Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology   2025.12

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    Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications  

    Recent developments in professional baseball have introduced the “Sweeper” pitch, a variation of the traditional slider that exhibits pronounced lateral movement and minimal vertical drop. Despite its increasing use, the aerodynamic mechanisms behind its distinctive flight remain unclear. This study investigates the unsteady aerodynamic forces acting on the Sweeper, with a focus on the effects of seam geometry and spin efficiency. Using high-resolution computational fluid dynamics simulations based on the lattice Boltzmann method and a 3D-scanned model of an official Major League Baseball, we analyze the airflow and wake behavior around the ball. Our results show that asymmetric seam placement leads to asymmetric boundary layer separation on the upper and lower surfaces, resulting in a diagonally deflected wake and a longitudinal lift force not explained by the traditional Magnus effect. Simulated flight trajectories closely match MLB tracking data when the spin efficiency is between and . These findings highlight the critical role of seam-induced flow structures in shaping pitch behavior and provide new insights into the aerodynamic design and control of breaking pitches in baseball.

    DOI: 10.1177/17543371251395349

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    Other Link: https://journals.sagepub.com/doi/full-xml/10.1177/17543371251395349

  • Mother-leaf-method accelerated parallel-GPU AMR phase-field simulations of dendrite growth Reviewed

    Shinji Sakane, Ryosuke Suzuki, Takayuki Aoki, Tomohiro Takaki

    Computational Materials Science   244   113184   2024.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.commatsci.2024.113184

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  • Computing the permeability of tilted columnar dendrites with phase-field and lattice Boltzmann methods

    Tomohiro Takaki, Yasumasa Mitsuyama, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    International Journal of Thermofluids   2024.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ijft.2024.100649

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  • Coupled Lattice Boltzmann and Discrete Element Simulations of Ship-Ice Interactions

    Seiya Watanabe, Changhong Hu, Takayuki Aoki

    IOP Conference Series: Materials Science and Engineering   1288 ( 1 )   012015 - 012015   2023.8

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    Evaluating ice loads acting on ships is essential for the safety of ships navigating in ice-covered seas. In this study, we develop a CFD method to handle ship, ice, and fluid interaction. The lattice Boltzmann method, capable of large-scale calculations, is applied to the simulation of free-surface fluids. The ice motion is computed by solving the equations of motion of a rigid body, and the discrete element method models the ice-ice and ice-ship contact interactions. A momentum exchange scheme couples the lattice Boltzmann method and particle-based rigid body simulation. We introduce tree-based adaptive mesh refinement and multiple GPU computing to improve grid resolution and computational time. The proposed method is applied to model scale simulations of ship navigation in a brash ice channel. Simulations were performed for various conditions with different ice concentrations and ship velocities, and we observed that ice resistance increased with the ice concentration and the ship velocity increased. The ice motions and resistances obtained from our simulations are reasonable compared to model equations of Finnish-Swedish ice class rules (FSICR) and numerical analyses of a previous study.

    DOI: 10.1088/1757-899x/1288/1/012015

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    Other Link: https://iopscience.iop.org/article/10.1088/1757-899X/1288/1/012015/pdf

  • Free-surface flow simulations with floating objects using lattice Boltzmann method

    Seiya Watanabe, Jun Kawahara, Takayuki Aoki, Kenta Sugihara, Shinsuke Takase, Shuji Moriguchi, Hirotada Hashimoto

    Engineering Applications of Computational Fluid Mechanics   17 ( 1 )   2023.5

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/19942060.2023.2211143

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  • Natural Convection on Dendrite Morphology: A High–performance Phase–field Lattice Boltzmann Study

    Tomohiro Takaki, Shinji Sakane, Takayuki Aoki

    ISIJ International   63 ( 1 )   83 - 90   2023.1

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    Publishing type:Research paper (scientific journal)   Publisher:Iron and Steel Institute of Japan  

    DOI: 10.2355/isijinternational.isijint-2022-146

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  • Parallel-GPU-accelerated adaptive mesh refinement for three-dimensional phase-field simulation of dendritic growth during solidification of binary alloy

    Shinji Sakane, Tomohiro Takaki, Takayuki Aoki

    Materials Theory   6 ( 1 )   2022.12

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>In the phase-field simulation of dendrite growth during the solidification of an alloy, the computational cost becomes extremely high when the diffusion length is significantly larger than the curvature radius of a dendrite tip. In such cases, the adaptive mesh refinement (AMR) method is effective for improving the computational performance. In this study, we perform a three-dimensional dendrite growth phase-field simulation in which AMR is implemented via parallel computing using multiple graphics processing units (GPUs), which provide high parallel computation performance. In the parallel GPU computation, we apply dynamic load balancing to parallel computing to equalize the computational cost per GPU. The accuracy of an AMR refinement condition is confirmed through the single-GPU computations of columnar dendrite growth during the directional solidification of a binary alloy. Next, we evaluate the efficiency of dynamic load balancing by performing multiple-GPU parallel computations for three different directional solidification simulations using a moving frame algorithm. Finally, weak scaling tests are performed to confirm the parallel efficiency of the developed code.

    DOI: 10.1186/s41313-021-00033-5

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    Other Link: https://link.springer.com/article/10.1186/s41313-021-00033-5/fulltext.html

  • An ordered active parameter tracking method for efficient multiphase field simulations

    Yos Panagaman Sitompul, Takayuki Aoki, Seiya Watanabe, Tomohiro Takaki

    Journal of Computational Science   64   2022.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jocs.2022.101834

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  • Parallel GPU-accelerated adaptive mesh refinement on two-dimensional phase-field lattice Boltzmann simulation of dendrite growth

    Shinji Sakane, Takayuki Aoki, Tomohiro Takaki

    Computational Materials Science   211   2022.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.commatsci.2022.111507

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  • Parallel-GPU AMR implementation for phase-field lattice Boltzmann simulation of a settling dendrite

    Shinji Sakane, Takayuki Aoki, Tomohiro Takaki

    Computational Materials Science   211   2022.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.commatsci.2022.111542

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  • Phase-field study on an array of tilted columnar dendrites during the directional solidification of a binary alloy

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Computational Materials Science   203   111143 - 111143   2022.2

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.commatsci.2021.111143

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  • Tree Cutting Approach for Domain Partitioning on Forest-of-Octrees-based Block-structured Static Adaptive Mesh Refinement with Lattice Boltzmann Method Reviewed

    Yuta Hasegawa, Takayuki Aoki, Hiromichi Kobayashi, Yasuhiro Idomura, Naoyuki Onodera

    Parallel Computing   108   102851   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Parallel Computing  

    The aerodynamics simulation code based on the lattice Boltzmann method (LBM) using forest-of-octrees-based block-structured adaptive mesh refinement (AMR) with temporary-fixed refinement was implemented, and its performance was evaluated on GPU-based supercomputers. Although the Space-Filling-Curve-based (SFC) domain partitioning algorithm for the octree-based AMR has been widely used on conventional CPU-based supercomputers, accelerated computation on GPU-based supercomputers revealed a bottleneck due to costly halo data communication. Our new tree cutting approach adopts a hybrid domain partitioning with the coarse structured block decomposition and the SFC partitioning in each block. This hybrid approach improved the locality and the topology of the partitioned sub-domains and reduced the amount of the halo communication to one-third of the original SFC approach. In the strong scaling test, the code achieved maximum ×1.82 speedup at the performance of 2207 MLUPS (mega-lattice update per second) on 128 GPUs (NVIDIA® Tesla® V100). In the weak scaling test, the code achieved 9620 MLUPS at 128 GPUs with 4.473 billion grid points, while keeping the parallel efficiency of 93.4% from 8 to 128 GPUs.

    DOI: 10.1016/j.parco.2021.102851

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  • Gas-liquid two-phase flows simulation based on weakly compressible scheme with interface-adapted AMR method

    Shintaro Matsushita, Takayuki Aoki

    Journal of Computational Physics   445   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Academic Press Inc.  

    DOI: 10.1016/j.jcp.2021.110605

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  • Large-scale flow simulations using lattice Boltzmann method with AMR following free-surface on multiple GPUs Reviewed

    Seiya Watanabe, Takayuki Aoki

    Computer Physics Communications   264   107871 - 107871   2021.7

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cpc.2021.107871

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  • Real-Time Tracer Dispersion Simulations in Oklahoma City Using the Locally Mesh-Refined Lattice Boltzmann Method

    Naoyuki Onodera, Yasuhiro Idomura, Yuta Hasegawa, Hiromasa Nakayama, Takashi Shimokawabe, Takayuki Aoki

    Boundary-Layer Meteorology   179 ( 2 )   187 - 208   2021.5

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>We present ensemble-based large-eddy simulations based on a lattice Boltzmann method for a realistic urban area. A plume-dispersion model enables a real-time simulation over several kilometres by applying a local mesh-refinement method. We assess plume-dispersion problems in the complex urban environment of Oklahoma City on 16 July using realistic mesoscale velocity boundary conditions produced by the Weather Research and Forecasting model, as well as building structures and a plant-canopy model introduced into the plume-dispersion model. Ensemble calculations are performed to reduce uncertainties in the macroscale boundary conditions due to turbulence, which cannot be determined by the mesoscale model. The statistics of the plume-dispersion field, as well as mean and maximum concentrations, show that ensemble calculations improve the accuracy of the simulations. Factor-of-2 agreement is found between the ensemble-averaged concentrations based on the simulations over a 4.2 × 4.2 × 2.5 km2 area with 2-m resolution with the plume-dispersion model and the observations.

    DOI: 10.1007/s10546-020-00594-x

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    Other Link: https://link.springer.com/article/10.1007/s10546-020-00594-x/fulltext.html

  • Weakly compressible Navier-Stokes solver based on evolving pressure projection method for two-phase flow simulations Reviewed

    Kai Yang, Takayuki Aoki

    Journal of Computational Physics   431   110113 - 110113   2021.4

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    DOI: 10.1016/j.jcp.2021.110113

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  • A Simulation of Liquid Bridge between Two Particles using a Weakly Compressible Scheme

    Akira YOSHIIZUMI, Takayuki AOKI, Shintaro MATSUSHITA, Seiya WATANABE, Kai YANG

    JAPANESE JOURNAL OF MULTIPHASE FLOW   35 ( 2 )   294 - 301   2021.3

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    Publishing type:Research paper (scientific journal)   Publisher:The Japanese Society for Multiphase Flow  

    DOI: 10.3811/jjmf.2021.004

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  • GPU Acceleration of Multigrid Preconditioned Conjugate Gradient Solver on Block-Structured Cartesian Grid

    Naoyuki Onodera, Yasuhiro Idomura, Yuta Hasegawa, Susumu Yamashita, Takashi Shimokawabe, Takayuki Aoki

    The International Conference on High Performance Computing in Asia-Pacific Region   2021.1

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    Publishing type:Research paper (international conference proceedings)   Publisher:ACM  

    DOI: 10.1145/3432261.3432273

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  • Simulation of turbulent bubbly pipe flow with high density ratio and high reynolds number by using the lattice boltzmann method and a multi-phase field model Reviewed

    Yos Panagaman Sitompul, Takayuki Aoki, Tomohiro Takaki

    International Journal of Multiphase Flow   134   103505 - 103505   2021.1

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijmultiphaseflow.2020.103505

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  • Large-scale phase-field study of anisotropic grain growth: Effects of misorientation-dependent grain boundary energy and mobility

    Eisuke Miyoshi, Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Computational Materials Science   186   109992 - 109992   2021.1

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.commatsci.2020.109992

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  • A Large-scale Foam Simulation using Multi-phase-field Lattice Boltzmann Method with Adaptive Mesh Refinement

    Yos SITOMPUL, Aoki TAKAYUKI, Seiya WATANABE, Kenta SUGIHARA, Tomohiro TAKAKI

    The Proceedings of The Computational Mechanics Conference   2021.34   219 - 219   2021

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecmd.2021.34.219

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  • Multi-Scale and Multi-Physics Simulations for Gas-Liquid Two-Phase Flows

    AOKI Takayuki, MATSUSHITA Shintaro

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   65 ( 11 )   678 - 683   2020.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    Simulation of gas-liquid two-phase flows include multi-scale and multi-physics problems. We have developed a weakly compressible computational scheme for incompressible flows with a purely explicit time integration and successfully implemented on GPU (Graphics Processing Unit) providing very high computational performance. AMR (Adaptive Mesh Refinement) method is available for the scheme and high-resolution meshes are assigned dynamically near the region of the gas-liquid interface. The AMR method greatly enhances the computational efficiency and makes it possible to compute the dynamics of thin liquid film such as a soap bubble which is a typical multi-scale problem. At the surface, viscoelasticity becomes more important and transportation of surfactant should be taken into consideration. It has been confirmed that the Marangoni effect stabilizes and avoids breaking-up a thin film covering a bubble on the water surface against the gravity in the simulation.

    DOI: 10.18914/tribologist.65.11_678

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    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I030778045

  • Two-dimensional large-scale phase-field lattice Boltzmann simulation of polycrystalline equiaxed solidification with motion of a massive number of dendrites Reviewed

    Shinji Sakane, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Computational Materials Science   178   2020.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.commatsci.2020.109639

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  • A domain partitioning method using a multi-phase-field model for block-based AMR applications Reviewed

    Seiya Watanabe, Takayuki Aoki, Tomohiro Takaki

    Parallel Computing   102647 - 102647   2020.5

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.parco.2020.102647

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  • Large–scale phase–field lattice Boltzmann study on the effects of natural convection on dendrite morphology formed during directional solidification of a binary alloy Reviewed

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Computational Materials Science   171   2020.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.commatsci.2019.109209

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  • Inner and Outer-Layer Similarity of the Turbulence Intensity Profile over a Realistic Urban Geometry Reviewed

    Atsushi Inagaki, Yovita Wangsaputra, Manabu Kanda, Meral Yücel, Naoyuki Onodera, Takayuki Aoki

    SOLA   16   120 - 124   2020

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    Publishing type:Research paper (scientific journal)   Publisher:Meteorological Society of Japan  

    DOI: 10.2151/sola.2020-021

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  • QUANTIFICATION OF PARAMETER CONTRUBUTION IN GRANULAR FLOW SIMULATIONS USING THE DISCRETE ELEMENT METHOD

    Shuji MORIGUCHI, Hiroki OKUYAMA, Kenjiro TERADA, Yu OTAKE, Takayuki AOKI

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   76 ( 2 )   I_369 - I_377   2020

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejam.76.2_i_369

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  • A filtered cumulant lattice Boltzmann method for violent two-phase flows

    Yos Panagaman Sitompul, Takayuki Aoki

    Journal of Computational Physics   390   93 - 120   2019.8

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jcp.2019.04.019

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  • Acceleration of phase-field lattice Boltzmann simulation of dendrite growth with thermosolutal convection by the multi-GPUs parallel computation with multiple mesh and time step method Reviewed

    Shinji Sakane, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Modelling and Simulation in Materials Science and Engineering   27 ( 5 )   2019.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-651X/ab20b9

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  • Large-scale phase-field simulation of three-dimensional isotropic grain growth in polycrystalline thin films Reviewed

    Eisuke Miyoshi, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Shinji Sakane, Takayuki Aoki

    Modelling and Simulation in Materials Science and Engineering   27 ( 5 )   2019.5

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    DOI: 10.1088/1361-651X/ab1e8b

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  • Large-Scale Simulations for Free-Surface Flows with Objects by Lattice Boltzmann Method Reviewed

    Seiya WATANABE, Takayuki AOKI, Yuta HASEGAWA, Jun KAWAHARA, Hirotada HASHIMOTO

    JAPANESE JOURNAL OF MULTIPHASE FLOW   33 ( 1 )   55 - 62   2019.3

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    DOI: 10.3811/jjmf.2019.003

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  • 格子ボルツマン法による物体を含む自由界面流れの大規模シミュレーション Reviewed

    青木 尊之

    日本混相流学会誌「混相流」   33 ( 1 )   55 - 62   2019.3

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  • 界面に適合するAMR法を用いた気液二相流の数値シミュレーション Reviewed

    青木 尊之

    日本混相流学会誌「混相流」   33 ( 1 )   96 - 102   2019.3

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  • GPUスパコンによる混相流の大規模数値シミュレーション Reviewed

    青木 尊之

    日本計算数理工学会季刊誌「計算数理工学レビュー」   2019 ( 1 )   1 - 1   2019.3

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  • Permeability prediction for flow normal to columnar solidification structures by large–scale simulations of phase–field and lattice Boltzmann methods Reviewed

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    Acta Materialia   164   237 - 249   2019.2

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    DOI: 10.1016/j.actamat.2018.10.039

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  • Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method Reviewed

    Yuta HASEGAWA, Takayuki AOKI, Hiromichi KOBAYASHI, Keita SHIRASAKI

    Transactions od the JSME (in Japanese)   85 ( 870_18-00441 )   2019.2

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    We implement and perform large-scale LES analysis for running groups of cyclists. The mesh-refined lattice Boltzmann method (LBM) and coherent-structure Smagorinsky model (CSM) are adopted for the simulations to achieve a high performance computing on the recent GPU supercomputer. In the simulation with 16 cyclists, the mesh spacing around cyclists is 4 mm, and the total number of the mesh is up to 8.1×108 and the number of GPUs utilized is up to 64. Each calculation took 4 or 5 days for the 8~11 seconds of physical duration. The flow around 16 cyclists in various arrangement is calculated, and the results show that the in-line arrangement is more effective than the rhomboid arrangement in the viewpoint of the total aerodynamic drag of the group; however, a specific person in rhomboid arrangement can obtain larger drag reduction and save the endurance. Results on two groups also suggest that the frontal group in rhomboid arrangement will be exploited as the wind protection of the backward groups.

    DOI: 10.1299/transjsme.18-00441

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  • A weakly compressible scheme with a diffuse-interface method for low Mach number two-phase flows Reviewed

    Shintaro Matsushita, Takayuki Aoki

    Journal of Computational Physics   376   838 - 862   2019.1

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    DOI: 10.1016/j.jcp.2018.10.019

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  • Tracer dispersion simulation using locally-mesh refined lattice Boltzmann method based on observed data

    ONODERA Naoyuki, IDOMURA Yasuhiro, KAWAMURA Takuma, NAKAYAMA Hiromasa, SHIMOKAWABE Takashi, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2019 ( 0 )   260 - 260   2019

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    <p>Urban wind simulations are very important for designing smart cities, in which urban heat island is mitigated by designing wind flows, and for improving nuclear security by the prediction of plume dispersion in nuclear accidents. Since a lot of tall buildings and complex structures make the air flow turbulent in urban cities, multi-scale CFD simulations are needed. We develop the CityLBM code based on a Lattice Boltzmann Method (LBM) with a block-based Adaptive Mesh Refinement (AMR) method. The CityLBM code was optimized on GPU-based supercomputers using a communication reduction algorithms, and real time wind simulations were enabled. In this study, we introduced a nudging based data assimilation method for the boundary conditions of temperature and wind, which are given from the Weather Research and Forecasting (WRF) model, and plume dispersion simulations were conducted at more realistic wind conditions. In order to validate the CityLBM code, we analyzed the Joint Urban 2003 (JU2003) field study in Oklahoma City, and details of plume distribution were compared against the experiment.</p>

    DOI: 10.1299/jsmecmd.2019.32.260

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  • A Simulation of the Liquid Film with Interface-adapted AMR Method Reviewed

    MATSUSHITA Shintaro, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2019 ( 0 )   173 - 173   2019

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    <p>A fully explicit gas-liquid two-phase flow solver without solving Poisson equation based on weakly compressible assumption with interface-adapted AMR method is proposed to achieve high resolution simulation. Solving independent hyperbolic pressure evolution equation derived from isothermal Navier-Stokes equation allows us to achieve a fully explicit time integration. We have developed a GPU-code of the tree-based AMR method, which can greatly reduce the computational cost to assign high-resolution mesh to the region around the moving interfaces. The memory pool data structure having extra allocated space is prepared to prevent frequent memory allocation and deallocation to enhance the computational performance. The results of benchmarks have good agreements with that of incompressible solver and experiments. The soap bubble simulation using the finest mesh width (= 0.07825mm) on single GPU are demonstrated and the thin liquid film can be reproduced by achieving high-resolution two-phase flow simulation with explicit scheme and AMR method.</p>

    DOI: 10.1299/jsmecmd.2019.32.173

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  • Highly productive, high-performance application frameworks for Post-Petascale computing

    Naoya Maruyama, Takayuki Aoki, Kenjiro Taura, Rio Yokota, Mohamed Wahib, Motohiko Matsuda, Keisuke Fukuda, Takashi Shimokawabe, Naoyuki Onodera, Michel Müller, Shintaro Iwasaki

    Advanced Software Technologies for Post-Peta Scale Computing: The Japanese Post-Peta CREST Research Project   77 - 98   2018.12

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    DOI: 10.1007/978-981-13-1924-2_5

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  • 弱圧縮性流体解析手法に基づく完全陽解法による気液二相流 Invited

    青木 尊之

    日本混相流学会誌「混相流」   32 ( 4 )   巻頭   2018.12

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  • 陽解法による非圧縮性気液二相流の大規模シミュレーション Invited

    青木 尊之

    日本混相流学会誌「混相流」   32 ( 4 )   416 - 423   2018.12

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  • Correlation between three-dimensional and cross-sectional characteristics of ideal grain growth: large-scale phase-field simulation study Reviewed

    Eisuke Miyoshi, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Shinji Sakane, Takashi Shimokawabe, Takayuki Aoki

    Journal of Materials Science   53 ( 21 )   15165 - 15180   2018.11

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    DOI: 10.1007/s10853-018-2680-y

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  • Competitive grain growth during directional solidification of a polycrystalline binary alloy: Three-dimensional large-scale phase-field study Reviewed

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki, Charles André Gandin

    Materialia   1   104 - 113   2018.9

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    DOI: 10.1016/j.mtla.2018.05.002

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  • Tree-based mesh-refinement GPU-accelerated tsunami simulator for real-time operation Reviewed

    Marlon Arce Acuna, Takayuki Aoki

    Natural Hazards and Earth System Sciences (NHESS)   18 ( 9 )   2561 - 2602   2018.9

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  • GPUスパコンによるDEMの大規模シミュレーション Invited

    青木尊之

    精密工学会誌   84 ( 7 )   603 - 606   2018.7

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  • 粒子法の大規模シミュレーション Invited

    青木尊之

    日本シミュレーション学会「シミュレーション」   37 ( 2 )   14 - 19   2018.6

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  • Three-dimensional morphologies of inclined equiaxed dendrites growing under forced convection by phase-field-lattice Boltzmann method Reviewed

    Shinji Sakane, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Takashi Shimokawabe, Takayuki Aoki

    Journal of Crystal Growth   483   147 - 155   2018.2

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    DOI: 10.1016/j.jcrysgro.2017.11.029

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  • New High Performance GPGPU Code Transformation Framework Applied to Large Production Weather Prediction Code Reviewed

    Michel Muller, Takayuki Aoki

    ACM Transactions on Parallel Computing   2018.2

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  • A Computation with Tree-based AMR Method using Multi-moment Scheme for Conservative Phase-Field Equation with a Flux Term Reviewed

    MATSUSHITA Shintaro, AOKI Takayuki

    Transactions of the Japan Society for Computational Engineering and Science   2018 ( 0 )   20180005 - 20180005   2018

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    A phase-field model describes the gas-liquid interface of two-phase flows. We solve the conservative Allen-Cahn equation combined with the continuum equation on a two-dimensional computational domain with a given velocity field. The accuracy of numerical result strongly depends on the mesh resolution around the interface. The AMR (Adaptive Mesh Refinement) method greatly reduces the computational cost, since it is possible to assign high-resolution mesh to the region around the moving interface. We have developed a code to solve the equation in a manner of the tree-based AMR with multi-moment methods, the conservative IDO and CIP-CSL schemes. To reduce the implementation difficulties of AMR method, we introduce the fractional step method and the directional splitting method. In a benchmark test of the single vortex problem, the AMR computation with 5-level refinement for the interface achieves 9.26-times speed up and 1/12.3 mesh reduction to compare with the computation on a uniform mesh.

    DOI: 10.11421/jsces.2018.20180005

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  • Hybrid fortran: High productivity GPU porting framework applied to Japanese weather prediction model Reviewed

    Michel Müller, Takayuki Aoki

    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   10732   20 - 41   2018

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    DOI: 10.1007/978-3-319-74896-2_2

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  • A High-resolution Two-phase Flow Simulation using a Full-explicit Scheme with Interfaceadapted AMR Method Reviewed

    MATSUSHITA Shintaro, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2018 ( 0 )   222 - 222   2018

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    <p>A weakly compressible scheme for low-Mach number gas-liquid two-phase flows have been developed for a fullexplicit time integration to avoid solving Poisson equation. We introduce the fractional splitting method and directional splitting method to solve Euler equation which an efficient semi-Lagrangian scheme is applicable to. To describe the gas-liquid interface the conservative Allen-Cahn equation, which is one of the phase-field models, combined with the continuum equation is introduces. The accuracy of numerical results of two-phase flow strongly depends on the mesh resolution near the interface. The AMR (Adaptive Mesh Refinement) method greatly reduces the computational cost, since it is possible to assign high-resolution mesh to the region around the moving interface. We have developed a code to solve the equation in a manner of the tree-based AMR. Fractional step method and the directional splitting method helps to reduce the implementation difficulties of AMR method. We successfully carried out some violent two-phase flow simulation and flow including very thin liquid film by using the method which is combined weakly compressible scheme with AMR method.</p>

    DOI: 10.1299/jsmecmd.2018.31.222

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  • Multi-phase-field Method for Dynamic Domain Partitioning of AMR Applications Reviewed

    WATANABE Seiya, AOKI Takayuki, MATSUSHITA Shintaro, Conti Christian, TAKAKI Tomohiro

    The Proceedings of The Computational Mechanics Conference   2018 ( 0 )   213 - 213   2018

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    <p>In distributed implementations of stencil AMR applications, the inter-node communication time often represents a major performance bottleneck. Thus minimizing communication is an objective as important as maintaining a good load balance. We propose a new domain partitioning method for block-based AMR applications based on the multi-phase-field (MPF) model. The MPF model for polycrystalline growth minimizes the interfacial energy and forms a convex shape for each crystal grain. In our method, each phase of the MPF model represents a computational sub-domain. We show that the MPF partitioning can successfully keep the load balance and reduce the communication cost.</p>

    DOI: 10.1299/jsmecmd.2018.31.213

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  • Characterization of transition from Darcy to non-Darcy flow with 3D pore-level simulations Reviewed

    Ikkoh Tachibana, Shuji Moriguchi, Shinsuke Takase, Kenjiro Terada, Takayuki Aoki, Kohji Kamiya, Takeshi Kodaka

    SOILS AND FOUNDATIONS   57 ( 5 )   707 - 719   2017.10

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    DOI: 10.1016/j.sandf.2017.08.003

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  • 流体シミュレーションのコツ Invited

    肖鋒, 青木尊之

    応用物理   86 ( 10 )   904 - 909   2017.10

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  • Multi-GPUs parallel computation of dendrite growth in forced convection using the phase-field-lattice Boltzmann model Reviewed

    Shinji Sakane, Tomohiro Takaki, Roberto Rojas, Munekazu Ohno, Yasushi Shibuta, Takashi Shimokawabe, Takayuki Aoki

    JOURNAL OF CRYSTAL GROWTH   474 ( 2017 )   154 - 159   2017.9

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    DOI: 10.1016/j.jcrysgro.2016.11.103

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  • Phase-field-lattice Boltzmann studies for dendritic growth with natural convection Reviewed

    Tomohiro Takaki, Roberto Rojas, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takashi Shimokawabe, Takayuki Aoki

    JOURNAL OF CRYSTAL GROWTH   474 ( 2017 )   146 - 153   2017.9

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    DOI: 10.1016/j.jcrysgro.2016.11.099

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  • A Stencil framework to realize large-scale computations beyond device memory capacity on GPU supercomputers Reviewed

    Shimokawabe, Takashi, Endo, Toshio, Onodera, Naoyuki, Aoki, Takayuki

    Proceedings of 2017 IEEE International Conference on Cluster Computing (IEEE Cluster 2017) (Internet)   525 - 529   2017.9

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    Stencil-based applications such as CFD have succeeded in obtaining high performance on GPU supercomputers. The problem sizes of these applications are limited by the GPU device memory capacity, which is typically smaller than the host memory. On GPU supercomputers, a locality improvement technique using temporal blocking method with memory swapping between host and device enables large computation beyond the device memory capacity. Our high-productivity stencil framework automatically applies temporal blocking to boundary exchange required for stencil computation and supports automatic memory swapping provided by a MPI/CUDA wrapper library. The framework-based application for the airflow in an urban city maintains 80\% performance even with the twice larger than the GPU memory capacity and have demonstrated good weak scalability on the TSUBAME 2.5 supercomputer.

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  • A Numerical study of turbulence statistics and the structure of a spatially-developing boundary layer over a realistic urban geometry Reviewed

    Inagaki, Atsushi, Kanda, Manabu, Ahmad, N. H, Yagi, Ayako, Onodera, Naoyuki, Aoki, Takayuki

    Boundary-Layer Meteorology   164 ( 2 )   161 - 181   2017.8

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    The applicability of outer-layer scaling is examined by numerical simulation of a developing neutral boundary layer over a realistic building geometry of Tokyo. Large-eddy simulations are carried out over a large computational domain 19.2 km $\times$ 4.8 km $\times$1 km, with a fine grid spacing (2 m) using the lattice-Boltzmann method with massively parallel graphics processing units. Results from simulations show that outer-layer features are maintained for turbulence statistics in the upper part of the boundary layer, as well as the width of predominant streaky structures throughout the entire boundary layer. This is caused by the existence of very large streaky structures extending throughout the entire boundary layer, which follow outer-layer scaling with a self-preserving development. We assume the top-down mechanism in the physical interpretation of results.

    DOI: 10.1007/s10546-017-0249-y

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  • Ultra-large-scale phase-field simulation study of ideal grain growth Reviewed

    E. Miyoshi, T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    npj Computational Materials   3 ( 25 )   1 - 6   2017.7

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    DOI: 10.1038/s41524-017-0029-8

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  • Large-Eddy Simulation of the Gust Index in an Urban Area Using the Lattice Boltzmann Method Reviewed

    Nurul Huda Ahmad, Atsushi Inagaki, Manabu Kanda, Naoyuki Onodera, Takayuki Aoki

    BOUNDARY-LAYER METEOROLOGY   163 ( 3 )   447 - 467   2017.6

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    DOI: 10.1007/s10546-017-0233-6

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  • GPUによる粉体・混相流の大規模シミュレーション

    青木尊之

    化学工学 特集「大規模流動解析 on HPC 」   81 ( 5 )   232 - 235   2017.5

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  • A SIMULATION OF LARGE SCALE SEDIMENT FLOW EXPERIMENT USING DEM Reviewed

    MORIGUCHI Shuji, OHTA Yuma, TAKASE Shinsuke, TERADA Kenjiro, ABE Keita, AOKI Takayuki

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   72 ( 2 )   449 - 457   2017.1

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    In order to study suitable calculation conditions for estimating impact force of sediment flow using DEM, a simulation of a large scale sediment flow experiment was performed. By changing element size and element shape, the effects of thease factors were investigated in the simulation. Based on the obtained results, importance of element size and flow chracteristics of the spherical ekement and non-sherical eklement are analyzed. In addition, a flow of the estimation process is proposed, and some points of attention are summarized from the view points of engineering.

    DOI: 10.2208/jscejam.72.I_449

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    Other Link: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26220002/

  • Simulations of Free Surface Flow Interacting with Solid Particles Using Phase-field Method for Interface Capturing Reviewed

    WATANABE Seiya, AOKI Takayuki, HASEGAWA Yuta, MATSUSHITA Shintaro

    The Proceedings of The Computational Mechanics Conference   2017 ( 0 )   70 - 70   2017

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    DOI: 10.1299/jsmecmd.2017.30.070

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  • GPU Simulation for Vertical-Axis Wind Turbine by Overset Grid method

    SUGIHARA Kenta, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2017 ( 0 )   289 - 289   2017

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    DOI: 10.1299/jsmecmd.2017.30.289

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  • A Weakly Compressible Two-phase Flow Simulation on Cartesian Grids Reviewed

    MATSUSHITA Shintaro, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2017 ( 0 )   34 - 34   2017

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    DOI: 10.1299/jsmecmd.2017.30.034

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  • A fully conservative high-order upwind multi-moment method using moments in both upwind and downwind cells Reviewed

    Naoyuki Onodera, Takayuki Aoki, Kensuke Yokoi

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS   82 ( 8 )   493 - 511   2016.11

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    DOI: 10.1002/fld.4228

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  • Primary arm array during directional solidification of a single-crystal binary alloy: Large-scale phase-field study Reviewed

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takashi Shimokawabe, Takayuki Aoki

    ACTA MATERIALIA   118   230 - 243   2016.10

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    DOI: 10.1016/j.actamat.2016.07.049

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  • GPUスパコンによる大規模LBM計算 Reviewed

    青木尊之

    伝熱   55 ( 233 )   22 - 28   2016.10

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  • GPUを用いた超並列高速計算入門-?-GPUスパコンによる大規模物理シミュレーション

    青木尊之

    システム制御情報学会誌   60 ( 8 )   350 - 357   2016.8

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    DOI: 10.11509/isciesci.60.8_350

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  • High-performance GPU-kernel Generation Using C++ Template for a Computation for Lattice Boltzmann Method with Octree-based Adaptive Mesh Refinement Reviewed

    9 ( 2 )   34 - 45   2016.7

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  • Performance tuning on GPU for granular simulation based on discrete element method saving memory usage Reviewed

    Seiya Watanabe, Takayuki Aoki, Satori Tsuzuki

    Transactions of the Japan Society for Computational Engineering and Science   2016   2016.5

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    DOI: 10.11421/jsces.2016.20160013

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  • Two-dimensional phase-field study of competitive grain growth during directional solidification of polycrystalline binary alloy Reviewed

    Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Shinji Sakane, Takashi Shimokawabe, Takayuki Aoki

    Journal of Crystal Growth   442   14 - 24   2016.5

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    DOI: 10.1016/j.jcrysgro.2016.01.036

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  • GPUを用いた個別要素法による粉体シミュレーションに対するメモリ使用量を抑えた高速化手法 Reviewed

    渡辺勢也, 青木尊之, 都築怜理

    日本計算工学会論文集   ( 20160013 )   2016.5

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  • Two-dimensional phase-field study of competitive grain growth during directional solidification of polycrystalline binary alloy Reviewed

    Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Shinji Sakane, Takashi Shimokawabe, Takayuki Aoki

    JOURNAL OF CRYSTAL GROWTH   442   14 - 24   2016.5

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    DOI: 10.1016/j.jcrysgro.2016.01.036

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  • スーパーコンピューティングの展望 計算機とアルゴリズム

    中島研吾, 青木尊之

    日本計算工学会 20周年記念号2016   21 ( 1 )   30 - 33   2016.1

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  • Large-scale Phase-field Studies of Three-dimensional Dendrite Competitive Growth at the Converging Grain Boundary during Directional Solidification of a Bicrystal Binary Alloy Reviewed

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takashi Shimokawabe, Takayuki Aoki

    ISIJ INTERNATIONAL   56 ( 8 )   1427 - 1435   2016

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    DOI: 10.2355/isijinternational.ISIJINT-2016-156

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  • Effective Dynamic Load Balance using Space-Filling Curves for Large-scale SPH Simulations on GPU-rich Supercomputers Reviewed

    Satori Tsuzuki, Takayuki Aoki

    PROCEEDINGS OF SCALA 2016: 7TH WORKSHOP ON LATEST ADVANCES IN SCALABLE ALGORITHMS FOR LARGE-SCALE SYSTEMS   1 - 8   2016

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    DOI: 10.1109/ScalA.2016.5

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  • High-productivity Framework for Large-scale GPU/CPU Stencil Applications. Reviewed

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    International Conference on Computational Science 2016, ICCS 2016, 6-8 June 2016, San Diego, California, USA   1646 - 1657   2016

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    DOI: 10.1016/j.procs.2016.05.499

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  • 接触による粒子間相互作用のGPU計算での近傍探索手法 Reviewed

    渡辺勢也, 青木尊之, 都築怜理, 下川辺隆史

    情報処理学会論文誌コンピューティングシステム   8 ( 4 )   50 - 60   2015.11

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  • Performance modeling and analysis of heterogeneous lattice Boltzmann simulations on CPU-GPU clusters Reviewed

    Christian Feichtinger, Johannes Habich, Harald Koestler, Ulrich Ruede, Takayuki Aoki

    PARALLEL COMPUTING   46   1 - 13   2015.7

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    DOI: 10.1016/j.parco.2014.12.003

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  • 個別要素法による 粉体の大規模シミュレーション

    都築怜理, 渡辺勢也, 青木尊之

    TSUBAME ESJ   2   12 - 17   2015.3

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  • マルチフェーズフィールド法を用いた金属多結晶組織形成シミュレーションの大規模GPU計算

    山中晃徳, 岡本成史, 下川辺隆史, 青木尊之

    TSUBAME ESJ   13   2 - 6   2015.3

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  • GPU-accelerated 3D phase-field simulations of dendrite competitive growth during directional solidification of binary alloy Reviewed

    S. Sakane, T. Takaki, M. Ohno, T. Shimokawabe, T. Aoki

    MCWASP XIV: INTERNATIONAL CONFERENCE ON MODELLING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES   84 ( 12066 )   2015

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    DOI: 10.1088/1757-899X/84/1/012063

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  • Large-scale DEM Simulations Using Non-spherical Particles on GPU Reviewed

    Seiya Watanabe, Takayuki Aoki, Satori Tsuzuki

    Journal of the Society of Powder Technology, Japan   52 ( 12 )   730 - 734   2015

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    DOI: 10.4164/sptj.52.730

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  • Large eddy simulation of the gust factor using lattice Boltzmann method within a huge and high resolution urban area of Tokyo Reviewed

    A.N.Huda, A.Inagaki, M.Kanda, N.Onodera, T.Aoki

    J.Japan Society of Civil Engineers   71 ( 4 )   I_37 - 42   2015

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    DOI: 10.2208/jscejhe.71.I_37

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  • Large-scale multi-phase-field simulation of polycrystalline grain growth with finely dispersed particles

    Masashi Okamoto, Akinori Yamanaka, Takashi Shimokawabe, Takayuki Aoki

    Materials Science and Technology Conference and Exhibition 2015, MS and T 2015   1   603 - 609   2015

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  • GPU phase-field lattice Boltzmann simulations of growth and motion of a binary alloy dendrite Reviewed

    T. Takaki, R. Rojas, M. Ohno, T. Shimokawabe, T. Aoki

    MCWASP XIV: INTERNATIONAL CONFERENCE ON MODELLING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES   84 ( 12066 )   2015

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    DOI: 10.1088/1757-899X/84/1/012066

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  • Two-dimensional phase-field simulations of dendrite competitive growth during the directional solidification of a binary alloy bicrystal Reviewed

    Tomohiro Takaki, Munekazu Ohno, Takashi Shimokawabe, Takayuki Aoki

    ACTA MATERIALIA   81   272 - 283   2014.12

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    DOI: 10.1016/j.actamat.2014.08.035

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  • GPUコンピューティングによる大規模シミュレーション

    青木尊之

    プラズマ核融合学会誌・解説記事2014   90 ( 12 )   755 - 763   2014.12

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  • Efficient magnetohydrodynamic simulations on distributed multi-GPU systems using a novel GPU Direct-MPI hybrid approach Reviewed

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    COMPUTER PHYSICS COMMUNICATIONS   185 ( 7 )   1901 - 1913   2014.7

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    DOI: 10.1016/j.cpc.2014.03.018

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  • Global magnetohydrodynamic simulations on multiple GPUs Reviewed

    Un-Hong Wong, Hon-Cheng Wong, Yonghui Ma

    COMPUTER PHYSICS COMMUNICATIONS   185 ( 1 )   144 - 152   2014.1

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    DOI: 10.1016/j.cpc.2013.08.027

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  • 複数GPUによる格子に基づいたシミュレーションのためのマルチGPU コンピューティング・フレームワーク Reviewed

    下川辺隆史, 青木尊之, 小野寺直幸

    情報処理学会 HPCS 2013(ハイパフォーマンスコンピューティングと計算科学シンポジウム)   2014

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  • Large-Scale Simulation of Gas-Liquid-Solid Multiphase Flow on GPU Cluster Reviewed

    27 ( 5 )   607 - 613   2014

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    DOI: 10.3811/jjmf.27.607

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  • Direct Numerical Simulation and Large Eddy Simulation on a Turbulent Wall-Bounded Flow Using Lattice Boltzmann Method and Multiple GPUs Reviewed

    Xian Wang, Yanqin Shangguan, Naoyuki Onodera, Hiromichi Kobayashi, Takayuki Aoki

    MATHEMATICAL PROBLEMS IN ENGINEERING   2014 ( 742432 )   1 - 10   2014

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    DOI: 10.1155/2014/742432

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  • Large scale 3D multi-phase-field simulation of microstructure evolution using TSUBAME2.5 GPU-supercomputer

    Akinori Yamanaka, Masashi Okamoto, Takashi Shimokawabe, Takayuki Aoki

    3DMS 2014 - Proceedings of the 2nd International Congress on 3D Materials Science   59 - 64   2014

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    DOI: 10.1002/9781118990278.ch10

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  • A Geometric Multigrid Solver on Tsubame 2.0 Reviewed

    Harald Koestler, Christian Feichtinger, Ulrich Ruede, Takayuki Aoki

    EFFICIENT ALGORITHMS FOR GLOBAL OPTIMIZATION METHODS IN COMPUTER VISION   8293   155 - 173   2014

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  • High-productivity Framework on GPU-rich Supercomputers for Operational Weather Prediction Code ASUCA Reviewed

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    SC14: INTERNATIONAL CONFERENCE FOR HIGH PERFORMANCE COMPUTING, NETWORKING, STORAGE AND ANALYSIS   251 - 261   2014

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    DOI: 10.1109/SC.2014.26

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  • High-productivity Framework on GPU-rich Supercomputers for Operational Weather Prediction Code ASUCA Reviewed

    T. Shimokawabe, T. Aoki, N. Onodera

    in Proceedings of the 2014 ACM/IEEE conference on Supercomputing (SC'14)   12   29 - 34   2014

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  • GPU accelerated phase-field simulations during dendrite competitive growth of binary alloy polycrystal Reviewed

    T. Takaki, M. Ohno, T. Shimokawabe, T. Aoki

    Proceedings of 9th Pacific Rim International Conference on Modeling of Casting and Solidification Processes (MSCP 2014)   2014

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  • GPU スパコンにおける1 億個のスカラー粒子計算の強スケーリングと動的負荷分散 Reviewed

    都築怜理, 青木尊之, 下川辺隆史

    情報処理学会論文誌コンピューティングシステム IPSJ Transactions on Advanced Computing System (ACS   9 ( 3 )   82 - 93   2013.9

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  • CFDが描く流体潤滑の新しい世界

    丹愛彦, 青木尊之

    日本トライボロジー学会誌「トライボロジスト」   361 - 366   2013.6

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  • GPUスパコンTSUBAME2.0による大規模格子系アプリケーション

    青木尊之

    日本機械学会誌   81 - 85   2013.2

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  • Unexpected selection of growing dendrites by very-large-scale phase-field simulation Reviewed

    Tomohiro Takaki, Takashi Shimokawabe, Munekazu Ohno, Akinori Yamanaka, Takayuki Aoki

    Journal of Crystal Growth   382   21 - 25   2013

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    DOI: 10.1016/j.jcrysgro.2013.07.028

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  • Large-scale numerical weather prediction on GPU supercomputer: 145.0 TFlops with 3990 GPUs on TSUBAME 2.0 Reviewed

    Takayuki Aoki, Takashi Shimokawabe

    Lecture Notes in Earth System Sciences   ( 9783642164040 )   261 - 270   2013

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    DOI: 10.1007/978-3-642-16405-7_16

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  • Accelerating large-scale simulation of seismic wave propagation by multi-GPUs and three-dimensional domain decomposition Reviewed

    Taro Okamoto, Hiroshi Takenaka, Takeshi Nakamura, Takayuki Aoki

    Lecture Notes in Earth System Sciences   ( 9783642164040 )   375 - 389   2013

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    DOI: 10.1007/978-3-642-16405-7_24

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  • ブロックAMR法のGPUコンピューティング・フレームワーク Reviewed

    下川辺隆史, 青木尊之, 小野寺直幸

    情報処理学会 HPCS 2012(ハイパフォーマンスコンピューティングと計算科学シンポジウム)   2013

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  • 格子ボルツマン法による1m格子を用いた都市部10km四方の大規模LES気流シミュレーション Reviewed

    小野寺直幸, 青木尊之, 下川辺隆史, 小林宏充

    情報処理学会 HPCS 2012(ハイパフォーマンスコンピューティングと計算科学シンポジウム)   2013

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  • Multiphase Field Simulation of Austenite-to-Ferrite Transformation Accelerated by GPU Computing

    YAMANAKA Akinori, TAKAKI Tomohiro, AOKI Takayuki, SHIMOKAWABE Takashi

    JCST   6 ( 3 )   182 - 197   2012

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    The multiphase field (MPF) method is recognized as a powerful numerical method to simulate microstructural evolutions, such as solidification, grain growth, recrystallization, and phase transformation, in various materials. However, because we need to solve the time evolution equations for multiple-order parameters derived from the total Gibbs free energy, MPF simulations are very computationally expensive. In this paper, we use a graphics processing unit (GPU) to accelerate the two-dimensional MPF simulation of austenite-to-ferrite transformation in a Fe-C alloy. This is an important phenomenon for predicting the morphology of multiphase microstructures in steel. To perform the MPF simulation on an NVIDIA GPU, the program code is developed in CUDA Fortran. Using this code, the acceleration performance of the GPU implementation is evaluated, and our results demonstrate that the GPU computation can powerfully accelerate the MPF simulation by introducing an active parameter tracking (APT) method, which is used to reduce the computational load and memory consumption. The performance of the GPU computation with APT achieves a speedup factor of 5 compared with the GPU computation without APT and a speedup factor of 15 compared with the basic CPU computation without the APT method.

    DOI: 10.1299/jcst.6.182

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  • Multi-GPU performance of incompressible flow computation by lattice Boltzmann method on GPU cluster Reviewed

    Wang Xian, Aoki Takayuki

    Parallel Computing   37 ( 9 )   521 - 535   2011.9

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    DOI: 10.1016/j.parco.2011.02.007

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  • GPU-accelerated phase-field simulation of dendritic solidification in a binary alloy Reviewed

    Akinori Yamanaka, Takayuki Aoki, Satoi Ogawa, Tomohiro Takaki

    Journal of Crystal Growth   318 ( 1 )   40 - 45   2011.3

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    DOI: 10.1016/j.jcrysgro.2010.10.096

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  • Peta-scale phase-field simulation for dendritic solidification on the TSUBAME 2.0 supercomputer. Reviewed

    Takashi Shimokawabe, Takayuki Aoki, Array, Toshio Endo, Akinori Yamanaka, Naoya Maruyama, Akira Nukada, Satoshi Matsuoka

    Conference on High Performance Computing Networking, Storage and Analysis, SC 2011, Seattle, WA, USA, November 12-18, 2011   3:1-3:11   2011

  • 145 TFlops performance on 3990 GPUs of TSUBAME 2.0 supercomputer for an operational weather prediction Reviewed

    Takashi Shimokawabe, Takayuki Aoki, Junichi Ishida, Kohei Kawano, Chiashi Muroi

    Procedia Computer Science   4   1535 - 1544   2011

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    DOI: 10.1016/j.procs.2011.04.166

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  • Large-Eddy Simulation of Turbulent Channel Flows with Conservative IDO Scheme Reviewed

    N. Onodera, T. Aoki, and H, Kobayashi

    Journal of Computational Physics   230 ( 14 )   2011

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    DOI: 10.1016/j.jcp.2011.04.004

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  • Numerical Simulation of Two-Phase Flow Driven by Rotating Object

    TAN Naruhiko, AOKI Takayuki, INOUE Keisuke, YOSHITANI Kiyofumi

    Transactions of the Japan Society of Mechanical Engineers Series C   77 ( 781 )   1699 - 1714   2011

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    Air-oil two-phase flows driven by a rotor with teeth are studied by a numerical simulation with an interface capturing Conservative Level Set method. The code has been developed on the rotating frame in cylindrical coordinate system. The experiments were also conducted and the snapshots of the oil distribution and the friction moment were compared with the numerical results. The pitch and the height of the tooth were taken as parameters to figure out the effect on gas-liquid interface profile and frictional moment. The behavior of the air-oil interface is in good agreement with the experiment at 100-rpm rotational speed. The detailed contribution of the pressure and the shear stress acting on the tooth surface is also understood. It is found that the numerical simulation is able to describe the two-phase flow very well at 100-rpm rotational speed and higher grid resolution is necessary in order to capture the phenomena at 500-rpm rotational speed.

    DOI: 10.1299/kikaib.77.1699

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  • GPUによるラージエディ・シミュレーションの高速化

    小野寺直幸, 青木尊之, 小林宏充

    日本流体力学会「ながれ」   29 ( 6 )   77   2010

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  • コンパクト差分を用いた高次精度マルチ・モーメント法の開発 Reviewed

    小野寺直幸, 青木尊之, 杉原健太

    日本計算工学講演会論文集   2010 ( 20100019 )   2010

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  • An 80-fold speedup, 15.0 TFlops GPU acceleration of non-hydrostatic weather model ASUCA production code Reviewed

    Takashi Shimokawabe, Takayuki Aoki, Chiashi Muroi, Junichi Ishida, Kohei Kawano, Toshio Endo, Akira Nukada, Naoya Maruyama, Satoshi Matsuoka

    2010 ACM/IEEE International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2010   2010

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    DOI: 10.1109/SC.2010.9

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  • GPU Acceleration for Computaion of Hyperbolic Equations(<Special Topics>GPGPU Computing)

    Aoki Takayuki

    Bulletin of the Japan Society for Industrial and Applied Mathematics   20 ( 2 )   94 - 106   2010

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    In order to solve hyperbolic equations such as electromagnetic wave equation, GPU(Graphics Processing Unit) is used as an accelerator. The characteristics of the physical phenomena modeled by hyperbolic equations make it easy to apply the GPU to highly-parallel thread computing, since explicit scheme is available for them. We demonstrate a compressible flow solving Euler equation with a higher-order numerical scheme IDO-CF and we achieved 54 GFlops on NVIDIA GeForce GTX 285. The multi-GPU computing for lattice Boltzmann method is carried out on the Tesla GPU of TSUBAME grid cluster of Tokyo Tech and the strong scaling is investigated up to 100GPUs. The shallow water equation for the real-time tsunami simulation is also solved on the multi-GPU and the overlapping technique between the communication and computation to hide the GPU-to-GPU communication time. The Tesla 10GPUs achieved the performance comparable with 1000 TBUBAME Opteron CPUs.

    DOI: 10.11540/bjsiam.20.2_94

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  • Accelerating large-scale simulation of seismic wave propagation by multi-GPUs and three-dimensional domain decomposition Reviewed

    Taro Okamoto, Hiroshi Takenaka, Takeshi Nakamura, Takayuki Aoki

    Earth, Planets and Space   62 ( 12 )   939 - 942   2010

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    DOI: 10.5047/eps.2010.11.009

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  • Special Issue of GPGPU Computing(<Special Topics>GPGPU Computing)

    Aoki Takayuki

    Bulletin of the Japan Society for Industrial and Applied Mathematics   20 ( 2 )   90 - 93   2010

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    DOI: 10.11540/bjsiam.20.2_90

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  • J0501-3-5 Numerical simulation of two-phase flow for a rotating object

    TAN Naruhiko, AOKI Takayuki

    The proceedings of the JSME annual meeting   2009   31 - 32   2009

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    In this study, level set method and conservative level set method had been implemented on rotational cylindrical coordinate system and applied to simulation of churning by a gear-shaped rotating object. As a result, it was found that conservative formulation was favorable for estimating the amount of splashed oil rather than non-conservative formulation such as level set method. Through the series of test cases, it was shown that the conservative level set method could be effective method to analyze the splashed oil by churning.

    DOI: 10.1299/jsmemecjo.2009.7.0_31

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  • 2206 Numerical Simulation of Moving Boundary Problem by Overset-Grid IDO Method

    OGAWA Satoi, AOKI Takayuki

    The proceedings of the JSME annual meeting   2006   89 - 90   2006

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    Overset-Grid Method is essential for simulation of moving boundary problem. In order to keep accurate interpolation at overlapping area, we adopt Interpolated Differential Operator scheme (IDO). That can solve Poisson equation with fourth-order accuracy. As the first step to simulate moving objects, we applied the method to the flow around stationary object.

    DOI: 10.1299/jsmemecjo.2006.1.0_89

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  • 127 Micro scale blood simulation in complex geometry by using particle method

    Fujita Sadao, Aoki Takayuki

    Proceedings of the JSME Bioengineering Conference and Seminar   2004   245 - 246   2005

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    DOI: 10.1299/jsmebs.2004.17.0_245

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  • Improvement of accuracy and stability in numerically solving hyperbolic equations by IDO (Interpolated Differential Operator) scheme with Runge-Kutta time integration Reviewed

    Hiroshi Yoshida, Takayuki Aoki, Takayuki Utsumi

    Electronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)   87 ( 2 )   33 - 42   2004.2

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    DOI: 10.1002/ecjc.10127

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  • CIP Method

    Aoki Takayuki

    Bulletin of the Japan Society for Industrial and Applied Mathematics   14 ( 4 )   400 - 401   2004

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    DOI: 10.11540/bjsiam.14.4_400

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  • Numerical simulation of shockwave by KrF laser ablation Reviewed

    Susumu Kato, Kaori Kato, Takayuki Aoki, Ryuichi Ishizaki, Osamu Tatebe, Isao Matsushima, Eiichi Takahashi, Yoshiro Owadano

    Proceedings of SPIE-The International Society for Optical Engineering   4424   260 - 263   2001

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    DOI: 10.1117/12.425608

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  • Simulation of recombination pumped aluminum soft X-ray laser Reviewed

    Chang-Jun Zhu, Tsuneyuki Ozaki, Satoshi Orimo, Teruto Kanai, Jia-Qi Liang, Hiroto Kuroda, Takayuki Aoki

    Progress in Crystal Growth and Characterization of Materials   33 ( 1-3 )   285 - 288   1996

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    DOI: 10.1016/0960-8974(96)83658-8

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  • The compact CIP (cubic-interpolated pseudo-particle) method as a general hyperbolic solver Reviewed

    Takashi Yabe, Takayuki Aoki, Gyo Sakaguchi, Pei-Yuan Wang, Takeo Ishikawa

    Computers and Fluids   19 ( 3-4 )   421 - 431   1991

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    DOI: 10.1016/0045-7930(91)90067-R

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  • Current neutralization of ion beam rotating and propagating in plasma Reviewed

    Takayuki Aoki, Keishiro Niu

    Laser and Particle Beams   5 ( 3 )   481 - 493   1987

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    DOI: 10.1017/S0263034600002974

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▼display all

Books

  • はじめてのCUDAプログラミング

    工学社  2009  ( ISBN:9784777514779

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  • 計算力学ハンドブック(CIP法)

    朝倉書店  2007  ( ISBN:9784254231120

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  • Direct 3D Simulation for Falling Leaves

    Comput. Fluid Dynamics 2000, N.Satofuka ed. Springer  2000 

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  • 物理学大辞典(分担訳)

    丸善  1999 

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MISC

  • 共回転有限要素法と格子ボルツマン法による流体構造連成解析手法の開発—Fluid-structure Interaction Analysis using Co-rotational Finite Element Method and Lattice Boltzmann Method

    平山 大悟, 下畑 和希, 野村 怜佳, 渡辺 勢也, 森口 周二, 青木 尊之, 寺田 賢二郎

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   30   408 - 411   2025.6

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    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I034166198

  • 流体構造連成解析に向けた共回転定式化とレベルセット法

    平山大悟, 野村怜佳, 森口周二, 青木尊之, 寺田賢二郎

    土木学会全国大会年次学術講演会(Web)   79th   2024

  • Implementing PLIC-HF Method into Gas-Liquid Two-Phase Flow Simulation based on Momentum-Conserved Weakly Compressible Scheme with Adaptive Mesh Refinement

    内田遥己, 青木尊之, 松下真太郎

    計算工学講演会論文集(CD-ROM)   29   2024

  • 適合細分化格子ボルツマン法による大気境界層生成のためのパラメータ最適化—Parameter optimization for generating atmospheric boundary layers by using the locally mesh-refined lattice Boltzmann method

    小野寺 直幸, 井戸村 泰宏, 長谷川 雄太, 下川辺 隆史, 青木 尊之

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   27   784 - 787   2022.6

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  • Direct numerical simulation of nucleate boiling using PLIC-VOF method

    三好健斗, 長崎孝夫, 青木尊之, YANG Kai, 松下真太郎, 杉原健太

    数値流体力学シンポジウム講演論文集(CD-ROM)   36th   2022

  • ブロック型適合細分化格子でのPoisson解法の混合精度演算による高速化—Acceleration of locally mesh allocated Poisson solver using mixed precision

    小野寺 直幸, 井戸村 泰宏, 長谷川 雄太, 下川辺 隆史, 青木 尊之

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   26   749 - 751   2021.6

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  • 界面に適合するAMR法を用いた弱圧縮性解法の複数GPUによるオイルジェット計算—A Numerical Simulation of Two-phase Oil-jet with Interface-adapted AMR Method using Multi-GPUs

    松下 真太郎, 青木 尊之

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   26   764 - 769   2021.6

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    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I031500280

  • Development of detailed two-phase flow solver on block-structured grids

    小野寺直幸, 井戸村泰宏, 長谷川雄太, 山下晋, 下川辺隆史, 青木尊之

    日本原子力学会春の年会予稿集(CD-ROM)   2021   2021

  • Permeability prediction of liquid flow in equiaxed dendritic structures by phase-field and lattice Boltzmann methods

    高木知弘, 坂根慎治, 光山容正, 大野宗一, 澁田靖, 青木尊之

    材料とプロセス(CD-ROM)   34 ( 1 )   2021

  • A Simulation of Water Strider Swimming on Water Surface using AMR method

    吉泉瑛, 青木尊之, 松下真太郎, 杉原健太

    数値流体力学シンポジウム講演論文集(CD-ROM)   35th   2021

  • A Numerical Simulation of Water Strider Swimming on Water Surface using AMR Method

    吉泉瑛, 青木尊之, 松下慎太郎

    計算工学講演会論文集(CD-ROM)   26   2021

  • Instructions for Preparation of Manuscripts for The Proceedings of Computational Engineering Conference of JSCES

    青木律也, 青木尊之, 松下真太郎, KAI Yang

    計算工学講演会論文集(CD-ROM)   26   2021

  • A Numerical Simulation of Two-phase Oil-jet with Interface-adapted AMR Method using Multi-GPUs

    松下真太郎, 青木尊之

    計算工学講演会論文集(CD-ROM)   26   2021

  • The Simulation of Liquid-Film Forming with Consideration of Marangoni Effect by using Interface-Adapted AMR method and Weakly Compressible Scheme

    25   6p   2020.6

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  • Performance Study of Dynamic Load Balancing Using Multi-phase-field Method for AMR Applications of Gas-Liquid Two-Phase Flows

    25   6p   2020.6

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  • GPU-acceleration of locally mesh allocated Poisson solver

    25   4p   2020.6

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  • Performance evaluation of block-structured Poisson solver on GPU, CPU, and ARM processors

    小野寺直幸, 井戸村泰宏, 朝比祐一, 長谷川雄太, 下川辺隆史, 青木尊之

    数値流体力学シンポジウム講演論文集(CD-ROM)   34th   2020

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    25 ( 2 )   4070 - 4073   2020

  • 木構造に基づいたAMR法を用いた流束項付き保存形フェーズフィールド方程式のマルチモーメント法による解法~木構造に基づいたAMR法を用いた保存形フェーズフィールド法のマルチモーメント法による界面捕獲と気液二相流計算への適用

    松下真太郎, 青木尊之

    計算工学   25 ( 2 )   2020

  • Multi-GPU Implementation using Dynamic Domain Decomposition for a Gas-Liquid Two-Phase Flow Simulation with AMR Method

    松下真太郎, 青木尊之, 青木律也, YANG Kai

    数値流体力学シンポジウム講演論文集(CD-ROM)   34th   2020

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    青木尊之, 松下真太郎

    トライボロジスト   65 ( 11 )   2020

  • AMR法を適用したphase-fieldデンドライト凝固計算の複数GPU並列化—Multi-GPUs parallelization for phase-field simulations of dendrite growth applying an adaptive mesh refinement method

    坂根 慎治, 高木 知弘, 大野 宗一, 澁田 靖, 青木 尊之

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   24   4p   2019.5

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  • High-Resolution Simulation of Gas-Liquid Two-Phase Flows using Weakly Compressible Scheme based on Isothemal Navier-Stokes Equation with Interface-Adapted AMR Method

    24   6p   2019.5

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  • A GPU-based Simulation for Formation and Collapse of Liquid Film using Interface-adapted AMR Method

    38 ( 2 )   93 - 96   2019.4

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  • Aerodynamics Simulation on Bicycle Racing by Multi-GPU Computing with Mesh-refined LBM

    38 ( 2 )   97 - 100   2019.4

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  • Large-scale multi-phase-field simulation of grain growth with anisotropic grain boundary properties

    三好英輔, 高木知弘, 大野宗一, 澁田靖, 坂根慎治, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   32nd   2019

  • Multi-GPUs parallel computation for AMR phase-field simulation of dendrite growth with liquid flow and solid motion

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   32nd   2019

  • 多結晶粒成長における粒界物性の方位差依存性の影響:大規模phase-fieldシミュレーションによる解析

    三好英輔, 高木知弘, 大野宗一, 澁田靖, 坂根慎治, 青木尊之

    日本材料学会学術講演会講演論文集   68th   2019

  • 動的接触角を考慮した斜面を流れ落ちる液滴のシミュレーション

    菊田大輔, 青木尊之, 松下真太郎

    数値流体力学シンポジウム講演論文集(CD-ROM)   33rd   2019

  • 等軸晶形成のphase-fieldモデリングと2次元大規模シミュレーション

    高木知弘, 坂根慎治, 佐藤遼太郎, 大野宗一, 澁田靖, 青木尊之

    材料とプロセス(CD-ROM)   32 ( 1 )   2019

  • Effects of material properties and particle shape characteristics on repose angle

    奥山 大輝, 橘 一光, 寺田 賢二郎, 森口 周二, 青木 尊之

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   23   2018.6

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  • A Three-dimensional Two-phase Flow Simulation using a Full-Explicit Scheme based on Weakly Compressible Assumption with Interface-adapted AMR Method

    23   6p   2018.6

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  • 熱溶質対流を伴う二元合金凝固phase-fieldシミュレーションの複数GPU並列化—Multi-GPUs parallelization of phase-field simulation during binary alloy solidification with thermal-solutal convection

    坂根 慎治, 高木 知弘, 大野 宗一, 澁田 靖, 青木 尊之

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会 編   23   4p   2018.6

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  • 界面に適合するAMR法と完全陽解法を用いた液膜形成と崩壊のGPU計算

    松下真太郎, 青木尊之

    数値流体力学シンポジウム講演論文集(CD-ROM)   32nd   2018

  • A Simulation of the Formation and Collapse of the Liquid Film with Interface-adapted AMR Method

    松下真太郎, 青木尊之

    混相流シンポジウム講演論文集(Web)   2018   2018

  • Phase-field法と格子ボルツマン法による柱状デンドライト垂直流れの透過率評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 青木尊之

    材料とプロセス(CD-ROM)   31 ( 2 )   2018

  • 大規模phase-field計算による多結晶二元合金一方向凝固過程の競合成長挙動評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 青木尊之

    材料とプロセス(CD-ROM)   31 ( 1 )   2018

  • Large-scale simulations using particle and mesh methods on a GPU supercomputer

    ( 2037 )   1 - 4   2017.7

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  • A Fluidized Bed Simulation with Non-spherical Particles Based on Direct Calculation of Fluid-solid Interactions

    22   5p   2017.5

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  • Phase-field Simulation during Directional Solidification of Binary Alloy with Natural Convection

    22   4p   2017.5

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  • Grain-growth behavior in 2D cross sections analyzed by large-scale 3D multi-phase-field simulations

    22   3p   2017.5

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  • Numerical analysis on non-linear characteristic of permeability coefficient of geomaterial using fluid-particle-coupled simulation

    橘 一光, 森口 周二, 高瀬 慎介, 寺田 賢二郎, 青木 尊之, 神谷 浩二, 小高 猛司

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   22   4p   2017.5

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  • A Gas-liquid Two-phase Flow Simulation based on Fully Explicit Method with Multi-GPU

    22   6p   2017.5

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  • Development of an AMR framework to realize effective high-resolution simulations

    22   4p   2017.5

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  • A Large-scale Simulation of Lattice Boltzmann Method with Adaptive Mesh Using Multiple GPUs

    22   5p   2017.5

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  • Numerical Analysis for Free-swimming of a Dolphin by Lattice Boltzmann Method

    22   5p   2017.5

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  • 3D大規模Phase-field格子ボルツマン計算によるデンドライト一方向凝固組織に及ぼす自然対流の影響評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   30 ( 2 )   2017

  • 大規模phase-fieldシミュレーションの現状

    高木知弘, 大野宗一, 澁田靖, 坂根慎治, 三好英輔, 下川辺隆史, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   30th   2017

  • 断面観察からの立体的結晶粒組織の推定に関するPhase-Field法による研究

    三好英輔, 高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   30 ( 2 )   2017

  • Phase-field格子ボルツマン計算によるデンドライト一方向凝固組織に及ぼす自然対流の影響評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   30 ( 1 )   2017

  • デンドライトの成長と運動の大規模phase-fieldシミュレーション

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    数値流体力学シンポジウム講演論文集(CD-ROM)   31st   2017

  • Numerical Simulations of Free Surface Flow Interacting with Solid Particles

    渡辺勢也, 青木尊之, 長谷川雄太, 松下真太郎

    混相流シンポジウム講演論文集(CD-ROM)   2017   2017

  • 界面に適合するAMR法を用いた気液二相流の完全陽解法計算

    松下真太郎, 青木尊之

    数値流体力学シンポジウム講演論文集(CD-ROM)   31st   2017

  • A Two-phase Flow Simulation using GPU computing with Fully Explicit Scheme on Weakly Compressible Flow Assumption

    松下真太郎, 青木尊之

    混相流シンポジウム講演論文集(CD-ROM)   2017   2017

  • Projects for Partnership Resource Allocations at TSUBAME2

    Toshio Watanabe, Atsushi Sasaki, Yutaka Matsumoto, Yuki Itakura, Takayuki Aoki

    FA26   2016.12

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  • Development and Performance Evaluation of GPU-computing Framework to Realize Extremely Large-scale Stencil Computations Beyond Device Memory Capacity

    21   5p   2016.5

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  • A GPU implementation for high performance stencil calculations on an adaptively refined mesh

    21   6p   2016.5

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  • Simulation for Falling Ginkgo Leaves

    21   6p   2016.5

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  • A multi-GPU implementation of Lattice Boltzmann Method with Adaptive Mesh Refinement

    21   5p   2016.5

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  • A simulation of a real-scale sediment flow experiment using DEM

    21   4p   2016.5

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  • Development of permeability prediction method using phase-field and lattice Boltzmann methods

    21   4p   2016.5

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  • GPUスパコンを用いた格子ボルツマン法/有限体積法/粒子法による大規模流体シミュレーション(特別講演2)

    青木 尊之

    バイオエンジニアリング講演会講演論文集   2016 ( 28 )   A1   2016.1

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  • Phase-field法と格子ボルツマン法の大規模計算によるデンドライト凝固組織の透過率評価法の構築

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   29 ( 2 )   2016

  • 大規模multi-phase-field計算に基づく理想粒成長過程の考察

    三好英輔, 高木知弘, 坂根慎治, 大野宗一, 澁田靖, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   29th   2016

  • デンドライト沈降現象のphase-field格子ボルツマンシミュレーション

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   29th   2016

  • 個別要素法による土砂流動解析の計算条件に関する一考察

    森口周二, 太田勇真, 高瀬慎介, 寺田堅二郎, 阿部慶太, 青木尊之

    土木学会年次学術講演会講演概要集(CD-ROM)   71st   2016

  • 大規模phase-field計算による単結晶二元合金一方向凝固過程の一次枝配列挙動評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   29 ( 1 )   2016

  • Study on Interface-Tracking with Phase-Field Method base on Conservative IDO scheme

    MATSUSHITA Shintaro, AOKI Takayuki, TAKAKI Tomohiro, AIHARA Shintaro

    The Proceedings of The Computational Mechanics Conference   2016 ( 0 )   89 - 89   2016

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  • 弱圧縮性流体解析手法による気液二相流解析

    松下真太郎, 青木尊之

    数値流体力学シンポジウム講演論文集(CD-ROM)   30th   2016

  • 298 Large Eddy Simulation of a Flow around a Complex Shape Body by Lattice Boltzmann Method using

    HASEGAWA Yuta, AOKI Takayuki

    The Computational Mechanics Conference   2015 ( 28 )   "298 - 1"-"298-3"   2015.10

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  • 241 Large-scale phase-field lattice Boltzmann simulations of dendrite growth with melt convection

    Takaki Tomohiro, Sakane Shinji, Rojas Roberto, Ohno Munekazu, Yasushi, Shimokawabe Takashi, Aoki Takayuki

    The Computational Mechanics Conference   2015 ( 28 )   "241 - 1"-"241-2"   2015.10

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  • 260 A Large-scale DEM Simulation using Realistic Shapes of Granular Particles on GPU

    WATANABE Seiya, AOKI Takayuki, TSUZUKI Satori

    The Computational Mechanics Conference   2015 ( 28 )   "260 - 1"-"260-2"   2015.10

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  • A GPU Implementation of Mesh Adaptation for Lattice Boltzmann Method

    20   5p   2015.6

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  • A gas-liquid two-phase flow simulation with multi-GPU

    20   6p   2015.6

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  • Study of the GPU Performance Depending on Neighbor-particle Searching for DEM Simulations

    20   6p   2015.6

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  • A Large-scale Particle-Based Simulation for Fluid-Structure Interaction using Dynamic Load Balance on a GPU Supercomputer

    20   5p   2015.6

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  • Advancement of High-productivity GPU-Computing Framework for Stencil Applications

    20   5p   2015.6

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  • A Large-scale Suspension-flow Simulation directly solving fluid-structure interactions with Dynamic Load Balance on a GPU Supercomputer Reviewed

    2015   111 - 119   2015.5

  • 027 Three-dimensional Multi-phase-field Simulation of Polycrystalline Grain Growth with Mobile Particle Pinning

    OKAMOTO Masashi, YAMANAKA Akinori, SHIMOKAWABE Takashi, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2015 ( 0 )   _027 - 1_-_027-2_   2015

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  • 多結晶粒成長過程における析出物によるピンニングの大規模マルチフェーズフィールドシミュレーション

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    計算工学講演会論文集(CD-ROM)   20   2015

  • 自動チューニング機構の導入によるステンシル計算のためのGPUコンピューティング・フレームワークの高度化

    下川辺隆史, 青木尊之, 小野寺直幸

    日本応用数理学会年会講演予稿集(CD-ROM)   2015   2015

  • 二結晶二元合金におけるデンドライト競合成長の大規模3D phase-fieldシミュレーション

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    材料とプロセス(CD-ROM)   28 ( 2 )   2015

  • 可動分散粒子によるピンニングを考慮した多結晶粒成長の3次元マルチフェーズフィールドシミュレーション

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   28th   2015

  • 「TSUBAME」を用いた格子ボルツマン法による大規模ラージエディ・シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史

    CCSE Workshop   26th   2015

  • フォトニック結晶共振器解析へのFDTDの応用とGPGPUによる高速化

    谷山秀昭, 谷山秀昭, 下川辺隆史, 青木尊之, 納富雅也, 納富雅也

    電子情報通信学会論文誌 C(Web)   J98-C ( 5 )   2015

  • Phase-field格子ボルツマン法による対流内でのデンドライト成長の大規模3D計算

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    計算工学講演会論文集(CD-ROM)   20   2015

  • 液相流動を伴うデンドライト成長の大規模phase-field lattice Boltzmannシミュレーション

    高木知弘, 坂根慎治, ROJAS Roberto, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   28th   2015

  • GPUによる近接相互作用に基づく粒子計算の近傍探索手法

    渡辺 勢也, 青木 尊之, 都築 怜理, 下川辺 隆史

    研究報告計算機アーキテクチャ(ARC)   2014 ( 24 )   1 - 9   2014.12

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    近接相互作用に基づく粒子法の一つである個別要素法の GPU での計算に,近傍粒子探索手法である粒子登録法とセル分割法 (リンクリストを用いた方法とハッシュを用いた方法) を実装し,各手法の違いによる計算時間およびメモリ使用量の比較を行う.さらに,粒子登録法とリンクリストを用いたセル分割法のハイブリット手法および粒子登録法とハッシュを用いたハイブリット手法を実装し高速化を行った.近傍探索手法を比較する例題として,100 万個の粒子を用いた 3 次元個別要素法によるダム崩壊問題をそれぞれの近傍探索手法で行った.粒子登録法とリンクリストを用いたセル分割法のハイブリット手法が実装した 5 つの近傍探索手法のなかで最も計算を高速に行えることがわかった.これは,周囲のセルに含まれる粒子を参照するのがハッシュ法よりも速いリンクリストを用いたことと,粒子登録法により相互作用計算で影響半径外の粒子との無駄な計算を極力減らしたためである.メモリ使用量はハッシュ法が最も少なく,使用できるメモリ量が限られている GPU の場合はハッシュ法を用いればよいことがわかった.また,粒子の物理量のデータ構造による計算時間への影響について検討を行い,粒子データを Structure Of Array とすると,Array Of Structure とした場合と比べ,計算時間を短縮できることを確認した.

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  • ステンシル計算のためのGPUコンピューティング・フレームワークのチューニング高度化

    下川辺 隆史, 青木 尊之, 小野寺 直幸

    研究報告ハイパフォーマンスコンピューティング(HPC)   2014 ( 25 )   1 - 6   2014.12

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    格子に基づいたシミュレーションは高性能計算分野において重要なアプリケーションである.本研究では,GPU による格子に基づいたシミュレーションを簡便に記述し,高い生産性で開発することを可能とする GPU コンピューティング・フレームワークを開発する.フレームワークは C++ 言語のテンプレートで実装され,高い可搬性を実現している.GPU による格子計算では,その性能は計算に用いるスレッド数などの実行時パラメータに大きく依存する.実行時に最適なパラメータを自動選択する機構をフレームワークに導入し,その性能について評価する.

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  • Large-scale particle-based fluid simulations using dynamic load balance on GPU supercomputer

    Tsuzuki Satori, Aoki Takayuki

    The Computational Mechanics Conference   2014 ( 27 )   674 - 676   2014.11

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  • Large-scale fluid-structure interaction simulation of turbulent flows around a Ping-Pong ball

    Onodera Naoyuki, Aoki Takayuki, Izumida Keita

    The Computational Mechanics Conference   2014 ( 27 )   389 - 390   2014.11

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  • Large-scale DEM Simulations for Granular Dynamics

    Tsubame ESJ. : e-science journal   13   29 - 34   2014.11

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  • 0304 Large-eddy simulation of fluid-structure interaction using lattice Boltzmann method on the TSUBAME supercomputer : Motion of the ping-pong ball in table tennis

    ONODERA Naoyuki, AOKI Takayuki, IZUMIDA Keita

    Fluids engineering conference ...   2014   "0304 - 1"-"0304-2"   2014.10

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    Motion of a spinning ping-pong ball is strongly affected by the Magnus effect. Since airflows around a ping-pong ball, such as Smash, are turbulent with a high Reynolds number, it is necessary to carry out large scale CFD simulations. We have developed a large-eddy simulation code based on lattice Boltzmann method for GPU supercomputers. Coherent-structure Smagorinsky model is applied to turbulent phenomena, and is suitable for large-scale calculation. Our code achieved fairly good performance by using the TSUBAME supercomputer. In this research, we examine a large-eddy simulation for a motion of the ping-pong ball in table tennis. By executing this large-scale computation, details of airflows around the ping-pong ball were revealed.

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  • Large-Eddy Simulation of Turbulent Flows around a Ping-Pong Ball using Lattice Boltzmann Method on Multi-GPU cluster

    小野寺 直幸, 青木 尊之, 下川辺 隆史

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   19   4p   2014.6

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  • Large-scale particle simulations applied to practical problems on a GPU supercomputer

    19   5p   2014.6

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  • Weather Prediction Code based on a High-productivity Framework for Multi-GPU Computation

    下川辺 隆史, 青木 尊之, 小野寺 直幸

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   19   5p   2014.6

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  • 複数GPUによるデンドライト競合成長過程の3次元phase-fieldシミュレーション

    高木知弘, 大野宗一, 下川辺隆史, 青木尊之

    計算工学講演会論文集(CD-ROM)   19   2014

  • Phase-field simulations of dendritic directional solidification by GPU supercomputer TSUBAME2.5

    Takaki Tomohiro, Ohno Munekazu, Shimokawabe Takashi, Aoki Takayuki

    The Proceedings of The Computational Mechanics Conference   2014 ( 0 )   583 - 584   2014

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  • GPUスパコンを用いたフェライト変態の大規模マルチフェーズフィールドシミュレーション

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    計算工学講演会論文集(CD-ROM)   19   2014

  • Scalability model for multi-GPU computation of stencil applications using regular structured meshes with explicit time integration

    2013 ( 6 )   1 - 9   2013.12

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  • Scalability model for multi-GPU computation of stencil applications using regular structured meshes with explicit time integration

    2013 ( 6 )   1 - 9   2013.12

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  • 807 Large-scale 3D MHD simulation on GPU-rich supercomputer TSUBAME

    WONG Un-Hong, AOKI Takayuki, WONG Hon-Cheng

    The Computational Mechanics Conference   2013 ( 26 )   "807 - 1"-"807-3"   2013.11

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  • 1216 Large-scale agitation simulation based on Distinct Element Method on GPU supercomputer

    TSUZUKI Satori, AOKI Takayuki

    The Computational Mechanics Conference   2013 ( 26 )   "1216 - 1"-"1216-3"   2013.11

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    For large-scale granular simulations based on Distinct Element Method (DEM), a simulation code has been developed for GPU supercomputers equipped with GPUs. We propose an effective method for dynamic load balance among the decomposed domain assigned to each GPU. Applying the slice-grid method, we maintain the equal number of particles in the domain. Several techniques for particle counting and data movement between GPUs are implemented. The frequency of the memory de-fragmentation on GPU is examined from the view point of the cost of the data communication between CPU and GPU. A link-list technique of the neighbor particles list is introduced to save the memory drastically. The granular simulation works well with the dynamic load balance and good scalability has been achieved with increase of GPUs. The sand behavior of golf bunker shot is demonstrated with over 130 million particles using 256 GPUs. An agitation simulation using billion particles is also carried out on TSUBAME 2.0 at GSIC, Tokyo Tech.

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  • Large-scale LES Wind Simulation using Lattice Boltzmann Method for a 10km×10km Area in Metropolitan Tokyo

    小野寺 直幸, 青木 尊之, 下川辺 隆史

    Tsubame ESJ. : e-science journal   9   2 - 7   2013.9

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  • A Large-scale LES Wind Simulation using Lattice Boltzmann Method for a 10km × 10km Area in Tokyo on the TSUBAME 2.0 Supercomputer

    小野寺 直幸, 青木 尊之, 下川辺 隆史

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   18   4p   2013.6

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  • Large-scale DEM simulation using 100 million particles

    都築 怜理, 青木 尊之, 下川辺 隆史

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   18   4p   2013.6

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  • Performances of compressible-fluid computation for latest many-core processors : A comparision between GPU and MIC

    18   4p   2013.6

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  • Numerical Simulation of Two-Phase Flow with Moving Boundaries on Multi-GPU clusters

    18   4p   2013.6

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  • Dynamic load balance for large-scale particle simulation on GPU supercomputer

    都築 怜理, 青木 尊之, 下川辺 隆史

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   18   4p   2013.6

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  • Invited Talk : Simulation of photonic crystal cavities : FDTD method and its acceleration by GPU

    TANIYAMA Hideaki, SHIMOKAWABE Takashi, AOKI Takayuki, SUMIKURA Hisashi, NOTOMI Masaya

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 26 )   33 - 37   2013.5

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    The FDTD method has become a powerful tool in designing and analyzing photonic crystal structures. We describe the application of the FDTD method for optomechanical systems and for a two-level system in photonic crystal cavities. In addition, we also report on attempts to acceleration of the FDTD calculation using the GPU.

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  • Report on 18^<th> Visualization Conference

    AOKI Takayuki

    33 ( 129 )   33 - 34   2013.4

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  • 多結晶粒成長の大規模マルチフェーズフィールドシミュレーション~GPUスパコンTSUBAME2.0への実装~

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    日本機械学会計算力学講演会論文集(CD-ROM)   26th   2013

  • 808 A High-productivity Framework for Weather Prediction Code on GPU Computing

    SHIMOKAWABE Takashi, AOKI Takayuki, ONODERA Naoyuki

    The Proceedings of The Computational Mechanics Conference   2013 ( 0 )   _808 - 1_-_808-3_   2013

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  • 1614 Phase-field simulations of dendrite selection by GPU supercomputer TSUBAME

    Takaki Tomohiro, Shimokawabe Takashi, Ohno Munekazu, Yamanaka Akinori, Aoki Takayuki

    The Proceedings of The Computational Mechanics Conference   2013 ( 0 )   _1614 - 1_-_1614-2_   2013

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  • Multiple-GPU Computing of Polycrystalline Grain Growth Simulation using Multi-Phase-Field Method

    OKAMOTO Masashi, YAMANAKA Akinori, SHIMOKAWABE Takashi, AOKI Takayuki

    Transactions of JSCES   2013 ( 0 )   20130018 - 20130018   2013

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    The multi-phase-field method is one of the most powerful numerical simulation methods to study microstructure evolutions in practical polycrystalline materials. However, the computational cost for the multi-phase-field simulation is much higher than the conventional phase-field simulation, since the same number of time-evolution equations with multiple phase-field variables must be solved. In this study, a multiple-GPU computing technique using a programming language CUDA and the MPI library is newly developed to accelerate the multi-phase-field simulation. In order to hide communicational time for CPU-to-CPU and CPU-to-GPU communications, we propose an original overlapping method between computation and communication. Furthermore, we decompose whole computational domain into sub-domains to distribute computational load to multiple GPUs. The multi-phase-field computation for each sub-domain are efficiently performed by using multiple stream executions in CUDA. The three-dimensional grain growth simulation performed using our multiple-GPU computing technique with the overlapping method demonstrates that the communicational time can be hidden completely and good weak and strong scalings are achieved.

    DOI: 10.11421/jsces.2013.20130018

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  • 気象計算コードのためのGPUコンピューティング・フレームワーク

    下川辺隆史, 青木尊之, 小野寺直幸

    日本機械学会計算力学講演会論文集(CD-ROM)   26th   2013

  • GPUを用いた格子ボルツマン法による流体構造連成のラージエディ・シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史

    日本機械学会計算力学講演会論文集(CD-ROM)   26th   2013

  • 805 Large-scale Multi-Phase-Field Simulation of Grain Growth in Polycrystals : Implementation on TSUBAME 2.0 GPU Supercomputer

    OKAMOTO Masashi, YAMANAKA Akinori, SHIMOKAWABE Takashi, AOKI Takayuki

    The Proceedings of The Computational Mechanics Conference   2013 ( 0 )   _805 - 1_-_805-3_   2013

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  • 806 Large-Eddy Simulation of Fluid-Structure Interaction using Lattice Boltzmann Method on GPU cluster

    ONODERA Naoyuki, AOKI Takayuki, SHIMOKAWABE Takashi

    The Proceedings of The Computational Mechanics Conference   2013 ( 0 )   _806 - 1_-_806-3_   2013

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  • 近接相互作用に基づく大規模粒子計算(個別要素法)における効率的な動的負荷分散手法の提案とGPUスパコンでの実装

    都築怜理, 青木尊之, 下川辺隆史

    日本応用数理学会年会講演予稿集(CD-ROM)   2013   2013

  • TSUBAMEのGPUを用いた格子ボルツマン法による東京都心部の大規模気流シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史, 宮下達治

    数値流体力学シンポジウム講演論文集(CD-ROM)   27th   2013

  • 1304 Coherent structure sub-grid scale model for GPU-based Lattice Boltzmann method

    ONODERA Naoyuki, AOKI Takayuki, KOBAYASHI Hiromichi

    The Computational Mechanics Conference   2012 ( 25 )   678 - 679   2012.10

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  • 1105 A Large-scale GPU Simulation for Dendritic Solidification of Al-Si Binary Alloy

    Aoki Takayuki

    The Computational Mechanics Conference   2012 ( 25 )   55 - 57   2012.10

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  • 1805 Dynamic load balance of multi-GPU computation for large scale particles

    The Computational Mechanics Conference   2012 ( 25 )   270 - 272   2012.10

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  • 1804 Local mesh refinement for large eddy simulation with GPU clusters

    ONODERA Naoyuki, AOKI Takayuki

    The Computational Mechanics Conference   2012 ( 25 )   268 - 269   2012.10

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  • CS-4-1 Large-scale GPU computing Suitable for Studies on Fluid Dynamics and Electromagnetic Wave Propagation

    Aoki Takayuki, Shimokawabe Takashi, Onodera Naoyuki

    Proceedings of the Society Conference of IEICE   2012 ( 1 )   "S - 47"-"S-48"   2012.8

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  • 2 petaflops phase-field simulation for dendritic solidification on GPU-rich supercomputer TSUBAME 2.0

    下川辺 隆史, 青木 尊之, 高木 知弘

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science   17   4p   2012.5

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  • Large-scale GPU Computing for Passive Scalar Particles

    17   4p   2012.5

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  • Report on 17th Visualization Conference

    AOKI Takayuki

    32 ( 125 )   85 - 86   2012.4

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  • Dynamic load balance and strong scaling of Multi-GPU computation for passive scalar particles

    都築 怜理, 青木 尊之, 下川辺 隆史, 王 嫻

    研究報告ハイパフォーマンスコンピューティング(HPC)   2012 ( 37 )   1 - 10   2012.3

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    GPU による超大規模流体計算の速度場に対し、数千万~数億個に及ぶ粒子を移動させてスカラー量の分布を把握するため、パッシブスカラー粒子計算を GPU で高速に行う方法を提案する。GPU 間の通信や、粒子の移動により生じるメモリ使用量の増加、負荷分散の悪化が大幅な性能の低下の原因となる。移動する粒子のみを選択的に通信することで、GPU 間のデータ転送量を最小限に抑え、粒子番号の再整列によりメモリ使用量を抑える。さらに動的負荷分散を行うことで負荷を均等に分散させて、高速に計算する実装を構築する。性能評価は、GPU を 4224 台搭載したスパコン TSUBAME 2.0 を用いて行う。Particle tracing is an effective method on mesh-based applications in computational fluid dynamics (CFD). Graphics processing units (GPUs) make it possible to carry out the computation of billion passive-scalar particles on the velocity field. Data transfer among GPUs is a big overhead. Defragmentation of GPU memory in the time step and imbalance of particle distribution also reduce the performance. In this study, we present an effective method to minimize the CPU-GPU communication and optimize the frequency of the renumbering by sorting. In addition, the load balance of the particle computation should be considered by dynamically changing the domain decomposition. The performance for weak and strong scaling are examined on the TSUBAME 2.0 supercomputer and it is found that our method greatly improves the strong and weak scalability for the problems with over billion particles.

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  • ACM Gordon Bell Prize : Special Achievements in Scalability and Time-to-Solution & SC'11 Technical Paper : Peta-scale Phase-Field Simulation for Dendritic Solidification on the TSUBAME 2.0 Supercomputer

    下川辺 隆史, 青木 尊之, 高木 知弘

    Tsubame ESJ. : e-science journal   5 ( 0 )   3 - 8   2012.2

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  • 一方向凝固デンドライト競合成長の大規模3D phase-fieldシミュレーション

    高木知弘, 下川辺隆史, 山中晃徳, 青木尊之

    材料とプロセス(CD-ROM)   25 ( 2 )   2012

  • Multiple-GPU Scalability of Phase-Field Simulation for Dendritic Solidification (Selected Papers of the Joint International Conference of Supercomputing in Nuclear Applications and Monte Carlo : SNA + MC 2010)

    Progress in nuclear science and technology   2   639 - 642   2011.10

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  • A Large-scale Two-phase Flow Simulation on GPU Supercomputer

    Tsubame ESJ. : e-science journal   4   6 - 10   2011.10

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  • Large-scale Numerical Simulation on GPU-rich Supercomputer

    AOKI Takayuki, SHIMOKAWABE Takashi

    シミュレーション   30 ( 3 )   163 - 172   2011.9

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  • W052001 GPUコンピューティングによる超大規模流体解析の高速演算([W05200](流体工学部門,計算力学部門企画),流体コードの高速演算と大規模モデルの取扱)

    青木 尊之, 佐々木 淳

    年次大会 : Mechanical Engineering Congress, Japan   2011   "W052001 - 1"-"W052001-4"   2011.9

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  • Multi-GPU computation for large eddy simulation in complex geometries

    16   4p   2011.5

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  • GPU computing for compressible flow simulation based on multi-moment scheme

    16   4p   2011.5

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  • Performance of Meso-scale Atmosphere model ASUCA on TSUBAME 2.0(<Special Review>Selected Researches in CFD24,Feature Articles of 24th CFD Symposium)

    SHIMOKAWABE Takashi, AOKI Takayuki, ISHIDA Junichi, KAWANO Kohei, MUROI Chiashi, Takashi SHIMOKAWABE, Takayuki AOKI, Junichi ISHIDA, Kohei KAWANO, Chiashi MUROI, Tokyo Institute of Technology, Tokyo Institute of Technology, Japan Meteorological Agency, Japan Meteorological Agency, Japan Meteorological Agency

    Nagare   30 ( 2 )   75 - 78   2011.4

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  • GPGPUによる3D-FDTD計算の高速化プログラミング

    谷山秀昭, 下川辺隆史, 青木尊之, 納富雅也

    応用物理学会学術講演会講演予稿集(CD-ROM)   72nd   2011

  • Multi-GPU computing for next-generation weather forecasting: 145.0 TFlops with 3990 GPUs on TSUBAME 2.0

    下川辺 隆史, 青木 尊之

    Tsubame ESJ.   2 ( 2 )   28 - 33   2010.11

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  • Large-scale Non-hydrostatic Weather Simulation on GPU Supercomputer

    AOKI Takayuki, SHIMOKAWABE Takashi

    Journal of the Japan Society for Computational Engineering and Science   15 ( 4 )   2403 - 2407   2010.10

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  • GPU computing for dendritic solidification based on phase-field model

    青木 尊之, 小川 慧, 山中 晃徳

    Tsubame ESJ.   1   19 - 22   2010.9

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  • Wind waves simulation by CIP finite volume method

    YAMASHITA Susumu, XIAO Feng, AOKI Takayuki, TAKAHASHI Keiko, Susumu YAMASHITA, Feng XIAO, Takayuki AOKI, Keiko TAKAHASHI, Tokyo Institute of Technology:Japan Atomic Energy Agency, Department of Energy Sciences Tokyo Institute of Technology, Global Scientific Information and Computing Center Tokyo Institute of Technology

    Nagare   29 ( 4 )   277 - 286   2010.8

  • 3・5 GPGPUについての研究動向(3.計算力学,<特集>機械工学年鑑)

    青木 尊之

    日本機械学會誌   113 ( 1101 )   591 - 591   2010.8

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  • Multi-GPU Scalability of Phase-Field Simulation for Phase Transition―5Tera Flop/s Performance on 40 GPUs

    小川 慧, 青木 尊之, 山中 晃徳

    情報処理学会論文誌コンピューティングシステム(ACS)   3 ( 2 )   67 - 75   2010.6

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    純金属のデンドライト凝固成長に対してフェーズフィールド法に基づいた Allen-Cahn 方程式と熱伝導方程式を連立させて GPU で計算し実行性能を検証した.離散化された式を CUDA でプログラミングすることにより時間発展の計算を行い,NVIDIA の GPU である Tesla S1070 の単一 GPU で 171GFLOPS (単精度計算) を達成した.さらに複数 GPU に対して領域分割による並列化を行い,東京工業大学の TSUBAME において実行性能のスケーラビリティーを調べた.各 GPU に直結したビデオメモリ間のデータ通信が必要となり,CPU 側にバッファ・メモリを用意して GPU とバッファ・メモリの間のデータ転送,複数ノードに分散したバッファ・メモリ間のデータ交換の 2 段階で通信を行った.GPU の演算性能に対して通信性能が低く,データ転送に必要な部分を先に計算することでデータ転送を開始し,同時に内部領域の計算を行うオーバーラップ計算を行った.これによりストロング・スケーリングの大幅な向上を図ることができ,1920×1920×1920 格子に対し 40GPU を用いて 5TFLOPS を達成した.計算時間と通信時間の内訳について各部分にかかる時間を詳細に測定し,通信時間の短縮方法を明らかにした.本研究により,大規模な HPC アプリケーションを複数 GPU で実行するための方向性を示すことができた.Multi-GPU computing is carried out for the dendritic solidification of a pure metal. The simulation code for the Allen-Cahn equation coupled with the thermal conduction equation is implemented to the CUDA code and runs on the NVIDIA Tesla GPU of TSUBAME grid cluster. The performance of 171 GFLOPS (Single precision) for single GPU has been achieved and 40GPUs have shown 5TFLOPS for the computational domain of 1920×1920×1920 mesh. For a large-scale multi-GPU computing, GPU-to-GPU communications become major time consuming and the overlapping technique between the communication and computation is introduced to hide the communication time. The strong scaling of the GPU number has been improved very much in the case that the computational time is longer than communication time. The breakdown of execution time is examined carefully and the critical issues for HPC application on multi-GPU platform become clear.

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  • THE SCALABILITY OF PHASE-TRANSFORMATION SIMULATION BY PHASE FIELD MODEL ON GPU CLUSTER

    小川 慧, 青木 尊之, 山中 晃徳

    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science   15 ( 1 )   145 - 148   2010.5

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  • Comparison on the performance of Lattice Boltzmann method solver executed on multi-node GPU cluster by multi-dimensional domain decompositions

    15 ( 1 )   141 - 144   2010.5

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  • A conservative form of IDO scheme for large-eddy simulation

    ONODERA Naoyuki, AOKI Takayuki, KOBAYASHI Hiromichi

    2010   275 - 275   2010

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    The resolution of a numerical scheme is one of the most important requirements to calculate turbulent flows. A conservative form of the interpolated differential operator (IDO-CF) scheme is a multi-moment Eulerian scheme in which point values and integrated average values are separately defined in one cell. It is unique that the volume averaged value is based on the exact finite volume formulation. For a large-eddy simulation (LES), we use the coherent structure model (CSM) in which the model coefficient is locally obtained by a coherent structure extracted from a second invariant of the velocity gradient tensor, and the model coefficient correctly satisfies asymptotic behaviors to walls. The IDO-CF scheme with the CSM gives better turbulent intensities than the conventional FDM with the same number of grid points. The turbulent statistics calculated by IDO-CF scheme are in good agreement with the DNS at Re_γ=180. It is found that the IDO-CF scheme is suitable for the turbulent flow computation and improves the turbulent statistics with compact stencils.

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  • メソスケール気象モデルASUCAのTSUBAME2.0での実行

    下川辺隆史, 青木尊之, 石田純一, 河野耕平, 室井ちあし

    数値流体力学シンポジウム講演論文集(CD-ROM)   24th   2010

  • 404 GPU acceleration for 3D-LBM incompressible-flow solver

    WANG Xian, AOKI Takayuki

    The Computational Mechanics Conference   2009 ( 22 )   741 - 742   2009.10

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    Computations of three-dimensional incompressible flows by lattice Boltzmann method were executed on GPU successfully. The explicit and linear characteristic of lattice Boltzmann equation makes it very suitable to be solved on GPU and there is no any troublesome handling in making numerical code. As examples, 3D lid-driven cavity flow and the flow past a sphere were simulated by LBM and executed on GPU. As a result, for both cases, about 80-time accelerations over CPU computation were obtained. The performance of LBM solver for 3D single-phased incompressible flow is about 40 GFLOPS and the data transfer rate is about 70 GB/s.

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  • 402 GPU performance for higher-order advection schemes

    SUGIHARA Kenta, AOKI Takayuki

    The Computational Mechanics Conference   2009 ( 22 )   737 - 738   2009.10

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  • 308 Development of Multi-Moment Compact Scheme

    ONODERA Naoyuki, AOKI Takayuki

    The Computational Mechanics Conference   2009 ( 22 )   498 - 499   2009.10

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  • 304 Numerical Simulation of Wind Driven Surface Waves by CIP Finite Volume Method

    YAMASHITA Susumu, AOKI Takayuki, XIAO Feng, TAKAHASHI Keiko

    The Computational Mechanics Conference   2009 ( 22 )   490 - 491   2009.10

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  • 408 GPU Computing for 3-D Phase Field Model on Multi-GPU cluster

    OGAWA Satoi, AOKI Takayuki

    The Computational Mechanics Conference   2009 ( 22 )   749 - 750   2009.10

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  • Application of GPGPU on the computation of incompressible fluid flows by lattice Boltzmann method

    Proceedings of the conference on computational engineering and science   14 ( 1 )   311 - 314   2009.5

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  • GPU computing for high-accurate compressible flow simulation using IDO-CF scheme

    Proceedings of the conference on computational engineering and science   14 ( 1 )   293 - 296   2009.5

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  • Remarkable Acceleration of CFD Applications by using GPU Computing(Feature Articles of 22^<nd> CFD Symposium)

    AOKI Takayuki, Takayuki AOKI, Global Scientific Information and Computing Center Tokyo Institute of Technology

    Journal of Japan Society of Fluid Mechanics   28 ( 2 )   89 - 97   2009.4

  • AP-1-5 Acceleration of HPC Applications by GPU Stream Processing

    Aoki Takayuki

    Proceedings of the IEICE General Conference   2009   "SS - 8"   2009.3

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  • GPUによるメソスケール気象モデルASUCAの高速化

    下川辺隆史, 青木尊之, 石田純一

    数値流体力学シンポジウム講演論文集(CD-ROM)   23rd   2009

  • 615 Turbulence Simulation of Passive Scalar with IDO Scheme

    Kobayashi Hiromichi, Aoki Takauki

    The Computational Mechanics Conference   2008 ( 21 )   273 - 274   2008.11

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  • 616 Large Eddy Simulation of Turbulent Channel Flow with Conservative IDO Scheme

    ONODERA Naoyuki, AOKI Takayuki, KOBAYASHI Hiromichi

    The Computational Mechanics Conference   2008 ( 21 )   275 - 276   2008.11

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  • 626 GPU Computing for Phase Separation by Solving 3-D Cahn-Hilliard Equation

    OGAWA Satoi, AOKI Takayuki

    The Computational Mechanics Conference   2008 ( 21 )   562 - 563   2008.11

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  • 617 High-Performance CFD Application by GPU Computing

    Aoki Takayuki, Ogawa Satoi

    The Computational Mechanics Conference   2008 ( 21 )   544 - 545   2008.11

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  • 621 GPU computing for high-accurate compressible flow simulation using IDO-CF scheme

    SUGIHARA Kenta, AOKI Takayuki

    The Computational Mechanics Conference   2008 ( 21 )   552 - 553   2008.11

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  • Iterative Solver using CUDA for Poisson Equation

    AOKI Takayuki, OGAWA Satoi

    Journal of the Visualization Society of Japan   28 ( 1 )   255 - 258   2008.7

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  • Acceleration by GPU computing for Simulation of Two-Stream Plasma Instability

    OGAWA Satoi, AOKI Takayuki

    Journal of the Visualization Society of Japan   28 ( 1 )   287 - 290   2008.7

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  • GPU ACCELERATION FOR SIMULATION OF TWO-STREAM INSTABILITY OF PLASMA USING CIP SHEME

    OGAWA Satoi, AOKI Takayuki

    Proceedings of the conference on computational engineering and science   13 ( 2 )   837 - 840   2008.5

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  • Numerical simulation for particle-fluid interaction including free surface flow

    MORIGUCHI Shuji, AOKI Takayuki

    Proceedings of the conference on computational engineering and science   13 ( 2 )   799 - 802   2008.5

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  • Acceleration of Point-Jacobi Poisson Solver by using GPU

    OGAWA SATOI, AOKI TAKAYUKI

    IPSJ SIG Notes   2008 ( 43 )   19 - 23   2008.5

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    The Poisson equation which is the major time consuming of CFD (Computational Fluid Dynamics) is solved on the GPU as a SIMD-type accelerator. The Riken (Himeno) benchmark problem uses the Point-Jacobi method to solve the Poisson equation and the performance of 30.6 GFLOPS is achieved when we use a nVIDIA GeForce 8800 Ultra card. The GPU code is described by CUDA and 4-GPU parallel computing scores 93.6 GFLOPS.

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    Other Link: http://id.nii.ac.jp/1001/00028693/

  • Numerical Simulation of Two-phase Flow for Cylindrical Geometry

    TAN Naruhiko, AOKI Takayuki

    2008   87 - 87   2008

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    Two-phase flow solver for cylindrical geometry was developed and applied to test cases. Level set method with volume correction was used to capture and track gas-liquid interface combined with CSF model. Two-phase flow stirred by a rotating cylinder was simulated and swirling flows in the liquid phase induced by the cylinder were calculated. As a result, the developed code was found to be effective to predict two-phase flow for cylindrical geometry.

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  • Complete Divergence-Free form of the conservative Multi-Moment scheme

    SUGIHARA Kenta, AOKI Takayuki

    2008   76 - 76   2008

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    The complete divergence-free form of the conservative multi-moment scheme for the incompressible flow is presented. The method satisfy the divergence-free condition for all of the multi-moments on discretized level. The accuracy of the poisson equation using the divergence-free discretization shows fourth-order accuracy for the scaled wavenumber.

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  • 308 Stability Analysis for the IDO-CF scheme

    SUGIHARA Kenta, AOKI Takayuki

    The Computational Mechanics Conference   2007 ( 20 )   593 - 594   2007.11

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  • 1303 Development of numerical method for liquefaction problem using Immersed boundary method

    MORIGUCHI Shuji, AOKI Takayuki

    The Computational Mechanics Conference   2007 ( 20 )   171 - 172   2007.11

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  • 307 Multi-moment Fluid Computation on G80-GPU by using IDO Scheme

    OGAWA Satoi, AOKI Takayuki

    The Computational Mechanics Conference   2007 ( 20 )   591 - 592   2007.11

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    The GPU, Graphics Processing Unit on the video board has the more powerful performance of computation and larger bandwidth than CPU. The GPU has the greater potential for efficiently computing the equation of fluid dynamics than CPU. G80-GPU produced by nVIDIA Corporation is the key of the next generation GPGPU. This paper describes the method and the problems of the computation using IDO Scheme on G80-GPU.

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  • Numerical simulation of vertical-axis wind turbine on overset grid using ido scheme

    Proceedings of the conference on computational engineering and science   12 ( 2 )   891 - 894   2007.5

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  • T11 Overview of CG Visualization for Computational Mechanics

    AOKI Takayuki

    The Computational Mechanics Conference   2006 ( 19 )   7 - 8   2006.11

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  • 443 Large Data Visualization for Numerical Simulation of Geomagnetic Field Variations Dynamos

    KATO Shigeru, MATSUSHIMA Masaki, TAKAHASHI Futoshi, OGAWA Satoi, AOKI Takayuki

    The Computational Mechanics Conference   2006 ( 19 )   715 - 716   2006.11

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  • 446 Photo-realistic Visualization of Typhoon using Ray tracing

    SATO Shizuka, OGAWA Satoi, AOKI Takayuki, IMAI Yohsuke, TSUBOKI Kazuhisa, SAKAKIBARA Atsushi

    The Computational Mechanics Conference   2006 ( 19 )   721 - 722   2006.11

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  • 1605 Photo-realistic Visualization of Bubbly Flow by Grid Computing

    OGAWA Satoi, AOKI Takayuki, IMAI Yohsuke, TAKASE Kazuyuki

    The Computational Mechanics Conference   2005 ( 18 )   795 - 796   2005.11

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  • 2602 A Stable Coupling Method for Fluid Flow Simulations on Collocated Grid with the IDO Scheme

    IMAI Yohsuke, AOKI Takayuki

    The Computational Mechanics Conference   2005 ( 18 )   617 - 618   2005.11

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  • Blood Flow Simulation by Using Higher-order Adaptive Mesh Refinement method

    IMAI Yohsuke, AOKI Takayuki, FUJIWARA Kazue, IKEHIRA Hiroo

    The Computational Mechanics Conference   2004 ( 17 )   337 - 338   2004.11

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    A Higher-order accurate Adaptive Mesh Refinement method is developed for blood flow simulation. The method based on the Interpolated Differential Operator scheme has third-order accuracy for Poisson equation. We integrate. Navier-Stokes equation by second-stage implicit Runge-Kutta method for numerical stability. We demonstrate the blood flow simulation with many branches, and show the effectiveness of the method.

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  • High Speed Computing of Fluid Equation by using GPU

    Sato Yusuke, Aoki Takayuki

    The Computational Mechanics Conference   219 - 220   2004

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  • Computational Schemes by using Multi-measures(CIP and IDO methods)

    AOKI Takayuki, FENG Xiao

    Journal of the Japan Society for Computational Engineering and Science   8 ( 4 )   796 - 799   2003.10

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  • 3.5.可視化・ビジュアリゼーション(3.計算力学)(<特集>機械工学年鑑)

    青木 尊之

    日本機械学會誌   106 ( 1017 )   573 - 573   2003.8

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  • Blood flow simulation based on MRI image data I

    AOKI Takayuki, Ikehira Hiroo

    The Computational Mechanics Conference   2000 ( 13 )   199 - 200   2000.11

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    A system for the blood flow simulation based on MRI medical image is developed. The structure of the blood vessel is extracted after noise removel. The numerical simulation adapts IDO (Interpolated Differential Operator) scheme, and the Cut-Cell method is introduced for complex boundaries. Preliminary results show that the scheme is effective for real vessel structure and applicable to the simulation for interaction between blood flow and vessel.

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  • How to make high quality animation using Motion JPEG, DV, and MPEG2 formats by low cost PC

    Aoki Takayuki

    Proceedings of the Society Conference of IEICE   1998 ( 1 )   463 - 464   1998.9

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  • 5a-K-8 Hydrodynamic Analysis for Implosion Nonuniformity and Aiming Error by Adaptive Grid CIP Scheme

    Aoki Takayuki, Niu Keishiro

    1989 ( 4 )   234 - 234   1989.9

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  • 5a-K-3 Reduction of Implosion Nonuniformity by Radiation Transport in LIB-ICF II : Indirect Driven Target

    Aoki Takayuki, Niu Keishiro

    1989 ( 4 )   232 - 232   1989.9

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  • 28a-TF-10 Reduction of Implosion Nonuniformity by Radiation Transport in LIB-ICF

    Aoki Takayuki, Niu Keishiro

    44 ( 4 )   136 - 136   1989.3

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Presentations

  • Large-Scale Multi-GPU Simulation of Seismic-Wave Propagation for The Shallow Subduction-Zone Earthquakes International conference

    Taro Okamoto, Hiroshi Takenaka, Takeshi Nakamura, Takayuki Aoki

    AOGS 11th Annual Meeting  2014.7 

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    Venue:札幌, ロイトン札幌ホテル  

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  • 等軸晶形成のphase-fieldモデリングと2次元大規模シミュレーション

    高木 知弘, 坂根 慎治, 佐藤 遼太郎, 大野 宗一, 澁田 靖, 青木 尊之

    日本鉄鋼協会第177回春季講演大会, 材料とプロセス  2019.3 

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    Venue:東京電機大学 東京千住キャンパス  

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  • 動的負荷分散による粒子法(SPH/DEM)の大規模シミュレーション ?GPUスパコンでの実装と性能?

    都築怜理, 青木尊之

    ワークショップ 自由表面や気液界面を含む流れの数値解析 ?粒子法と格子法, 数理と実践?  2014.9 

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    Venue:博多  

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  • Large-scale HPC Applications on a GPU supercomputer TSUBAME Invited

    青木尊之

    エレクトロニクス実装学会 システムインテグレーション実装技術委員会・研究会  2014.9 

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    Venue:東京, 回路会館  

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  • GPUを用いた大規模アプリケーションの最適化および可視化

    小野寺直幸, 青木尊之, 下川辺隆史, 杉原健太, 宮下達治, 泉田康太

    日本原子力学会「2014年秋の大会」、計算科学技術部門企画セッション「解析結果可視化の最前線」  2014.9 

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    Venue:京都, 京都大学  

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  • 格子法による気液二相流のGPUスパコンを用いた大規模シミュレーション ?粒子法と同じ自由度で直接比較?

    杉原健太, 小野寺直幸, 青木尊之

    ワークショップ 自由表面や気液界面を含む流れの数値解析 ?粒子法と格子法, 数理と実践?  2014.9 

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    Venue:博多  

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  • ピンポン玉の運動のスパコンによる大規模流体構造連成解析

    小野寺直幸, 青木尊之, 泉田康太

    第92期 日本機械学会流体工学部門  2014.10 

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    Venue:富山, 富山大学  

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  • インド洋に面した地域の津波ハザード・シミュレーション? -高精度スキームによる遡上シミュレーション-

    杉山暁洋, 青木尊之, 本多潔

    第28回数値流体力学シンポジウム  2014.12 

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    Venue:東京, 船堀タワーホール  

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  • Large-scale granular simulations using Dynamic load balance on a GPU supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki

    Proceedings of the 2014 ACM/IEEE conference on Supercomputing (SC'14)  2014.11 

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    Venue:New Orleans, USA  

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  • GPUスパコンにおける動的負荷分散を用いた粒子法による大規模流体シミュレーション

    都築怜理, 青木尊之

    日本機械学会 第27回計算力学講演会  2014.11 

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    Venue:盛岡, 岩手大学  

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  • Real-time Volume Visualization for Large-scale Grid-based Fluid Simulations on Distributed multi-GPU System International conference

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    平成26年度 九州大学マス・フォア・インダストリ研究所 共同利用研究集会 シンポジウム「デジタル映像表現のための数理的手法(MEIS2014)」  2014.11 

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    Venue:福岡, 九州大学  

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  • High-productivity Framework on GPU-rich Supercomputers for Operational Weather Prediction Code ASUCA International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    Proceedings of the 2014 ACM/IEEE conference on Supercomputing (SC'14)  2014.11 

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    Venue:New Orleans, USA  

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  • Large-scale Stencil and Particle Applications and Their Performances on a GPU supercomputer

    Takayuki Aoki

    JST/CREST International Symposium on Post Petascale System Software  2014.12 

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    Venue:Kobe, Integrated Research Center of Kobe University  

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  • 地震波から推定される2011年東北地方太平洋沖地震の破壊過程 不均質構造モデルにもとづくグリーン関数を用いたインバージョン

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    第14回日本地震工学シンポジウム  2014.12 

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    Venue:千葉, 幕張メッセ  

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  • ヒ?ンホ?ン玉の乱流中て?の浮遊の 大規模流体構??連成解析

    小野寺直幸, 青木尊之, 泉田康太

    日本機械学会 第27回計算力学講演会  2014.11 

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    Venue:盛岡, 岩手大学  

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  • 不均質構造モデルによる地震波グリーン関数波形を用いた2011年東北地方太平洋沖地震の破壊過程(4)

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地震学会2014年度秋季大会  2014.11 

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    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • 流入・流出を伴う気液二相が存在する容器内における気泡挙動の解析

    泉田康太, 青木尊之, 小野寺直幸, 杉原健太, 中島聖, 本郷均, 横畑 英明

    第28回数値流体力学シンポジウム  2014.12 

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    Venue:東京, 船堀タワーホール  

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  • 垂直軸型風車付き津波避難タワーの解析?ーVOFベース大規模シミュレーションによる津波衝撃圧の評価ー

    杉原健太, 青木尊之, 内山久和

    第28回数値流体力学シンポジウム  2014.12 

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    Venue:東京, 船堀タワーホール  

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  • GPUスパコンによる動的領域分割を用いたサスペンション・フローの大規模粒子法シミュレーション Invited

    都築怜理, 青木尊之

    日本応用数理学会2015年度年会  2015.9 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:金沢, 金沢大学  

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  • 自動チューニング機構の導入によるステンシル計算のためのGPUコンピューティング・フレームワークの高度化

    下川辺隆史, 青木尊之, 小野寺直幸

    日本応用数理学会2015年度年会  2015.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢, 金沢大学  

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  • 動的負荷分散によるGPUスパコンを用いた粒子法の大規模シミュレーション手法の開発

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第7回 シンポジウム  2015.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, THE GRAND HALL品川  

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  • Large-Scale Suspension Flow Simulations Using a Particle Method on a GPU Supercomputer International conference

    Takayuki Aoki, Satori Tsuzuki, Seiya Watanabe

    13th US National Congress on Computational Mechanics  2015.7 

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    Venue:San Diego, USA  

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  • LBMを用いた中立都市大気境界層の相似性の検討

    Ahmad Nurul Huda, 神田学, 小野寺直幸, 青木尊之, 八木 綾子

    日本流体力学会 年会2015  2015.9 

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    Venue:東京, 東京工業大学  

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  • Large-scale DEM Simulations using Non-spherical Elements on GPU International conference

    Seiya Watanabe, Takayuki Aoki, Satori Tsuzuki

    PARTICLES2015  2015.9 

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    Venue:Barcelona, Spain  

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  • 二結晶二元合金におけるデンドライト競合成長の大規模3D phase-fieldシミュレーション

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本鉄鋼協会第170回秋季講演大会  2015.9 

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    Venue:九州大学, 伊都キャンパス  

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  • Phase-field-lattice Boltzmann simulations of dendrite growth in melt flow by GPU supercomputer TSUBAME2.5

    坂根慎治, 高木知弘, Roberto Rojas, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    GPU Technology Conference (GTC Japan 2015)  2015.9 

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    Language:English   Presentation type:Poster presentation  

    Venue:東京, 虎ノ門ヒルズフォーラム  

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  • ステンシル計算の高速化のためのC++テンプレートによるGPUカーネル生成

    長谷川雄太, 青木尊之

    第149回ハイパフォーマンスコンピューティング研究発表会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 工学院大学  

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  • 動的負荷分散によるGPUスパコンを用いた粒子法の大規模シミュレーション手法の開発II ?流体・構造連成計算への適用?

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第7回 シンポジウム  2015.7 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京, THE GRAND HALL品川  

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  • Multi-GPU Mesh-refined Lattice Boltzmann Simulation for Aerodynamics of Racing Bicycles Invited

    Yuta Hasegawa, Takayuki Aoki

    Taiwan-Japan CFD workshop  2019.3 

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    Venue:National Tsing Hua University, Hsinchu  

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  • 炉心燃料チャンネル内大規模二相流シミュレーション

    日本シミュレーション学会年会  2005 

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  • 3次精度局所細分化適合格子(AMR)法による衝撃波の計算

    2005 

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  • 粒子法を用いた複雑形状のミクロスケール血流シミュレーション

    2005 

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  • GPU-accelerated 3D phase-field simulations of dendrite competitive growth during directional solidification of binary alloy International conference

    S. Sakane, T. Takaki, M. Ohno, T. Shimokawabe, T. Aoki

    Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP XIV 2015)  2015.6 

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    Language:English   Presentation type:Poster presentation  

    Venue:Awaji, Yumebutai International Conference Center  

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  • 複雑な地形や建物を含んだ大規模3次元爆風シミュレーション

    2005 

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  • 接触相互作用に基づく?子法のGPU計算におけるメモリアクセスの改善による高速化

    渡辺勢也, 青木尊之, 都築怜理

    第149回ハイパフォーマンスコンピューティング研究発表会  2015.6 

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    Venue:東京, 工学院大学  

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  • 静力学気象モデルに対する高次精度陽的オイラー法とセミ・ラグランジュ法の比較検討

    2005 

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  • Conservative IDO Scheme

    2005 

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  • A New Approach of Numerical Simulation for Blastwave - Structure Interaction (I)

    2005 

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  • 血管適合細分化計算による高解像度血流解析

    2005 

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  • レイトレーシング法による台風シミュレーションの可視化

    第19回計算力学講演会  2006 

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  • 地球磁場変動ダイナモシミュレーションにおける大規模データの可視化

    第19回計算力学講演会  2006 

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  • 雲解像領域気象モデルの力学過程へのセミ・ラグランジュ法の導入

    第20回数値流体力学シンポジウム  2006 

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  • Fluid Simulation by Using Multi-Moment Scheme and Conservative Formulation

    2006 

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  • コンピュータグラフィックスを応用した計算力学における可視化概論

    第19回計算力学講演会  2006 

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  • 気象におけるマルチスケール・シミュレーション

    第49回 自動制御連合講演会  2006 

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  • 個別要素法を用いた落石シミュレーション

    第19回計算力学講演会  2006 

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  • 重合格子IDO法による移動境界問題の計算

    日本機械学会2006年度年次大会  2006 

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  • 炉心内複雑二相流挙動に関する数値解析

    日本機械学会2006年度年次大会  2006 

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  • High-Accurate Numerical Simulation for Flow Phenomena

    Proceedings of 3rd International Workshop on New Fronters in Computational Geotechniques  2006 

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  • PHOTO-REALISTIC VISUALIZATIONS IN COMPUTATIONAL FLUID DYNAMICS

    12 th International Symposium on Flow Visualization (ISFV12)  2006 

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  • Visualizations in Computational Fluid Dynamics

    The 12th International Symposium on Flow Visualization  2006 

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  • 稠密炉心内3次元気泡流構造に関する大規模シミュレーション

    機械学会関東支部第12期総会  2006 

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  • 高精度保存形スキームによる自由界面を含む流れの解析

    日本機械学会2006年度年次大会  2006 

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  • 保存形IDO法による圧縮性および非圧縮性流体解法

    日本機械学会2006年度年次大会  2006 

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  • 微小流路を上昇する大規模な気泡挙動の予測と高詳細可視化

    日本原子力学会「2006年春の年会」  2006 

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  • Fluid Simulation by Using Multi-Moment Scheme and Conservative Formulation

    2006 

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  • Large Data Visualization for Numerical Simulation of Geomagnetic Field Variations Dynamos

    The 19th Computational Mechanics Conference  2006 

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  • Numerical Simulation of Moving Problem by Overset-grid IDO Method

    Mechanical Engineering Congress, 2006  2006 

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  • Compressible and incompressible fluid flow simulation by using the conservative IDO scheme

    Mechanical Engineering Congress  2006 

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  • High-Accurate Numerical Simulation for Flow Phenomena

    Proceedings of 3rd International Workshop on New Fronters in Computational Geotechniques  2006 

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  • PHOTO-REALISTIC VISUALIZATIONS IN COMPUTATIONAL FLUID DYNAMICS

    12 th International Symposium on Flow Visualization (ISFV12)  2006 

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  • Numerical simulation for vertical-axis wind turbine by high-accurate overset grid method

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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  • Numerical method for geomaterial based on fluid-particle interaction

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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  • Visualizations in Computational Fluid Dynamics

    The 12th International Symposium on Flow Visualization  2006 

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  • Accuracy study of the IDO-CF scheme by Fourier analysis

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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  • 保存形IDO法を用いたShallow Waterモデルによる津波の遡上計算

    第21回数値流体力学シンポジウム  2007 

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  • Simulation of free surface flow interacting with moving particles by using immersed boundary method

    International Conference on Violent flows 2007  2007 

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  • 境界埋め込み法を用いた地盤の液状化解析手法の開発

    第20回計算力学講演会  2007 

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  • 保存形IDO法の安定性解析

    日本機械学会第20回計算力学講演会  2007 

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  • High-accurate computation for compressible and incompressible fluid dynamics by multi-moment conservative scheme

    The 4th Japan-Taiwan Workshop on Mechanical and Aerospace Engineering  2007 

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  • 保存形IDO法の安定性解析

    第20回計算力学講演会(CMD 2007)  2007 

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  • G80-GPUによるIDO法を用いた流体計算

    第20回計算力学講演会(CMD 2007)  2007 

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  • Turbulent flow computations by conservative interpolated differential operator (IDO) scheme

    International Conference on Recent Developments of Numerical Schemes for Flow Problems  2007 

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  • Conservative interpolated differential operator (IDO) scheme

    International Conference on Recent Developments of Numerical Schemes for Flow Problems  2007 

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  • 保存形IDO法スキームによる爆風計算の検証

    火薬学会 2007年度年会講演要旨集  2007 

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  • 大規模CFD のフォトリアリスティック・ビジュアリゼーション

    日本原子力学会・2007年秋の大会  2007 

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  • An AMR Framework for Realizing Effective High-Resolution Simulations on Multiple GPUs International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    SIAM Conference on Parallel Processing for Scientific Computing (PP18)  2018.3 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tokyo, Waseda University  

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  • Parallel GPU Phase-Field Simulations of Dendrite Competitive Growth International conference

    Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Shinji Sakane, Takashi Shimokawabe, Takayuki Aoki

    SIAM Conference on Parallel Processing for Scientific Computing (PP18)  2018.3 

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    Venue:Tokyo, Waseda University  

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  • An Octree-Based AMR Lattice Boltzmann Method for Multi-GPU Aerodynamics Simulations International conference

    Yuta Hasegawa, Takayuki Aoki

    SIAM Conference on Parallel Processing for Scientific Computing (PP18)  2018.3 

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    Venue:Tokyo, Waseda University  

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  • Extending Existing Simulation Software Packages with Spatial Adaptivity in a Minimal-Invasive Way International conference

    Michael Lahnert, Takayuki Aoki, Malte Brunn, Carsten Burstedde, Steffen Hirschmann, Dirk Pfluger, Miriam Mehl

    SIAM Conference on Parallel Processing for Scientific Computing (PP18)  2018.3 

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    Venue:Tokyo, Waseda University  

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  • Multi-GPU phase-field simulation of growth, motion and collision of multiple dendrites International conference

    S. Sakane, T. Takaki, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    TMS 2018 Annual Meeting & Exhibition (TMS2018)  2018.3 

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    Venue:Phoenix Convention Center, Phoenix, Arizona, USA  

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  • Statistical behavior of ideal grain growth an ultra-large-scale phase-field simulation study International conference

    E. Miyoshi, T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    TMS 2018 Annual Meeting & Exhibition (TMS2018)  2018.3 

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    Venue:Phoenix Convention Center, Phoenix, Arizona, USA  

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  • スパコンによるリアルワールドの流れの再現

    青木尊之

    国立大学共同利用・共同研究拠点協議会 第71回 知の拠点セミナー  2018.2 

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    Venue:東京, 京都大学 東京オフィス  

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  • Large-Scale Applications for Real-World Problems Solving Partial Differential Equations on Heterogeneous GPU Machines International conference

    Takayuki Aoki

    SIAM Conference on Parallel Processing for Scientific Computing (PP18)  2018.3 

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    Venue:Tokyo, Waseda University  

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  • 格子ボルツマン法を用いた浮遊物体を含む自由界面流れのシミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    第31回 数値流体力学シンポジウム (CFD2017)  2017.12 

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    Venue:京都, 京都工芸繊維大学  

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  • GPUスパコンと GPU計算による格子法・粒子法の大規模アプリケーション

    青木尊之

    核融合研数値実験炉プロジェクト全体会合  2018.1 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜, 核融合科学研究所  

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  • Large-scale CFD Applications on GPU Supercomputer TSUBAME International conference

    Takayuki Aoki

    CFD21  2013.8 

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    Venue:Taiwan  

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  • ベストペーパーアワード

    松下真太郎, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • 近接相互作用に基づく大規模粒子計算(個別要素法)における効率的な動的負荷分散手法の提案とGPU スパコンでの実装

    都築怜理, 青木尊之, 下川辺隆史

    日本応用数理学会2013年度年会  2013.9 

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    Venue:福岡  

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  • Octree細分化格子によるLBMを用いたロードバイクの空力計算

    長谷川雄太, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • GPU を用いた固体粒子群を含む固気液三相流の大規模シミュレーション

    小野寺直幸, 青木尊之

    日本混相流学会・混相流シンポジウム2013  2013.8 

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    Venue:信州大学 長野キャンパス  

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  • 熱溶質対流を伴う二元合金凝固phase-fieldシミュレーションの複数GPU並列化

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • GPUを用いた固体粒子群を含む固気液三相流の大規模シミュレーション

    小野寺直幸, 青木尊之

    日本混相流学会混相流シンポジウム  2013.8 

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    Venue:信州大学  

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  • 界面に適合するAMR法と弱圧縮性近似に基づく完全陽解法を組み合わせた気液二相流の三次元計算

    松下真太郎, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • 3次元グリーンテンソル波形による2011年東北地方太平洋沖地震の破壊過程(2)

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地震学会2013年秋季大会  2013.10 

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    Venue:神奈川県横浜市  

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  • GPU を用いた格子ホ?ルツマン法による大規模流体・構造連成解析

    小野寺直幸, 青木尊之, 下川辺隆史

    日本流体力学会年会2013  2013.9 

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    Venue:東京農工大学  

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  • マルチフェーズフィールド法に基づく領域分割を用いたAMR計算の動的負荷分散

    渡辺勢也, 青木尊之, 黄遠雄, 長谷川雄太, 高木知弘

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • A Large-scale Particle Simulations based on Dynamic Load Balance on a GPU-rich Supercomputer International conference

    S. Tsuzuki, T. Aoki, T. Shimokawabe

    Third Conference on Particle-Based Methods PARTICLES 2013  2013.9 

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    Venue:Stuttgart, Germany  

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  • Permeability prediction of dendrite structure by large-scale phase-field lattice Boltzmann simulation International conference

    T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    TMS 2018 Annual Meeting & Exhibition (TMS2018)  2018.3 

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    Venue:Phoenix Convention Center, Phoenix, Arizona, USA  

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  • Toward Real-time Ray Tracing for CFD Visualization via NVIDIA Iray

    Un-Hong Wong, Hon-Cheng Wong, Meng Zhu, Aoki Takayuki

    GTC (GPU Technology Conference) Japan 2013  2013.7 

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    Venue:Tokyo  

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  • スパコンTSUBAMEによるペタスケール格子系アプリケーション

    青木尊之

    GPUコンピューティングチュートリアル講演会  2013.8 

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    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:首都大学東京南大沢キャンパス  

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  • 安息角に対する個別要素法のパラメータの感度分析

    森口 周二, 奥山大輝, 寺田 賢二郎, 青木 尊之

    第21回応用力学シンポジウム  2018.5 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:愛知県名古屋市, 名城大学天白キャンパス  

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  • 大規模phase-field計算による多結晶二元合金一方向凝固過程の競合成長挙動評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 青木尊之

    日本鉄鋼協会 第175回春季講演大会  2018.3 

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    Venue:千葉工業大学, 新習志野キャンパス  

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  • Efficient TVD MHD Simulations on a Distributed Multi-GPU System Using GPU Direct 2.0 International conference

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    The 11th International School / Symposium for Space Simulations  2013.7 

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    Venue:National Central University, Taiwan, R.O.C.  

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  • A Two-Phase Flow Simulation Using a Full-Explicit Scheme with Interface-Adapted AMR Method International conference

    Shintaro Matsushita, Takayuki Aoki, Un-Hong Wong

    ParCFD18  2018.5 

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    Venue:Indianapolis, USA  

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  • GPU スパコンを用いた大規模 DEM シミュレーションによる紛体の撹拌解析

    都築怜理, 青木尊之

    日本機械学会・第26回計算力学講演会  2013.11 

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    Venue:佐賀  

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  • GPU-accelerated Lattice Boltzmann Simulations with Octree-based Dynamic AMR Method International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    DSFD2018  2018.6 

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    Venue:Worcester, USA  

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  • GPUスパコンTSUBAMEによるペタスケール物理シミュレーション Invited

    青木尊之

    日本計算工学会・S&V (Simulation & Visualization) 研究会  2013.11 

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    Venue:中央大学  

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  • MPF法によるトポロジー最適化を用いた負荷バランスとノード間通信低減を両立させる動的領域分割の開発

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第9回 シンポジウム  2018.7 

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    Venue:東京, THE GRAND HALL品川  

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  • Large-scale 3D MHD simulation on GPU-rich supercomputer TSUBAME

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    CMD2013  2013.11 

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    Venue:Saga  

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  • Simulations of Free Surface Flows Interacting with Solid Objects by Lattice Boltzmann Method Using Multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    ECCM-ECFD 2018  2018.6 

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    Venue:Glasgow, UK  

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  • 気象計算コードのためのGPUコンピューティング・フレームワーク

    下川辺隆史, 青木尊之, 小野寺直幸

    日本機械学会・第26回計算力学講演会  2013.11 

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    Venue:佐賀  

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  • A full-explicit two-phase flow simulation with interface-adapted AMR method International conference

    Shintaro Matsushia, Takayuki Aoki, Un-Hong Wong

    ECCM-ECFD 2018  2018.6 

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    Venue:Glasgow, UK  

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  • 複数 GPU (Graphics Processing Unit) による大規模格子計算(FDTD)の高速化 Invited

    青木尊之

    電子情報通信学会・マイクロウェーブワークショップ  2013.11 

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    Venue:パシフィコ横浜  

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  • Dynamic load balance for a granular simulation using billion particles on GPU supercomputer

    Satori Tsuzuki, Takayuki Aoki

    The 4th AICS International Symposium  2013.12 

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    Venue:Kobe, AICS  

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  • 回転翼に適合するAMR重合格子を用いた垂直軸型風車周り流れのGPU計算

    杉原健太, 外丸慎之介, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • 安息角に対する物性や粒子形状の影響

    奥山大輝, 橘一光, 寺田賢二郎, 森口周二, 青木尊之

    第23回計算工学講演会  2018.6 

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    Venue:名古屋, 愛知県産業労働センター ウインクあいち  

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  • 多結晶粒成長の大規模マルチフェーズフィールドシミュレーション 〜GPU スパコンSUBAME 2.0 への実装〜

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    日本機械学会・第26回計算力学講演会  2013.11 

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    Venue:佐賀  

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  • Permeability Prediction for 3D Dendrites Structure by Large-Scale Phase-Field Lattice Boltzmann Simulation International conference

    T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Aoki

    4th International Congress on 3D Materials Science (3DMS 2018)  2018.6  3DMS 2018

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    Venue:Culture Yard Conference Center, Elsinore, Denmark  

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  • GPUを用いた格子ボルツマン法による流体構造連成のラージエディ・シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史

    日本機械学会・第26回計算力学講演会  2013.11 

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    Venue:佐賀  

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  • Aerodynamics Study for Complex Bodies by using Locally Refined Mesh and Lattice Boltzmann Method International conference

    Yuta Hasegawa, Takayuki Aoki

    ECCM-ECFD 2018  2018.6 

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    Venue:Glasgow, UK  

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  • GPU で演算加速された1億個の粒子による大規模粉体シミュレーション

    都築怜理, 青木尊之

    粉体工学会2013 年度秋期研究発表会  2013.10 

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    Venue:大阪  

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  • Simulation of a Ping-pong Ball Freely Rising in Water Using Immersed Boundary-Lattice Boltzmann Method

    Yang Kai, Hasegawa Yuta, Watanabe Seiya, Aoki Takayuki

    JSCES2018  2018.6 

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    Venue:Nagoya, Winc Aich  

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  • Space-filling Curve に基づいた AMR (Adaptive Mesh Refinement) 法による圧縮性流体計算のアルゴリズムとGPU実装 Invited

    青木尊之

    学術情報メディアセンターセミナー  2013.10 

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    Venue:京都  

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  • Large-Scale Phase-Field Simulation of 3D Ideal Grain Growth: Testing the Mean-Field Theory and Stereological Analysis International conference

    E. Miyoshi, T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    2018.6  3DMS 2018

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    Venue:Culture Yard Conference Center, Elsinore, Denmark  

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  • 複数GPUによる格子に基づいたシミュレーションのためのマルチGPU コンヒ?ューティンク?・フレームワーク

    下川辺隆史, 青木尊之, 小野寺直幸

    HPCS2014  2014.1 

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    Venue:一橋大学  

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  • Effects of repose angle and basal friction angle in granular flow simulations Invited International conference

    Shuji Moriguchi, Hiroki Okuyama, Kenjiro Terada, Tadashi Kawai, Takayuki Aoki

    IS Atlanta 2018  2018.9 

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    Venue:Academy of Medicine, Atlanta, Georgia. USA  

    The effects of the repose angle and the basal friction angle in granular flow simulations are discussed in this study. These important parameters characterize the flow behaviors of granular materials. A database of the repose angle, which includes data on the relation between the repose angle and distinct element method (DEM) input parameters, was prepared based on the simulated results of the repose angle. A series of DEM simulations was then performed to quantify the effects of the repose angle and the basal friction angle in granular flow simulations. The obtained results indicate that the basal friction angle strongly affects the run-out distance, and that contribution are much stronger than the repose angle. Therefore, due consideration should be given to the basal friction angle when predicting the run-out distance in granular flow simulations.

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  • A High-productivity Framework for Multi-GPU computation of Mesh-based applications International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    HiStencil  2014.1 

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    Venue:Vienna, Austria  

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  • TSUBAME の GPU を用いた格子ホ?ルツマン法による 東京都心部の大規模気流シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史, 宮下達治

    第27回数値流体力学シンポジウム  2013.12 

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    Venue:名古屋大学  

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  • AMR法を導入した格子ボルツマン法による大規模流体構造連成解析

    渡辺勢也, 青木尊之, 長谷川雄太

    日本流体力学会 年会2018  2018.9 

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    Venue:大阪, 大阪大学  

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  • Efficient large scaleMHD simulations: 3D OT vortexand Solar Wind - Earthinteraction using distributedmulti-GPU system

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    CFD2014  2013.12 

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    Venue:Nagoya University  

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  • 激しい二相流に適用するハイブリッド速度フィルター付きキュムラント格子ボルツマン法

    Sitompul Yos Panagaman, Takayuki Aoki

    日本流体力学会 年会2018  2018.9 

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    Venue:大阪, 大阪大学  

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  • GPUスパコン TSUBAME による大規模 CAE アプリと産業利用

    青木尊之

    第24回関東CAE懇話会  2014.1 

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    Venue:早稲田大学  

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  • Three-dimensional phase-field simulations during directional solidification of a binary alloy considering thermal-solutal convection International conference

    S. Sakane, T. Takaki, M. Ohno, Y. Shibuta, T. Aoki

    The 13th World Congress in Computational Mechanics (WCCM 2018)  2018.7  WCCM 2018

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    Venue:Marriott Marquis, New York, USA  

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  • ものづくり系アプリの将来 −エクサスケール時代のスパコンを見通して−

    青木尊之

    第14回IPAB(並列生物情報処理イニシアティブ)シンポジウム  2013.12 

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    Venue:東京  

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  • 安息角をベースとした土砂流動解析のための個別要素法の解析パラメータ選定

    奥山大輝, 橘一光, 森口周二, 寺田賢二郎, 青木尊之

    第53回地盤工学研究発表会  2018.7 

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    Venue:香川県高松市, サンポートホール高松  

    粒状体の特性を特徴づける指標の1つである安息角をベースとして,土砂流動解析に用いる個別要素法の解析パラメータの選定方法に関する検討を行った。本研究では,個別要素法で直接モデル化が可能なサイズの砕石を対象として検討を進めた.まず,砕石の安息角を計測する簡単な模型実験を実施し,その安息角の再現解析を通じて反発係数や粒子間摩擦などの入力パラメータおよび粒子形状の影響を確認した.またその結果に基づいて,入力パラメータに対する安息角のデータベースを作成した.さらに,砕石を用いた流動模型実験の再現解析を実施し,その再現解析を通じて作成したデータベースの有用性を確認した.

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  • 界面に適合するAMR法を用いた非圧縮性気液二相流の完全陽解法計算とGPU実装

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第9回 シンポジウム  2018.7 

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    Venue:東京, THE GRAND HALL品川  

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  • A High-productivity Framework for Weather Prediction Code on Multi-GPU Computing International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    Proceedings of the 5th Asia Pacific Congress on Computational Mechanics and and 4th International Symposium on Computational  2013.12 

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    Venue:Singapore  

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  • 界面に適合するAMR 法を用いた液膜の形成と崩壊の数値シミュレーション

    松下真太郎, 青木尊之

    混相流シンポジウム 2018  2018.8 

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    Venue:仙台, 東北大学  

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  • Scalability model for multi-GPU computation of stencil applications using regular structured meshes with explicit time integration

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    HOKKE-19  2013.12 

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    Venue:Hokkaido  

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  • 多数の瓦礫を含む津波の大規模シミュレーション

    河原淳, 青木尊之, 渡辺勢也

    日本流体力学会 年会2018  2018.9 

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    Venue:大阪, 大阪大学  

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  • Large-scale Particle Simulations using Dynamic Load Balance on TSUBAME 2.0 Supercomputer International conference

    S. Tsuzuki, T. Aoki

    Proceedings of the 5th Asia Pacific Congress on Computational Mechanics and and 4th International Symposium on Computational  2013.12 

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    Venue:Singapore  

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  • A study on permeability coefficient of porous media using immersed boundary method International conference

    Ikkoh Tachibana, Shuji Moriguchi, Kenjiro Terada, Takayuki Aoki

    13th World Congress on Computational Mechanics  2018.7 

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    Venue:Marriott Marquis, New York, USA  

    This study aims to analyze the permeability behavior of porous media with the help of a numerical simulation which can represent microscopic flow behaviors. 3D Navier-Stokes equation is employed for the governing equation of fluid movement in the simulation, while the immersed boundary method is utilized to embed spherical boundary on the grains' surface in the finite difference formulation with the staggered grid system. In present study, a series of numerical permeability tests were carried out on the representing volume unit (RVE) of granular material, expressed as a cuboid region where solid spheres were randomly packed. Unidirectional flow was considered and static pressure gradient is applied as the boundary condition, while the other perpendicular directions were treated as periodic. The profile of each RVE as a granular material was controlled with its void ratio and distribution of inner particle diameter. Also, in order to compare results from different simulation conditions and inner structures, the Reynolds number for the porous media is taken into account.
    The results were compared to the former simulations with grid-wise uniformed inner structures conducted by the corresponding author [3] and several popular empirical formulae for an estimation of macroscopic permeability coefficient. The discussion is aimed at clarifying the relationship between present results and existing empirical formulae of permeability coefficient for soils within wide range of material profile index.

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  • Large-Eddy Simulation of Fluid-Structure Interaction using Lattice Boltzmann Method on Multi-GPU Clusters International conference

    Naoyuki Onodera, Takayuki Aoki, Takashi Shimokawabe, Tatsuji Miyashita, Hiromichi Kobayashi

    Proceedings of the 5th Asia Pacific Congress on Computational Mechanics and and 4th International Symposium on Computational  2013.12 

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    Venue:Singapore  

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  • 多数の瓦礫を含んだ津波が構造物へ与える影響の数値解析

    渡辺勢也, 青木尊之, 長谷川雄太, 河原淳

    混相流シンポジウム 2018  2018.8 

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    Venue:仙台, 東北大学  

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  • GPUコンピューティング・フレームワークを用いた気象計算コードの開発

    下川辺隆史, 青木尊之, 小野寺直幸

    日本計算工学会・第19回計算工学講演会  2014.6 

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    Venue:広島, 広島大学  

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  • GPUによる大規模粒子法シミュレーションの実問題への 適用

    都築怜理, 青木尊之

    日本計算工学会 第19回計算力学講演会  2014.6 

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    Venue:広島, 広島大学  

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  • Peta-scale large-eddy simulation using lattice Boltzmann method on the TSUBAME supercomputer International conference

    Naoyuki Onodera, Takayuki Aoki

    KSME-JSME Joint Symposium on Computational Mechanics & CAE 2014 at JEJU  2014.5 

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    Venue:JEJU, Korea  

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  • スパコンによる大規模計算に基づいた自転車の集団走行の空力評価

    長谷川雄太, 青木尊之

    スポーツ工学・ヒューマンダイナミクス2018(SHD2018)  2018.11 

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    Venue:京都, 京都テルサ  

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  • GPUスパコンを用いたバンカーショットの大規模DEM計算

    都築怜理, 青木尊之

    粉体工学会2014 年度春期研究発表会  2014.5 

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    Venue:京都, メルパルク京都  

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  • 細分化格子LBMによる自転車の集団走行の大規模空力解析

    長谷川雄太, 青木尊之

    第31回 計算力学講演会  2018.11 

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    Venue:徳島, 徳島大学  

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  • Large-scale GPU Applications for Scientific Computing International conference

    Takayuki Aoki

    SIAM Parallel Processing 2014  2014.2 

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    Venue:Portland, US  

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  • Explicit CFD solvers for free-surface flows and gas-liquid two-phase flows International conference

    Takayuki Aoki, Shintaro Matsushita, Seiya Watanabe

    Taiwan-Japan Workshop on on Mechanical and Aerospace Engineering  2018.10 

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    Venue:Taiwan, National Chiao Tung University  

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  • Peta-Scale Flow Simulations using GPUs Invited International conference

    Takayuki Aoki

    Advances in Computational Fluid?Structure Interaction and Flow Simulation  2014.3 

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    Venue:Waseda U.  

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  • A Fully-explicit Two-phase Flow Simulation Based on Weakly Compressible Assumption with Interface-adapted AMR Method International conference

    Shintaro Matsushita, Takayuki Aoki

    ICM2018  2018.10 

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    Venue:Taiwan, Yilan City  

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  • Phase-field法と格子ボルツマン法による柱状デンドライト垂直流れの透過率評価

    高木 知弘, 坂根 慎治, 大野 宗一, 澁田 靖, 青木 尊之

    日本鉄鋼協会第176回秋季講演大会  2018.9 

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    Venue:東北大学 川内キャンパス  

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  • スパコンTSUBAME目指すVDI 環境 International conference

    青木尊之

    High Performance VDI Conference 2018  2018.9 

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    Venue:沖縄, 沖縄科学技術大学院大学  

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  • Large-scale multi-GPU simulation of seismic-wave propagation and its application to analysis of the 2011 great Tohoku-Oki earthquake International conference

    Taro Okamoto, Hiroshi Takenaka, Tatsuhiko Hara, Takeshi Nakamura, Takayuki Aoki

    COMPSAFE 2014  2014.4 

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    Venue:Sendai  

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  • Multi-GPU large-scale phase-field lattice Boltzmann simulation of dendrite growth with thermal-solutal convection International conference

    Shinji Sakane, Tomohiro Takaki, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    The 9th Multiscale Materials Modeling (MMM2018)  2018.10 

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    Venue:Osaka, International Convention Center  

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  • 2.5次元遠地理論波形により地震波波形データから推定される東北地方太平洋沖地震の破壊過程

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地球惑星科学連合2014年大会  2014.4 

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    Venue:パシフィコ横浜  

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  • Large-scale multiphase flow simulations on a GPU supercomputer International conference

    Takayuki Aoki

    The 9th Multiscale Materials Modeling (MMM2018)  2018.11 

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    Venue:Osaka, International Convention Center  

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  • Large-scale Global MHD Simulation for Solar Wind Magnetosphere Interaction on TSUBAME 2.5 International conference

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    GTC 2014(GPU Technology Conference) Japan 2014  2014.3 

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    Venue:San Jose, US  

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  • A Cumulant LBM with Hybrid-like Filter for Violent Two-phase Flows International conference

    Yos Panagaman Sitompul, Takayuki Aoki

    ICM2018  2018.10 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Taiwan, Yilan City  

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  • AMR-Based on Space-Filling Curve for Stencil Applications International conference

    Takayuki Aoki

    GTC 2014(GPU Technology Conference) Japan 2014  2014.3 

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    Venue:San Jose, US  

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  • Solidification microstructure formation by phase-field simulation with multi-GPU acceleration International conference

    Tomohiro Takaki, Shinji Sakane, Munekazu Ohno, Yasushi Shibuta, Takayuki Aoki

    The 9th Multiscale Materials Modeling (MMM2018)  2018.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Osaka, International Convention Center  

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  • 動的AMR法を導入した格子ボルツマン法の複数GPUによる大規模計算

    渡辺勢也, 青木尊之, 長谷川雄太

    第31回 計算力学講演会  2018.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島, 徳島大学  

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  • Large-scale particle simulations using dynamic load balance on GPU supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki

    11th. World Congress on Computational Mechanics (WCCM XI)  2014.7 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Barcelona, Spain  

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  • 複数GPUを用いた格子ボルツマン法による大規模流体・構造連成解析 −卓球競技におけるピンポン玉の軌道の解析−

    小野寺直幸, 青木尊之, 下川辺隆史, 小林宏充

    学際大規模情報基盤共同利用・共同研究拠点 第6回シンポジウム  2014.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, THE GRAND HALL  

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  • 粒成長過程における断面・立体組織特性の相関:大規模phase-field計算による研究

    三好 英輔, 高木 知弘, 大野 宗一, 澁田 靖, 坂根 慎治, 下川辺 隆史, 青木 尊之

    日本鉄鋼協会・日本金属学会関西支部鉄鋼プロセス研究会・材料化学研究会 平成30年度第2回合同研究会  2018.12 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都大学 吉田キャンパス  

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  • Large-eddy simulation of turbulent flow around a car body using lattice Boltzmann method on the TSUBAME supercomputer International conference

    Naoyuki Onodera, Takayuki Aoki

    11th. World Congress on Computational Mechanics (WCCM XI)  2014.7 

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    Venue:Barcelona, Spain  

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  • 複数 GPU を用いた格子ホ?ルツマン法による卓球競技のヒ?ンホ?ン玉のシミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史

    日本計算工学会・第19回計算工学講演会  2014.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島, 広島大学  

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  • Study on a ping-pong ball rising in water using AMR lattice Boltzmann method

    Yang Kai, Hasegawa Yuta, Watanabe Seiya, Aoki Takayuki

    CMD2018  2018.11 

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    Venue:Tokushima, Tokushima University  

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  • GPUスパコンによる大規模粒子法(DEM, SPH)シミュレーション

    都築怜理, 青木尊之

    第6回アクセラレーション技術発表討論会  2014.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄, 沖縄科学技術大学院大学  

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  • 格子ボルツマン法による浮遊物体を含む津波の大規模シミュレーション

    河原淳, 渡辺勢也, 青木尊之, 橋本博公

    第32回 数値流体力学シンポジウム (CFD2018)  2018.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 機械振興会館  

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  • AMR法の動的領域分割へのマルチフェーズフィールド法の適用

    渡辺勢也, 青木尊之, 松下真太郎, Christian Conti, 高木知弘

    第31回 計算力学講演会  2018.11 

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    Venue:徳島, 徳島大学  

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  • 界面に適合するAMR法と完全陽解法による高解像度気液二相流計算

    松下真太郎, 青木尊之

    第31回 計算力学講演会  2018.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島, 徳島大学  

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  • 動的負荷分散によるGPUスパコンを用いた粒子法の大規模シミュレーション手法の開発

    青木尊之, 都築怜理

    学際大規模情報基盤共同利用・共同研究拠点 第6回シンポジウム  2014.7 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京, THE GRAND HALL  

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  • 細分化格子LBMの複数GPU計算に基づく自転車の集団走行の空力計算

    長谷川雄太, 青木尊之

    第32回 数値流体力学シンポジウム (CFD2018)  2018.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 機械振興会館  

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  • マルチGPUコンピューティング・フレームワークを用いた高精度気象計算コードの開発

    下川辺隆史, 青木尊之, 小野寺直幸

    学際大規模情報基盤共同利用・共同研究拠点 第6回シンポジウム  2014.7 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京, THE GRAND HALL  

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  • GPUスパコンにおける動的負荷分散を用いたAMR法による大規模LBM計算

    渡辺勢也, 青木尊之, 長谷川雄太

    第32回 数値流体力学シンポジウム (CFD2018)  2018.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 機械振興会館  

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  • Real-time Global Magnetohydrodynamic Simulation and Visualization on Multiple GPUs International conference

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    16th International Symposium on Flow Visualization  2014.6 

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    Venue:Okinawa, Okinawa Convention Center  

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  • 激しい二相流に適用するフィルタリングされたキュムラント格子ボルツマン法

    Yos Panagaman Sitompul, Takayuki Aoki

    第32回 数値流体力学シンポジウム (CFD2018)  2018.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 機械振興会館  

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  • Real-time Ray Tracing for CFD Visualization via NVIDIA Iray International conference

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    16th International Symposium on Flow Visualization  2014.6 

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    Venue:Okinawa, Okinawa Convention Center  

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  • 界面に適合するAMR法と完全陽解法を用いた液膜形成と崩壊のGPU計算

    松下真太郎, 青木尊之

    第32回 数値流体力学シンポジウム (CFD2018)  2018.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 機械振興会館  

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  • A Full-explicit Two-phase Flow Simulation Based on Weakly Compressible Assumption with Interface-Adapted AMR Method Invited

    Shintaro Matsushita, Takayuki Aoki

    Taiwan-Japan CFD workshop  2019.3 

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    Venue:National Tsing Hua University, Hsinchu  

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  • Large-scale Lattice Boltzmann Simulations with Adaptively Refined Mesh on Multiple GPUs Invited

    Seiya Watanabe, Takayuki Aoki

    Taiwan-Japan CFD workshop  2019.3 

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    Venue:National Tsing Hua University, Hsinchu  

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  • 格子ボルツマン法を用いたヒ?ンホ?ン玉の運動の大規模ラーシ?エディ・シミュレーション

    小野寺直幸, 青木尊之, 泉田康太

    日本流体力学会年会 2014  2014.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台, 東北大学  

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  • 世界トップクラスのスパコンによるコンピュータシミレーション

    青木尊之

    河合塾「未来発見フォーラム2014」  2014.10 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:東京(東京国際フォーラム)  

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  • Large-scale Stencil and Particle Simulations on GPU supercomputer TSUBAME Invited International conference

    Takayuki Aoki

    CEMSE(Computer, Electrical and Mathematical Sciences & Engineering) Seminar  2014.9 

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    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:King Abdullah University of Science and Technology, Saudi Arabia  

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  • Stencil Applications with AMR based on Space-Filling Curve for GPU computing International conference

    Takayuki Aoki

    KAUST the CREST-ECRC workshop(KAUST Invited Lecture)  2014.9 

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    Venue:King Abdullah University of Science and Technology, Saudi Arabia  

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  • Rupture Process of The 2011 Tohoku-Oki Earthquake Inferred by an Inversion Using 3D Strong-Motion and 2.5D Teleseismic Green's Tensor Waveforms International conference

    Taro Okamoto, Hiroshi Takenaka, Tatsuhiko Hara, Takeshi Nakamura, Takayuki Aoki

    AOGS 11th Annual Meeting  2014.7 

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    Venue:札幌, ロイトン札幌ホテル  

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  • Phase-field格子ボルツマン法による対流内でのデンドライト成長の大規模3D計算

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • Multi-GPU Parallel Computation of Dendrite Solidification with Melt Convection Using Phase-Field-Lattice Boltzmann Model International conference

    S. Sakane, T. Takaki, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    Parallel CFD 2016  2016.5 

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    Venue:Kobe, Kobe International Conference Center  

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  • 非球形固体粒子と流体の直接相互作用による混相流の大規模シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    粉体工学会 2016年度春季研究発表会  2016.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都,京都リサーチパーク  

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  • 個別要素法による実大規模土砂流動実験の再現解析

    森口周二, 太田勇真, 高瀬慎介, 寺田賢二郎, 阿部慶太, 青木尊之

    日本計算工学会 第21回計算工学講演会  2016.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • 保存系IDO法による乱流DNS

    計算工学講演会論文集  2007 

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  • 舞い落ちる多数のイチョウの葉のシミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    日本計算工学会 第21回計算工学講演会  2016.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • Conservative and non-conservative multi-moment schemes for computational fluid dynamics

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • 個別要素法を用いた大規模土砂流動実験の再現解析

    森口周二, 太田勇真, 高瀬慎介, 寺田賢二郎, 阿部慶太, 青木尊之

    第19回応用力学シンポジウム  2016.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌, 北海道大学  

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  • 垂直軸型風車周りの流れの重合格子IDO法によるシミュレーション

    計算工学講演会論文集  2007 

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  • Phase-field法と格子ボルツマン法による柱状デンドライトの透過率評価法の構築

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本計算工学会 第21回計算工学講演会  2016.5 

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    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • 部分的にセミ・ラグランジュを導入したルンゲクッタ時間積分IDO法の開発

    計算工学講演会論文集  2007 

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  • GPGPUによる超並列計算 GPGPU高速化アルゴリズムと計算事例(流体計算,樹枝状凝固成長など) Invited

    青木尊之

    鉄鋼協会 熱経済技術部会 技術検討会  2016.8 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京, 東京工業大学  

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  • Scientific Computings for Real World by TFlops Supercomputer

    2007 

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  • Evaluating power and energy consumption of FPGA-based custom computing machines for scientific floating-point computation

    International Conference on Field-Programmable Technology 2008 (ICFPT'08)  2008 

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  • Large-scale Complex Flow Simulations using Particle and Mesh Methods on a GPU supercomputer Invited International conference

    Takayuki Aoki

    WCCM XII & APCOM VI 2016  2016.7 

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    Venue:Seoul, Korea  

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  • Numerical method for liquefaction based on fluid-particle coupled analysis

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • Large-scale phase-field simulations of dendrite growth using a GPU supercomputer Invited International conference

    T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)  2016.8 

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    Venue:Kyoto, Kyoto International Conference Center  

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  • Direct numerical simulation of turbulent flows by conservative IDO scheme

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • CFD simulations using an AMR-like approach in the PDE framework Peano

    2008 

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  • Large-scale Simulations for Fluidization using Coupled Lattice Boltzmann Method and Discrete Element Method on a GPU Supercomputer International conference

    S. Watanabe, T. Aoki, Y. Hasegawa

    ECCOMAS Congress 2016  2016.6 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Crete Island, Greece  

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  • Aerodynamics Study using Locally Mesh-refined Lattice Boltzmann Method for a GPU Computation International conference

    Yuta Hasegawa, Takayuki Aoki, Hiromichi Kobayashi

    ECCOMAS Congress 2016  2016.6 

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    Venue:Crete Island, Greece  

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  • Simulation of free surface flow interacting with moving particles by using immersed boundary method

    International Conference on Violent flows 2007  2007 

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  • High-productivity Framework for Large-scale GPU/CPU Stencil Applications International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    IHPCES/ICCS 2016  2016.6 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Diego, USA  

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  • 適合細分化格子を用いた格子ボルツマン法による非球形固体粒子との直接相互作用計算に基づいた大規模混相流シミュレーション

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点 第7回 シンポジウム  2016.7 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京, THE GRAND HALL品川  

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  • Conservative interpolated differential operator (IDO) scheme

    International Conference on Recent Developments of Numerical Schemes for Flow Problems  2007 

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  • GPUを用いた粒子法・格子法による大規模流体解析

    青木尊之

    2016.7 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:愛知, 株式会社豊田中央研究所  

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  • Conservative and non-conservative multi-moment schemes for computational fluid dynamics

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • Large-Scale Particle Simulations for Debris Flows Using Dynamic Load Balance with Space Filling Curves on a GPU-RICH Supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki

    ECCOMAS Congress 2016  2016.6 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Crete Island, Greece  

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  • High-accurate computation for compressible and incompressible fluid dynamics by multi-moment conservative scheme

    The 4th Japan-Taiwan Workshop on Mechanical and Aerospace Engineering  2007 

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  • 動的負荷分散によるGPUスパコンを用いた粒子法の大規模シミュレーション手法の開発 II - 流体・構造連成計算への適用 -

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第7回 シンポジウム  2016.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, THE GRAND HALL品川  

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  • Turbulent flow computations by conservative interpolated differential operator (IDO) scheme

    International Conference on Recent Developments of Numerical Schemes for Flow Problems  2007 

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  • New discipline of collaborative research crossing borders through supercomputing infrastructure

    the 1st Thailand-Japan International Academic Conference  2008 

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  • 円筒形状における気液二相流数値計算

    日本流体力学会年会講演予稿集  2008 

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  • Large-Scale Phase-Field Computations of Dendrite Growth by GPU Supercomputer Invited International conference

    T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    USACM Conference on Isogeometric Analysis and Meshfree Methods  2016.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:San Diego, USA  

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  • GPUを用いた保存形IDO法による高精度圧縮性流体の高速計算

    日本機械学会・第21回計算力学講演会  2008 

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  • GPU スパコンによる大規模粒子法・格子法シミュレーション Invited

    青木尊之

    RIMS研究集会 現象解明に向けた数値解析学の新展開II  2016.10 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:京都, 京都大学数理解析研究所  

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  • フルGPU によるCFDアプリケーション

    日本機械学会・第21回計算力学講演会  2008 

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  • 爆風による破片飛散の大規模シミュレーション

    黄遠雄, 青木尊之, 杉山暁洋

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋, 名古屋大学  

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  • 保存型IDO 法を用いたLES 乱流計算手法

    第22回数値流体シンポジウム  2008 

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  • 保存型IDO 法を用いたPhase-Field 法による界面捕獲手法の検討

    松下真太郎, 青木尊之, 高木知弘, 相原慎太郎

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋, 名古屋大学  

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  • GPUコンピューティングによるCFDの超高速計算

    第22回数値流体シンポジウム  2008 

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  • 個別要素法による土砂流動解析の計算条件に関する一考察

    森口周二, 太田勇真, 高瀬慎介, 寺田賢二郎, 阿部慶太, 青木尊之

    第71回土木学会年次学術講演会  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台, 東北大学  

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  • 適合格子細分化法を導入した格子ボルツマン法のGPU 計算による自転車競技の空力解析

    長谷川雄太, 青木尊之, 小林宏充

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋, 名古屋大学  

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  • デンドライト沈降現象のphase-field 格子ボルツマンシミュレーション

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋, 名古屋大学  

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  • GPUによる3次元Cahn-Hilliard方程式に基づく相分離計算

    日本機械学会・第21回計算力学講演会  2008 

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  • A large-scale SPH Two-Phase Flow Simulation using Multiple GPUs

    Michael Gestrich, Takayuki Aoki, Stefan Adami, T Thomas Indinger

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Venue:Nagoya, Nagoya University  

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  • IDO 法によるPassive Scalar の乱流計算

    日本機械学会・第21回計算力学講演会  2008 

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  • LBM-DEM の直接相互作用計算による流動層の大規模シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Venue:名古屋, 名古屋大学  

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  • GPU driven acceleration for solving the shallow water equation

    2008 

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  • 大規模multi-phase-field 計算に基づく理想粒成長過程の考察

    三好英輔, 高木知弘, 坂根慎治, 大野宗一, 澁田靖, 青木尊之

    日本機械学会第29回計算力学講演会(CMD2016)  2016.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋, 名古屋大学  

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  • LES 乱流モデルを用いた保存型IDO 法によるチャネル乱流計算

    日本機械学会・第21回計算力学講演会  2008 

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  • Large-scale GPU computations of dendrite growth using phase-field method Invited International conference

    T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    IUMRS International Conference in Asia (IUMRS-ICA)  2016.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Qingdao, China  

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  • GPUを用いたCIP法によるプラズマ2流体不安定性の高速シミュレーション

    日本計算工学会・計算工学講演会論文集  2008 

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  • Performance Evaluation of Wind Simulation Based on a GPU-computing Framework to Realize Large-scale Stencil Computations Beyond Device Memory Capacity International conference

    Takashi Shimokawabe, Toshio Endo, Naoyuki Onodera, Takayuki Aoki

    The 7th AICS International Symposium  2017.2 

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    Language:English   Presentation type:Poster presentation  

    Venue:Kobe, Integrated Research Center of Kobe University  

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  • 自由表面を含む粒子群-流体連成解析

    日本計算工学会・計算工学講演会論文集  2008 

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  • GPUによるHPCアプリケーションの高速化 竏辰FD (Computational Fluid Dynamics) アプリケーション竏驤

    nVIDIA ROUND TABLE MEETING, 次世代設計開発環境 Desk-side SuperComputing with GPUs の実現  2008 

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  • 流体-固体粒子間相互作用の直接計算による大規模流動化シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    第22回流動化・粒子プロセッシングシンポジウム  2016.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 東京大学生産技術研究所  

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  • HPCにおけるGPUコンピューティング -CFDアプリケーション

    振興分野人材育成プログラム・メディア情報処理専修コース  2008 

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  • LBM の強み・弱みとGPUスパコンによる混相流シミュレーション

    青木尊之

    第26回LBM研究会  2016.12 

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    Venue:大阪, 大阪府立大学  

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  • Rise of the Commodity Vectors or Democratization of Supercomputing

    NVISION2008  2008 

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  • Effective Dynamic Load Balance using Space-Filling Curves for Large-Scale SPH Simulations on GPU-rich Supercomputers International conference

    Satori Tsuzuki, Takayuki Aoki

    SC16  2016.11 

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    Venue:Salt Lake City, USA  

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  • Daino A High-level Framework for Parallel and Efficient AMR on GPUs International conference

    Mohamed Wahib, Naoya Maruyama, Takayuki Aoki

    SC16  2016.11 

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    Venue:Salt Lake City, USA  

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  • 完全Divergence-Free形式の保存型マルチモーメント法

    日本流体力学会年会講演予稿集  2008 

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  • 弱圧縮性流体解析手法による気液二相流解析

    松下真太, 青木尊之

    第30回数値流体力学シンポジウム (CFD2016)  2016.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, タワーホール船堀  

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  • CUDA によるPoisson方程式の定常反復計算

    可視化情報シンポジウム2008  2008 

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  • 格子ボルツマン法による魚のフリー・スイミングのシミュレーション

    岩崎颯, 青木尊之, 渡辺勢也, 長谷川雄太

    第30回数値流体力学シンポジウム (CFD2016)  2016.12 

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    Venue:東京, タワーホール船堀  

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  • CUDAによる定常反復Poisson ベンチマークの高速化

    情報処理学会第115回HPC研究会  2008 

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  • 格子ボルツマン法による舞い落ちるイチョウの葉の大規模流体-構造連成シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    第30回数値流体力学シンポジウム (CFD2016)  2016.12 

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    Venue:東京, タワーホール船堀  

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  • High-accurate fluid computation by multi-moment conservative scheme

    2nd Korea-Japan Workshop on Computational Engineering  2008 

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  • A Large-scale Simulation for Blast wave-debris Interaction using a GPU Supercomputer

    黄遠雄, 青木尊之, 杉山暁洋

    第30回数値流体力学シンポジウム (CFD2016)  2016.12 

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    Venue:東京, タワーホール船堀  

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  • CUDA によるプラズマ2 流体不安定性計算の加速

    第36回可視化情報シンポジウム  2008 

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  • CFD Applications Using Adaptive Mesh and Space-Filling Curves on a GPU Supercomputer International conference

    Takayuki Aoki

    2017 SIAM Conference on Computational Science and Engineering  2017.2 

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    Venue:Atlanta, USA  

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  • Phase-field格子ボルツマン計算によるデンドライト一方向凝固組織に及ぼす自然対流の影響評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本鉄鋼協会 第173回春季講演大会  2017.3 

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    Venue:東京, 首都大学東京  

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  • Rise of the Commodity Vectors or Democratization of Supercomputing

    NVISION2008  2008 

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  • High-accurate fluid computation by multi-moment conservative scheme

    2nd Korea-Japan Workshop on Computational Engineering  2008 

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  • 格子ボルツマン法を用いたイルカのフリースイミングの数値解析

    岩崎颯, 青木尊之, 渡辺勢也, 長谷川雄太

    第22回計算工学講演会  2017.5 

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    Venue:埼玉, 大宮ソニックシティ  

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  • TSUBAME supercomputer and contribution to science and engineering

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • 自然対流を伴う二元合金一方向凝固のphase-fieldシミュレーション

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆, 青木尊之

    第22回計算工学講演会  2017.5 

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    Venue:埼玉, 大宮ソニックシティ  

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  • Numerical method for geomaterial based on fluid-particle interaction

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • 非球形粒子を含む流動層の大規模直接シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    粉体工学会2017年春季研究発表会  2017.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 早稲田大学国際会議場  

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  • GPU-based CFD for on-site real-time disaster simulation

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • 個別要素法を用いた土砂の衝撃力評価における解析条件の感度分析

    森口周二, 蛭間雄大, 高瀬慎介, 寺田賢二郎, 阿部慶太, 青木尊之

    第20回 応用力学シンポジウム  2017.5 

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    Venue:京都大学, 京都  

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  • Tsunami run-up phenomena with shallow water modeling solved by conservative IDO scheme

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • 適合細分化格子を用いた格子ボルツマン法の複数 GPU による大規模計算

    長谷川雄太, 青木尊之

    第22回計算工学講演会  2017.6 

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    Venue:埼玉, 大宮ソニックシティ  

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  • GPU driven acceleration for solving the shallow water equation

    2008 

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  • 複数GPUを用いた完全陽解法による気液二相流計算

    松下真太郎, 青木尊之

    第22回計算工学講演会  2017.6 

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    Venue:埼玉, 大宮ソニックシティ  

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  • New discipline of collaborative research crossing borders through supercomputing infrastructure

    the 1st Thailand-Japan International Academic Conference  2008 

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  • 大規模3D multi-phase-field計算に基づく2D断面上の粒成長挙動評価

    三好英輔, 高木知弘, 大野宗一, 澁田靖, 坂根慎治, 下川辺隆史, 青木尊之

    第22回計算工学講演会  2017.5 

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    Venue:埼玉, 大宮ソニックシティ  

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  • Evaluating power and energy consumption of FPGA-based custom computing machines for scientific floating-point computation

    International Conference on Field-Programmable Technology 2008 (ICFPT'08)  2008 

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  • 流体-粒子間相互作用の直接計算に基づく非球形粒子を含む流動層シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太

    第22回計算工学講演会  2017.6 

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    Venue:埼玉, 大宮ソニックシティ  

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  • CFD simulations using an AMR-like approach in the PDE framework Peano

    2008 

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  • A Large-scale Simulation for Blastwave-debris Interaction using a GPU Supercomputer

    Un-Hong Wong, Takayuki Aoki, Akihiro Sugiyama

    JSCES2017  2017.6 

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    Venue:Saitama, Omiya Sonic City  

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  • Towards large-scale parallel GPU-accelerated SPH for FSI problems

    Michael Gestrich, Stefan Adami, Takayuki Aoki, Thomas Indinger

    JSCES2017  2017.6 

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    Venue:Saitama, Omiya Sonic City  

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  • GPU-based CFD for on-site real-time disaster simulation

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • 高精細計算を実現するAMR法フレームワークの開発

    下川辺隆史, 青木尊之, 小野寺直幸

    第22回計算工学講演会  2017.6 

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    Venue:埼玉, 大宮ソニックシティ  

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  • 空間充填曲線を用いた動的負荷分散による大規模粒子法シミュレーション

    青木尊之

    フォーラム「粒子法による流体シミュレーションの並列化技術」  2017.8 

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    Venue:福岡, 九州大学  

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  • 自由界面流れと固体粒子の連成シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太, 松下真太郎

    混相流シンポジウム2017  2017.8 

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    Venue:東京, 電気通信大学  

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  • GPUスパコンによる粉体・混相流の大規模シミュレーション

    青木尊之

    第1回 計算粉体力学研究会  2017.7 

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    Venue:京都, 同志社大学  

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  • 自由界面流れと固体粒子の連成シミュレーション

    渡辺勢也, 青木尊之, 長谷川雄太, 松下真太郎

    混相流シンポジウム2017  2017.8 

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    Venue:東京, 電気通信大学  

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  • Phase-field study on the comparison of grain growth microstructures from three-dimensional and cross-sectional observations International conference

    E. Miyoshi, T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    10th Pacific Rim International Conference on Modeling of Casting and Solidification Processes (MCSP2017)  2017.8 

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    Venue:Beijing, China  

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  • 2D and 3D phase-field lattice Boltzmann simulations during directional solidification of a binary alloy with natural convection International conference

    T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    10th Pacific Rim International Conference on Modeling of Casting and Solidification Processes (MCSP2017)  2017.8 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Beijing, China  

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  • 弱圧縮性流体解析手法に基づく完全陽解法による気液二相流のGPU 計算

    松下真太郎, 青木尊之

    混相流シンポジウム2017  2017.8 

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    Venue:東京, 電気通信大学  

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  • Influence of forced flow on the oriented equiaxed dendrititic growth large-scale phase-field study International conference

    S. Sakane, T. Takaki, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    10th Pacific Rim International Conference on Modeling of Casting and Solidification Processes (MCSP2017)  2017.8 

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    Venue:Beijing, China  

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  • 適合細分化格子を用いた格子ボルツマン法による非球形固体粒子との直接相互作用計算に基づいた大規模混相流シミュレーション

    青木尊之

    学際大規模情報基盤共同利用・共同研究拠点第9回 シンポジウム  2017.7 

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    Venue:東京, THE GRAND HALL品川  

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  • Large-scale Multiphase Flow Simulations on a GPU Supercomputer International conference

    Takayuki Aoki

    The 24th National Computational Fluid Dynamics Conference  2017.8 

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    Venue:Hsinchu, Taiwan  

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  • 重合格子法を用いた垂直軸型風車周り流れのGPUシミュレーション

    杉原健太, 青木尊之

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • Phase-field 法による界面捕獲手法を用いた自由界面流 れと固体粒子の連成解析

    渡辺勢也, 青木尊之, 長谷川雄太, 松下真太郎

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • A Stencil Framework to Realize Large-scale Computations Beyond Device Memory Capacity on GPU Supercomputers International conference

    Takashi Shimokawabe, Toshio Endo, Naoyuki Onodera, Takayuki Aoki

    2017 IEEE International Conference on Cluster Computing (CLUSTER)  2017.9 

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    Venue:Honolulu, HI, USA  

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  • GPUスパコンによる高レイノルズ数の気液・固液二相流の大規模シミュレーション

    青木尊之

    第12回 名工大・核融合研 共同セミナー  2017.9 

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    Venue:愛知, 名古屋工業大学  

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  • 格子ボルツマン法によるイルカのフリースイミングのシミュ レーション

    岩崎颯, 青木尊之, 渡辺勢也, 長谷川雄太

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • 適合格子細分化法を導入した格子ボルツマン法の複数 GPU 計算による非圧縮流れの空力解

    長谷川雄太, 青木尊之

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • 弱圧縮性近似による気液二相流の直交格子ベース陽解法

    松下真太郎, 青木尊之

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • 大規模 phase-field シミュレーションの現状

    高木知弘, 大野宗一, 澁田靖, 坂根慎治, 三好英輔, 下川辺隆史, 青木尊之

    第30回 計算力学講演会  2017.9 

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    Venue:大阪, 近畿大学  

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  • 断面観察からの立体的結晶粒組織の推定に関するPhase-Field法による研究

    三好英輔, 高木知弘, 大野宗一, 澁田靖, 坂根慎治, 青木尊之

    日本鉄鋼協会 第174回秋期講演大会  2017.9 

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    Venue:北海道  

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  • 3D大規模Phase-field格子ボルツマン計算によるデンドライト一方向凝固組織に及ぼす自然対流の影響評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木 尊之

    日本鉄鋼協会 第174回秋期講演大会  2017.9 

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    Venue:北海道  

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  • 大規模物理シミュレーションのレイトレーシング可視化

    青木尊之

    「新生」第11回金沢コンピュータグラフィックス談話会  2017.12 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:石川, 富士通株式会社 北陸支社  

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  • 保存形フェースフィールド方程式によるAMR 法を用いた界面移流計算の動的メモリ管理によるGPU実装

    黄遠雄, 青木尊之, 松下真太郎

    第31回 数値流体力学シンポジウム (CFD2017)  2017.12 

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    Venue:京都, 京都工芸繊維大学  

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  • Large-scale gas-liquid/gas-solid two-phase flow simulations on a GPU supercomputer

    Takayuki Aoki

    ITCPS2017  2017.10 

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    Venue:Tokyo, Tokyo Institute of Technology  

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  • High Productivity GPU Porting Framework Applied to Japanese Weather Prediction Model International conference

    Michel Muller

    WACCPD 2017  2017.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Denver, USA  

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  • 界面に適合するAMR法を用いた気液二相流の完全陽解法計算

    松下真太郎, 青木尊之

    第31回 数値流体力学シンポジウム (CFD2017)  2017.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都, 京都工芸繊維大学  

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  • 適合格子細分化法を導入した格子ボルツマン法による複雑形状物体周りの流れの複数GPU計算

    長谷川雄太, 青木尊之

    第31回 数値流体力学シンポジウム (CFD2017)  2017.12 

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    Venue:京都, 京都工芸繊維大学  

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  • デンドライトの成長と運動の大規模phase-fieldシミュレーション

    坂根慎治, 高木知弘, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    第31回 数値流体力学シンポジウム (CFD2017)  2017.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都, 京都工芸繊維大学  

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  • Towards large-scale parallel GPU-accelerated SPH for FSI problems International conference

    M. Gestrich, S. Adami, T. Aoki, T. Indinger

    PARTICLES2017  2017.9 

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    Venue:Hannover, Germany  

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  • GPUスパコンによる大規模・気液二相流・流動層シミュレーション

    青木尊之

    第9回ホットな話題の講習会  2017.10 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:東京, 東京理科大学森戸記念館  

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  • Large-scale Simulations for Fluid-particle Systems Using Coupled LBM-DEM on a GPU Supercomputer International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    PARTICLES2017  2017.9 

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    Venue:Hannover, Germany  

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  • 格子細分化を導入したD3Q27格子ボルツマン法のGPU実装

    長谷川雄太, 青木尊之, 小野寺直幸

    第28回数値流体力学シンポジウム  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 船堀タワーホール  

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  • 適合細分化格子を用いた複数GPUによる圧縮性流体計算

    藤山崇紘, 青木尊之

    第28回数値流体力学シンポジウム  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 船堀タワーホール  

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  • Tsunami Hazard Simulation in Indian Ocean Coasts I - Wide-area Simulation with Fine Mesh Adaptation -

    Marlon Arce Acuna, Takayuki Aoki, Kiyoshi Honda

    第28回数値流体力学シンポジウム  2014.12 

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    Venue:東京, 船堀タワーホール  

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  • GPUスパコンにおける動的負荷分散を用いた粒子法による大規模流体シミュレーション

    都築怜理, 青木尊之

    第28回数値流体力学シンポジウム  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 船堀タワーホール  

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  • GPUスハ?コンによる格子に基つ?いたシミュレーションのためのGPUコンヒ?ューティンク?・フレームワーク

    下川辺隆史, 青木尊之, 小野寺直幸

    AXIES大学ICT推進協議会 2014年度年次大会  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台, AERビル  

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  • 7点ステンシル計算(拡散方程式)に対する GPUとMIC の実行性能比較

    藤山崇紘, 青木尊之

    首都大学東京ミニ研究環ワークショップ「メニーコアシステムにおける格子アプリケーション-GPUとMICの実行性能比較-」  2014.12 

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    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:東京, 首都大学東京秋葉原サテライトキャンパス  

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  • ステンシル計算のための GPU コンピューティング・フレームワークのチューニング高度化

    下川辺隆史, 青木尊之, 小野寺直幸

    第205回ARC・第147回HPC合同研究発表会(HOKKE-22)  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:小樽, 小樽経済センターホール  

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  • GPUによる近接相互作用に基づく粒子計算の近傍探索手法

    渡辺勢也, 青木尊之, 都築怜理, 下川辺隆史

    第205回ARC・第147回HPC合同研究発表会(HOKKE-22)  2014.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:小樽, 小樽経済センターホール  

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  • Large-scale stencil and particle applications and their performances on a GPU supercomputer International conference

    Takayuki Aoki

    Workshop on Recent Advances in Parallel and High Performance Computing Techniques and Applications  2015.1 

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    Venue:Singapore, National University of Singapore  

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  • A GPU Direct-MPI Hybrid Parallel and Its Application to Large-scale Global MHD Simulation and In-Situ Visualization on Distributed Multi-GPU Systems

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    Annual Meeting on Advanced Computing System and Infrastructure (ACSI) 2015  2015.1 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • Seismically Inferred Rupture Process of the 2011 Tohoku-Oki Earthquake by Using Data-Validated 3D and 2.5D Green's Tensor Waveforms International conference

    Taro Okamoto, Hiroshi Takenaka, Tatsuhiko Hara, Takeshi Nakamura, Takayuki Aoki

    American Geophysical Union Fall Meeting  2014.12 

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    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco, USA  

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  • IDO法によるコロケート格子での流体計算に対する流速と圧力の安定なカップリング手法

    日本機械学会 第18回計算力学講演会  2005 

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  • サスペンション・フローの超大規模シミュレーション

    都築怜理, 青木尊之

    粉体工学会2015年度春期研究発表会  2015.5 

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    Venue:東京, 連合会館  

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  • A universal solver for hyperbolic equations by cubic-polynomial interpolation

    Computer Physics communications  1991 

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  • 大規模シミュレーションによる沈み込み帯地震からの短周期表面波の再現性検討

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地球惑星科学連合2015年大会  2015.5 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:千葉, 幕張メッセ国際会議場  

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  • Interpolated Differential Operator(IDO)Scheme for Solving Partial Differential Equations

    Computer Physics Communication  1997 

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  • 非球形粒子を用いた個別要素法による大規模粉体シミュレーション

    渡辺勢也, 青木尊之, 都築怜理

    粉体工学会2015年度春期研究発表会  2015.5 

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    Venue:東京, 連合会館  

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  • 動的領域分割を用いた流体構造連成によるサスペンション・フローの大規模 GPU 計算

    都築怜理, 青木尊之

    2015年ハイパフォーマンスコンピューティングと計算科学シンポジウム, P111-119  2015.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京, 東京大学 武田ホール  

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  • A universal solver for hyperbolic equations by cubic-polynomial interpolation

    Computer Physics communications  1991 

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  • GPUを用いた個別要素法計算における近傍探索手法の比較評価

    渡辺勢也, 青木尊之, 都築怜理, 下川辺隆史

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • 保存形IDO法

    第19回数値流体シンポジウム  2005 

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  • グリッドコンピューティングによる気泡流シミュレーションの可視化

    日本機械学会・第18回計算力学講演会  2005 

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  • GPUスパコンによる大規模流体・粒子シミュレーション Invited

    青木尊之

    2015年度 放電学会シンポジウム  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京, ロイヤルブルーホール  

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  • Interpolated Differential Operator(IDO)Scheme for Solving Partial Differential Equations

    Computer Physics Communication  1997 

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  • 複数GPUを用いた気液分離装置のシミュレーション

    泉田康太, 青木尊之, 小野寺直幸, 杉原健太, 中島聖, 本郷均, 横畑 英明

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • コロケート格子における流速と圧力の安定なカップリング手法を用いたIDO法(IDO-SC法)

    第19回数値流体シンポジウム  2005 

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  • 浅水波方程式の高精度スキームによる安定な遡上シミュレーション

    杉山暁洋, 青木尊之, 本多潔

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • CIP法およびIDO法の計算精度

    日本機械学会年次大会  2005 

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  • 垂直軸型風車付き津波避難タワーに対する津波波圧の数値解析

    杉原健太, 青木尊之, 内山久和

    第20回計算工学講演会  2015.6 

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    Venue:つくば, つくば国際会議場  

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  • AMRを用いた衝撃波による構造物飛散の数値シミュレーション

    日本機械学会年次大会  2005 

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  • 格子ボルツマン法における適合細分化格子のGPU実装

    長谷川雄太, 青木尊之, 小野寺直幸

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • GPUスパコンにおける動的負荷分散を用いた大規模流体構造連成シミュレーション

    都築怜理, 青木尊之

    第20回計算工学講演会  2015.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば, つくば国際会議場  

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  • Large-scale SPH Simulations using Dynamic Load Balance on a GPU Supercomputer International conference

    S.Tsuzuki, T.Aoki

    Computational Methods in Marine Engineering (Marine 2015)  2015.6 

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    Venue:National Research Council(CNR), Italy  

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  • 鉛直狭隘流路内大規模気泡流に関する数値的可視化

    可視化情報学会  2005 

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  • GPU phase-field lattice Boltzmann simulations of growth and motion of binary alloy dendrite International conference

    T. Takaki, R. Rojas, M. Ohno, T. Shimokawabe, T. Aoki

    Modeling of Casting, Welding and Advanced Solidification Processes (MCWASP XIV 2015)  2015.6 

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    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Awaji, Yumebutai International Conference Center  

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  • 爆風による構造物の破壊・飛散に対する新しい数値シミュレーション手法(I)

    2005 

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  • 多結晶粒成長過程における析出物によるピンニングの大規模マルチフェーズフィールドシミュレーション

    岡本成史, 山中晃徳, 下川辺隆史, 青木尊之

    第20回計算工学講演会  2015.6 

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    Venue:つくば, つくば国際会議場  

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  • 微小流路以内大規模気泡流構造に関する数値予測

    日本機械学会年次大会  2005 

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  • Numerical method for geomaterial based on fluid-particle interaction

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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  • GPUによるメッシュ系CFDの超高速計算

    東京大学 弥生研究会「粒子法研究会」  2009 

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  • Large-scale Debris-blastwave Interaction Simulation using GPU supercomputer International conference

    Un-Hong Wong, Takayuki Aoki, Akihiro Sugiyama

    COUPLED PROBLEMS 2017  2017.6 

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    Venue:Rhodes Island, Greece  

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  • Numerical method for geomaterial based on fluid-particle interaction

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • Development of Tsunami database in Thailand through supercomputing research collaboration

    The 20th Annual Conference the Japan Society for International Development  2009 

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  • A large-scale LBM-DEM simulation based on direct calculation of fluid-solid interactions using multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    COUPLED PROBLEMS 2017  2017.6 

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    Venue:Rhodes Island, Greece  

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  • Large-scale Mesh-Refined Multi-GPU Accelerated Tsunami Simulation on a Real Indian Ocean Scenario

    Marlon Arce Acuna, Takayuki Aoki, Akihiro Sugiyama

    JSCES2017  2017.6 

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    Venue:Saitama, Omiya Sonic City  

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  • Tsunami run-up phenomena with shallow water modeling solved by conservative IDO scheme

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • Large-Scale Simulations For Multiphase Flows By Coupled LBM-DEM Using Multiple GPUs International conference

    Seiya Watanabe, Takayuki Aoki, Yuta Hasegawa

    DSFD2017  2017.6 

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    Venue:Erlangen, Germany  

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  • TSUBAME supercomputer and contribution to science and engineering

    2nd International Workshop on Numerical Simulation for Disastrous Phenomena  2008 

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  • Green Supercomputer TSUBAME and Large-scale Applications on Computational Fluid Dynamics International conference

    Takayuki Aoki

    ASPIRE FORUM 2017  2017.6 

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    Venue:Nanyang Technological University, Singapore  

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  • 姫野ベンチマークのGPUマルチノード実行における通信と演算のオーバーラップによる高速化 ~ 32GPUで700GFLOPS超を達成 ~

    HPC研究会  2009 

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  • GPU driven acceleration for solving the Shallow Water Equation

    15th International Conference on Finite Elements in Flow Problems  2009 

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  • Lattice Boltzmann Simulations Coupled with Octree-based Locally-refined Mesh using Space-filling Curves International conference

    Yuta Hasegawa, Takayuki Aoki

    COUPLED PROBLEMS 2017  2017.6 

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    Venue:Rhodes Island, Greece  

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  • マルチGPUノードにおける3次元Phase Fieldモデルの高速計算

    日本機械学会第22回計算力学講演会  2009 

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  • A two-phase flow simulation based on weakly compressible flow scheme coupled with conservative phase-field method International conference

    Shintaro Matsushita, Takayuki Aoki

    COUPLED PROBLEMS 2017  2017.6 

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    Venue:Rhodes Island, Greece  

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  • GPU accelerated computing窶吐rom hype to mainstream, the rebirth of vector computing

    Scientific Discovery through Advanced Computing (SciDAC 2009)  2009 

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  • ベクトル型スパコンのアプリケーションを侵食する GPGPU竏竪PGPUによるCFDの超高速計算竏驤

    MSSG-CRESTセミナー  2009 

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  • CUDAを用いたGPUによる非圧縮性流体計算の高速化

    2009年ハイパフォーマンスコンピューティングと計算科学シンポジウム  2009 

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    Presentation type:Poster presentation  

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  • Development of Tsunami database in Thailand through supercomputing research collaboration

    The 20th Annual Conference the Japan Society for International Development  2009 

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  • GPU Comuting for 3-D Phase Field Model on Multi-GPU cluster

    JSME 22nd Computational Mechanics Conference (CMD2009)  2009 

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  • CUDAを用いたGPUによる3次元Cahn-Hilliard方程式の高速計算

    2009年ハイパフォーマンスコンピューティングと計算科学シンポジウム  2009 

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    Presentation type:Poster presentation  

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  • Real-time tsunami simulation by using GPU

    The Second International Conference on Geoinformation Technology for Natural Disaster Management and Rehabilitation  2009 

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  • Real-time tsunami simulation by using GPU

    The Second International Conference on Geoinformation Technology for Natural Disaster Management and Rehabilitation  2009 

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  • High Performance Computing of Phase-Field Simulation for Phase Transformation in Steel by GPU

    The 2nd International Symposium on Cutting Edge of Computer Simulation of Solidificatio  2010 

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  • GPU accelerated computing窶吐rom hype to mainstream, the rebirth of vector computing

    Scientific Discovery through Advanced Computing (SciDAC 2009)  2009 

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  • GPU driven acceleration for solving the Shallow Water Equation

    15th International Conference on Finite Elements in Flow Problems  2009 

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  • Multi-GPU Scalability of Phase-Field Simulation for Phase Transition - 5 Tera Flop/s Performance on 40 GPUs -

    High Performance Computing Symposium 2010  2010 

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  • Peta-scale GPU applications on TSUBAME2.0 Invited International conference

    Takayuki Aoki

    The Salishan Conference on High-Speed Computing 2012  2012.4 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Gleneden Beach, OR  

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  • マルチGPU によるフェーズフィールド相転移計算のスケーラビリティー ~ 40 GPU で 5 TFLOPS の実効性能 ~

    2010年ハイパフォーマンスコンピューティングと計算科学シンポジウム  2010 

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  • GPUを用いたLocal Mesh Refinement法によるLES解析/Local mesh refinement for large eddy simulation with GPU

    小野寺直幸, 青木尊之

    第17回 計算工学講演会  2012.5 

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    Venue:京都  

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  • マルチモーメント法に基づく爆風シミュレーションの大規模GPU計算

    黒木雅広, 青木尊之

    第17回 計算工学講演会  2012.5 

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    Venue:京都  

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  • A 2-Petaflops Stencil Application with Stereoscopic 3D Visualization - Gordon Bell Prize 2011 Invited International conference

    Takayuki Aoki

    GTC 2012  2012.5 

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    Venue:San Jose  

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  • GPU スパコン TSUBAME 2.0 によるフェース?フィールト? 法を用いた 2 petaflops 樹枝状凝固成長計算

    下川辺隆史, 青木尊之, 高木知弘, 山中晃徳, 額田彰

    第17回 計算工学講演会  2012.5 

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    Venue:京都  

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  • Peta-scale GPU Computing of Phase-Field Simulation for Dendritic Solidification on the TSUBAME 2.0 supercomputer International conference

    Takashi Shimokawabe, Takayuki Aoki, Tomohiro Takaki, Akinori Yamanaka, Akira Nukada

    The 10th WORLD CONGRESS ON COMPUTATIONAL MECHANICS (WCCM 2012)  2012.7 

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    Venue:Sao Paulo, Brazil  

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  • パッシブスカラー粒子の大規模 GPU 計算

    都築怜理, 青木尊之, 王 嫻, 宮下達路

    第17回 計算工学講演会  2012.5 

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    Venue:京都  

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  • Passive scalar computation of billion particles on a GPU supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki, Takashi Shimokawabe, Wang Xian

    The 10th WORLD CONGRESS ON COMPUTATIONAL MECHANICS (WCCM 2012)  2012.7 

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    Venue:Sao Paulo  

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  • Al-Si 二元合金のGPUスパコンによる樹枝状凝固シミュレーション

    青木尊之

    第25回計算力学講演会, 日本機械学会  2012.10 

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    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:神戸  

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  • 複数 GPU を用いた大規模粒子計算の動的負荷分散

    都築怜理, 青木尊之

    第25回 計算力学講演会  2012.10 

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    Venue:神戸  

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  • 流体解析・電磁界解析に適したGPUコンピューティングと大規模計算化 Invited

    青木尊之, 下川辺隆史, 小野寺直幸

    電子情報通信学会, 2012年ソサエティ大会  2012.9 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:富山  

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  • Large-Scale Simulation of Violent Flow Impacting on an Obstacle International conference

    Naruhiko Tan, Takayuki Aoki, Changhong Hu, Makoto Sueyoshi

    2nd International Conference on Violent Flows  2012.9 

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    Venue:Nantes, France  

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  • TSUBAME 2.0 によるペタ・スケール格子系アプリケーション Invited

    青木尊之

    理研シンポジウム「ペタフロップス・マシンのアプリケーション〜その使い方とは〜」  2012.10 

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    Venue:理化学研究所  

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  • GPUスパコンにおけるフェーズフィールド法による樹枝状凝固成長の大規模シミュレーション

    青木尊之, 下川辺隆史

    物性研究所 計算物質科学研究センター 第2回シンポジウム  2012.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学・物性研究所  

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  • 複数 GPU による Local Mesh Refinement 法を用いたチャネル乱流のLES解析

    小野寺直幸, 青木尊之

    第25回 計算力学講演会  2012.10 

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    Venue:神戸  

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  • GPUを用いた格子ボルツマン法に対するコヒーレント構造Smagorinskyモデルの開発

    小野寺直幸, 青木尊之, 小林宏充

    第25回 計算力学講演会  2012.10 

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    Venue:神戸  

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  • Large-scale stencil applications using the whole TSUBAME2.0 resources Invited International conference

    Takayuki Aoki

    7th IAPR International Conference on Pattern Recognition in Bioinformatics (PRIB 2012)  2012.11 

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    Venue:Tokyo  

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  • 格子ボルツマン法による1m格子を用いた都市部10km四方の大規模LES気流シミュレーション

    小野寺直幸, 青木尊之, 下川辺隆史, 小林宏充

    情報処理学会ハイパフォーマンスコンピューティング研究会主催HPCSシンポジウム2013  2013.1 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東工大  

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  • フ?ロック AMR 法の GPU コンヒ?ューティンク?・フレームワーク

    下川辺隆史, 青木尊之, 小野寺直幸

    情報処理学会ハイパフォーマンスコンピューティング研究会主催HPCSシンポジウム2013  2013.1 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 3次元グリーンテンソル波形によるインバージョンで推定した2011年東北地方太平洋沖地震の破壊過程

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地球惑星科学連合2013年大会  2013.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉県幕張市  

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  • GPU Computing and HPC Applications on a GPU-rich Supercomputer International conference

    Takayuki Aoki

    Annual Meeting of TWSIAM  2013.6 

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    Venue:Providence University (Taichung), Taiwan  

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  • A Peta-scale LES (Large-Eddy Simulation) for Turbulent Flows Based on Lattice Boltzmann Method International conference

    Takayuki Aoki

    GPU Technology Conference 2013  2013.3 

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    Venue:San Jose  

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  • 地震学における大規模・高性能GPU計算

    岡元太郎, 竹中博士, 青木尊之

    日本地球惑星科学連合2013年大会  2013.5 

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    Venue:千葉県幕張市  

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  • 最新マルチコアにおける圧縮性流体計算 〜GPUとMICの比較〜

    藤山崇紘, 青木尊之, 小野寺直幸, 下川辺隆史

    日本計算工学会  2013.6 

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    Venue:東京大学生産技術研究所  

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  • GPU による1 億個の粒子を用いた大規模個別要素法シミュレーション

    都築怜理, 青木尊之, 下川辺隆史, 小野寺直幸

    第18回計算工学講演会  2013.6 

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    Venue:東京  

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  • GPU スパコンにおける 大規模粒子法計算の動的負荷分散

    都築怜理, 青木尊之, 下川辺隆史, 小野寺直幸

    第18回計算工学講演会  2013.6 

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    Venue:東京  

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  • Efficient CFD/MHD Simulation for Distributed Multi-GPU System using GPU Direct 2.0

    Un-Hong Wong, Takayuki Aoki, Hon-Cheng Wong

    JSCES2013  2013.6 

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    Venue:Tokyo  

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  • A Turbulent Air Flow Simulation in Metropolitan Tokyo for 10km x 10km area with 1m resolution and Several Peta-scale Real-world Simulations on TSUBAME 2.0 Invited International conference

    Takayuki Aoki

    Workshop: Big Data and CFD Simulation on TSUBAME 2.0  2013.7 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:A*STAR Computational Resource Centre (A*CRC), Singapore  

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  • Dendrite competitive growth by large-scale phase-field simulations using GPU supercomputer Invited International conference

    T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    The 3rd International Workshops on Advances in Computational Mechanics (IWACOM-III)  2015.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Tokyo, KFC Hall & Rooms  

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  • Dynamic domain decomposition using space-filling curves for large-scale computational mechanics applications

    Takayuki Aoki, Satori Tsuzuki, Yuta Hasegawa

    The 3rd International Workshops on Advances in Computational Mechanics  2015.10 

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    Venue:Tokyo, KFC Hall & Rooms  

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  • 適合細分化格子LBMによる複雑形状物体周りの流れのLES計算

    長谷川雄太, 青木尊之

    第28回 計算力学講演会  2015.10 

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    Venue:横浜, 横浜国立大学  

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  • GPUによる実形状粉?体モデルを用いた大規模 DEM シミュレーション

    渡辺勢也, 青木尊之, 都築怜理

    日本機械学会 第28回計算力学講演会(CMD2015)  2015.10 

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    Venue:横浜, 横浜国立大学  

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  • Phase-field studies of dendrite growth with natural convection International conference

    T. Takaki, R. Rojas, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    The 8th International Workshop on Modeling in Crystal Growth (IWMCG-8)  2015.11 

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    Venue:Spa, Belgium  

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  • Advanced High-productivity Framework for Stencil Applications on GPU Supercomputers International conference

    Takashi Shimokawabe, Takayuki Aoki, Naoyuki Onodera

    The 3rd International Workshops on Advances in Computational Mechanics  2015.10 

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    Venue:Tokyo, KFC Hall & Rooms  

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  • 2011年東北地方太平洋沖地震の不均質構造モデルを用いた破壊過程解析(5) 相互相関係数による考察

    岡元太郎, 竹中博士, 原辰彦, 中村武史, 青木尊之

    日本地震学会秋季大会  2015.10 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:神戸, 神戸国際会議場  

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  • 可動分散粒子によるピンニングを考慮した多結晶粒成長の3次元マルチフェーズフィールドシミュレーション

    岡元成史, 山中晃徳, 下川辺隆史, 青木尊之

    第28回 計算力学講演会  2015.10 

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    Venue:横浜, 横浜国立大学  

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  • 液相流動を伴うデンドライト成長の大規模phase-field lattice Boltzmannシミュレーション

    高木知弘, 坂根慎治, Rojas Roberto, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    第28回 計算力学講演会  2015.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜, 横浜国立大学  

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  • Large-scale Particle-based Simulations for Granular and Fluid Dynamics using Dynamic Load Balance on a GPU supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki

    PARTICLES2015  2015.9 

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    Venue:Barcelona, Spain  

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  • Beyond Peta-scale on Stencil and Particle-based GPU Applications Invited International conference

    Takayuki Aoki

    SPPEXA Annual Plenary Meeting  2016.1 

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    Venue:Munich, Germany  

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  • Large-scale physics-based simulations and scientific visualizations Invited International conference

    Takayuki Aoki

    The Visualisation, Big Data, Art and Science Festival 2016  2016.2 

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    Venue:Brisbane, Queensland  

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  • Advanced GPU Direct-MPI Hybrid Framework with Block-Based Data Structure for E cient AMR on Multi-GPU Systems

    Un-Hong Wong, Takayuki Aoki

    第29回数値流体力学シンポジウム  2015.12 

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    Venue:Fukuoka, Kyushu University  

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  • GPUスパコンを用いた格子ボルツマン法/有限体積法/粒子法による大規模流体シミュレーション Invited

    青木尊之

    日本機械学会 第28回バイオエンジニアリング講演会  2016.1 

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    Venue:東京, 東京工業大学  

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  • Large-scale Complex Flow Simulations on a GPU Supercomputer International conference

    Takayuki Aoki

    KAUST-GSIC Symposium on Hierarchical Solvers for Complex Flow Simulation  2016.2 

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    Venue:King Abdullah University of Science and Technology, Saudi Arabia  

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  • Advanced GPU Direct-MPI Hybrid Framework for Efficient CFD/MHD Simulations with AMR on Multi-GPU Systems International conference

    Un-Hong Wong, Takayuki Aoki

    KAUST-GSIC Symposium on Hierarchical Solvers for Complex Flow Simulation  2016.2 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:King Abdullah University of Science and Technology, Saudi Arabia  

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  • LBM-DEM固液二相流のGPU計算

    渡辺勢也, 青木尊之, 長谷川雄太

    第29回数値流体力学シンポジウム  2015.12 

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    Venue:福岡, 九州大学  

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  • Octree細分化格子を導入した格子ボルツマン法による乱流のGPU計算

    長谷川雄太, 青木尊之, 小林宏充

    第29回数値流体力学シンポジウム  2015.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡, 九州大学  

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  • Multi-GPU parallelization for 3D phase-field-lattice Boltzmann simulations of dendritic growth in forced convection International conference

    S. Sakane, T. Takaki, R. Rojas, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki

    The 8th International Workshop on Modeling in Crystal Growth (IWMCG-8)  2015.11 

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    Venue:Spa, Belgium  

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  • GPU スパコンによる粒子法・格子法の大規模シミュレーション Invited

    青木尊之

    東北地区応用力学フォーラム ?計算力学コロキウム ?  2015.11 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:仙台, 東北大学  

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  • Large-Scale Simulations for Fluid-particle System Using Multiple GPUs International conference

    S. Watanabe, T. Aoki, Y. Hasegawa

    Parallel CFD 2016  2016.5 

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    Venue:Kobe, Kobe International Conference Center  

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  • Advanced GPU Direct-MPI Hybrid Framework with Block-Based Data Structure for Efficient CFD/MHD Simulations Using AMR on Multi-GPU Systems International conference

    Un-Hong Wong, T. Aoki

    Parallel CFD 2016  2016.5 

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    Venue:Kobe, Kobe International Conference Center  

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  • Parallel Smoothed Particle Hydrodynamics on aGPU Supercomputer International conference

    M. Gestrich, S. Adami, T. Aoki, T. Indinger

    Parallel CFD 2016  2016.5 

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    Venue:Kobe, Kobe International Conference Center  

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  • Large-Scale Particle-Based Simulations UsingDynamic Load Balance with Space Filling Curveson a GPU Supercomputer International conference

    S. Tsuzuki, T. Aoki

    Parallel CFD 2016  2016.5 

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    Venue:Kobe, Kobe International Conference Center  

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  • Large-scale 3D Phase-field Studies of Competitive Grain Growth during Directional Solidification Invited International conference

    T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki

    The 4rd International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR2016)  2016.5 

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    Venue:Xian, China  

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  • Numerical study on the tsunami impact pressure for structures using a VOF-based two-phase solver on a GPU supercomputer International conference

    Kenta Sugihara, Takayuki Aoki

    Violent Flows 2016  2016.3 

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    Venue:Osaka, I-site Namba  

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  • 大規模phase-field計算による単結晶二元合金一方向凝固過程の一次枝配列挙動評価

    高木知弘, 坂根慎治, 大野宗一, 澁田靖, 下川辺隆史, 青木尊之

    日本鉄鋼協会第171回春季講演大会  2016.3 

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    Venue:東京, 東京理科大学  

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  • GPUによる高コスパCAE Invited

    青木尊之

    非線形CAE協会シンポジウム  2016.3 

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    Venue:名古屋, ウインクあいち・愛知県産業労働センター  

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  • Large-scale Particle-based Simulations for Debris Flows using Dynamic Load Balance on a GPU Supercomputer International conference

    Satori Tsuzuki, Takayuki Aoki

    Violent Flows 2016  2016.3 

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    Venue:Osaka, I-site Namba  

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  • 災害・ものづくり系シミュレーションとスパコンからのイノベーション Invited

    青木尊之

    平成27年度地球シミュレータ利用報告会  2016.3 

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    Venue:東京, コクヨホール  

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  • 適合格子細分化法を導入した格子ボルツマン法の複数GPU計算

    長谷川雄太, 青木尊之

    日本計算工学会 第21回計算工学講演会  2016.6 

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    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • Scientific Computings for Real World by TFlops Supercomputer

    2007 

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  • A GPU implementation for high performance stencil calculations on an adaptively refined mesh

    Anna Brown, Takashi Shimokawabe, Aoki Takayuki

    JSCES2016  2016.6 

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    Venue:Niigata, TOKI MESSE  

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  • Accuracy study of the IDO-CF scheme by Fourier analysis

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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  • Large-scale Debris Flow Simulations using Particle-based Method with Dynamic Load Balance on a GPU supercomputer

    Satori Tsuzuki, Takayuki Aoki

    JSCES2016  2016.5 

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    Venue:Niigata, TOKI MESSE  

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  • Numerical method for liquefaction based on fluid-particle coupled analysis

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • GPU デバイスメモリを超える計算を可能とするためのステンシル計算フレームワークの拡張とその性能評価

    下川辺隆史, 遠藤敏夫, 青木尊之

    日本計算工学会 第21回計算工学講演会  2016.6 

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    Venue:新潟,朱鷺メッセ 新潟コンベンションセンター  

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  • Direct numerical simulation of turbulent flows by conservative IDO scheme

    Proceedings of the International Conference on Computational Methods 2007  2007 

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  • Numerical simulation for vertical-axis wind turbine by high-accurate overset grid method

    The Third Asian-Pacific Congress on Computational Mechanics and the Eleventh International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science (APCOM'07 in conjunction with EPMESC)  2007 

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Awards

  • 令和元年度(平成31年度)HPCI利用研究課題優秀成果賞

    2020.10   一般財団法人高度情報科学技術研究機構  

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  • 平成30年度 HPCI利用研究課題優秀成果賞

    2019.11   一般財団法人高度情報科学技術研究機構  

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  • 日本機械学会・計算力学部門 功績賞

    2019.9   日本機械学会  

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  • 日本計算工学会論文集 2018年度論文賞

    2019.5   日本計算工学会  

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  • 日本計算工学会 第23回計算工学講演会ベストペーパーアワード

    2018  

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  • Best Paper Award

    2018   Asian CFD Conference 2018  

    Yos Sitompul, Takayuki Aoki

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  • 国際会議 SC16 最優秀論文賞

    2016  

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  • 日本計算工学会 第21回計算工学講演会グラフィクスアワード特別賞

    2016  

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  • 第29回数値流体力学シンポジウム ベストCFDグラフィックスアワード動画部門第2位

    2015  

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  • HPCS 2015(ハイパフォーマンスコンピューティングと計算科学シンポジウム)最優秀論文賞

    2015  

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  • 第20回計算工学講演会・グラフィクスアワード優秀賞,ビジュアルコンピューティング賞

    2015  

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  • 日本計算工学会 第19回 計算工学講演会グラフィクスアワード最優秀賞

    2014  

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  • 第28回数値流体シンポジウム・ベストCFDグラフィクスアワード 動画部門 1位・2位,静止画部門 2位

    2014  

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  • 日本流体力学会フェロー会員称号付与

    2014  

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  • HPCS 2014(ハイパフォーマンスコンピューティングと計算科学シンポジウム)最優秀論文賞

    2014  

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  • HPCS 2013(ハイパフォーマンスコンピューティングと計算科学シンポジウム)最優秀論文賞

    2013  

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  • 平成24年度・日本計算工学会・論文賞

    2013  

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  • 第17回 計算工学講演会ベストペーパーアワード

    2012  

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  • 応用数理学会・業績賞

    2012  

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  • 文部科学大臣表彰科学技術賞(開発部門)

    2012  

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  • NVIDIA CUDA Fellow Award

    2012  

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  • Achievement Award for CUDA Centers of Excellence

    2012  

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  • 日本計算工学会・平成22年度論文賞

    2011  

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  • 日本計算力学連合・日本計算力学賞

    2011  

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  • ACM ゴードンベル賞・特別賞(本賞)「TSUBAME 2.0スパコンにおける樹枝状凝固成長のフェーズフィールド法を用いたペタスケール・シミュレーション」

    2011  

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  • 第24回数値流体シンポジウム・ベストCFDグラフィクスアワード 2位・3位

    2010  

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  • 可視化情報学会 2008年度「フラッシュ オブ ザ イヤー」

    2009  

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    Country:Japan

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  • 平成20年度 理研ベンチマークコンテスト優勝

    2009  

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    Country:Japan

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  • 日本機械学会フェロー

    2009  

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  • 平成19年度 理研ベンチマークコンテスト優勝

    2008  

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    Country:Japan

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  • 可視化情報学会 2008年度「フラッシュ オブ ザ イヤー」

    2008  

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  • JACM (Japan Association for Computational Mechanics) Fellow Award

    2007  

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    Country:Japan

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  • 第12回 計算工学講演会・ベストペーパーアワード

    2007  

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    Country:Japan

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  • 日本機械学会・第19回計算力学部門講演会ビジュアリゼーション・コンテスト優秀賞

    2006  

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    Country:Japan

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  • 第20回数値流体シンポジウム・ベストCFDグラフィクスアワード最優秀賞

    2006  

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    Country:Japan

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  • 日本機械学会・第18回計算力学部門講演会ビジュアリゼーション・コンテスト最優秀賞

    2005  

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    Country:Japan

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  • 第19回数値流体シンポジウム・ベストCFDグラフィクスアワード最優秀賞

    2005  

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    Country:Japan

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  • 第18回数値流体シンポジウム・ベストCFDグラフィックス・アワード最優秀賞

    2004  

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    Country:Japan

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  • 第18回数値流体シンポジウム・ベストCFDグラフィックス・アワード優秀賞

    2004  

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    Country:Japan

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  • 日本機械学会・計算力学部門・業績賞

    2004  

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  • ビジュアル・サイエンス・フェスタ2003 優秀賞

    2003  

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    Country:Japan

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  • ビジュアル・サイエンス・フェスタ2002(日経サイエンス)優秀賞

    2003  

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  • ビジュアル・サイエンス・フェスタ2003(日経サイエンス)優秀賞

    2003  

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  • 日本機械学会・計算力学部門・業績賞

    2003  

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  • 日本機械学会・第16回計算力学講演会ビジュアリゼーション優秀賞

    2003  

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    Country:Japan

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  • 第13回数値流体シンポジウム・ビデオコンテスト特別賞

    2002  

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  • ビジュアル・サイエンス・フェスタ2002 優秀賞

    2002  

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    Country:Japan

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  • 第13回数値流体シンポジウム・ビデオコンテスト特別賞

    1999  

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    Country:Japan

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  • 日経サイエンス コンピュータ・ビジュアリゼーション・コンテスト佳作

    1999  

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  • 日経サイエンス コンピュータ・ビジュアリゼーション・コンテスト佳作

    1997  

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▼display all

Research Projects

  • 羽ばたき遊泳動物の敏捷性と効率性を両立する運動制御メカニズムの解明

    Grant number:24K00845  2024.4 - 2027.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    田中 博人, 加古川 篤, 菊地 デイル万次郎, 青木 尊之, 中島 求

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    Grant amount:\18590000 ( Direct Cost: \14300000 、 Indirect Cost:\4290000 )

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  • Elucidation of semi-solid dynamics by innovative computational method and challenge to material microstructure refinement

    Grant number:23H00160  2023.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\47320000 ( Direct Cost: \36400000 、 Indirect Cost:\10920000 )

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  • Development of AI for autonomous ship handling to accelerate ocean-bottom exploration, and its demonstration at actual sea

    Grant number:20H00284  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\44590000 ( Direct Cost: \34300000 、 Indirect Cost:\10290000 )

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  • Development of advanced simulator for solidification microstructure prediction and its application to integration technology of simulation and experiment

    Grant number:20H00217  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\45760000 ( Direct Cost: \35200000 、 Indirect Cost:\10560000 )

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  • Innovative CFD simulation for multiphase flows including free surfaces

    Grant number:19H05613  2019.6 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

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    Grant amount:\194610000 ( Direct Cost: \149700000 、 Indirect Cost:\44910000 )

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  • Study on Liquid Film Dynamics and Forming and Breaking-up of Foam by using Large-scale Numerical Simulation

    Grant number:19H00746  2019.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\45370000 ( Direct Cost: \34900000 、 Indirect Cost:\10470000 )

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  • Development of innovative prediction method of material microstructure by quantitative coupling of large-scale simulation and in situ observation

    Grant number:17H01237  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Takaki Tomohiro

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    Grant amount:\43940000 ( Direct Cost: \33800000 、 Indirect Cost:\10140000 )

    In material development, accurate prediction and control of material microstructures are extremely important. In this study, we tried to construct an innovative mesoscale material structure prediction approach by combining three cutting-edge researches of phase-field (PF) simulation, in-situ observation by SPring-8, and molecular dynamics (MD) simulation through data science. We successfully developed the data assimilation to calculate the interfacial physical properties by PF and EnKF using the MD results as observation data. Moreover, to obtain the material physical properties and field information, we constructed a frame of data assimilation by PF and EnKF using the results of SPring-8 in-situ observation as observation data. In addition, we constructed the high-performance PF simulation schemes and performed large-scale PF simulations for solidification and grain growth to predict the material microstructures and clarify important mechanisms in microstructure formation process.

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  • ものづくりHPCアプリケーションのエクサスケールへの進化

    2014.6 - 2019.3

    日本学術振興会  科学研究費補助金・基盤研究(S) 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • ものづくり流体アプリケーションのエクサスケールへの進化

    Grant number:26240018  2014.4 - 2015.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    青木 尊之, 高木 知弘, 滝沢 研二, 森口 周二, 下川辺 隆史

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    Grant amount:\10920000 ( Direct Cost: \8400000 、 Indirect Cost:\2520000 )

    エクサスケールのスパコンにおいて、ものづくりを革新的に発展させるアプリケーションを開発するためには、既存のアプリケーションから根底から作り直す必要がある。所望する計算結果を得るまでの時間「Time to Solution」を最重要視した新しい陽的時間積分に基づいた数値計算手法と計算アルゴリズムを導入する研究を進めた。
    数値計算手法(離散化)に関して陰解法から陽解法、低次精度から高次精度空間離散化、非構造格子から局所的に均一な構造格子等への転換を行い、一方で計算アルゴリズムに対して、① データ移動の最小化、② 演算密度の向上、③ ノード間通信を隣接通信に限定等を行う。さらに詳細なパフォーマンス・モデルを構築し、エクサスケールの問題規模において高い実行性能を確実に達成する。手本となる流体アプリケーションの成功例を示し、ものづくり分野への大きな貢献を目的として研究に着手した。
    計算アルゴリズムの検討において、完全陽解法にすることで、ペタスケールの格子系アプリケーションで導入してきた演算と通信のオーバーラップによる通信時間の隠ぺいが計算の殆どの部分で可能になることを確認した。さらに、方向分離を双曲型方程式にTemporal Blockingによる時間積分方向のデータ再利用にキャッシュの利用を促進する計算アルゴリズムを導入を検討した。
    この段階で本基盤研究(A)を包含する基盤研究(S)の採択が決定し、以降の研究遂行を基盤研究(S)で行うこととした。

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  • ものづくりCFDアプリケーションのエクサスケールへの進化

    2014.4

    日本学術振興会  科学研究費補助金・基盤研究(A) 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • Elucidation of mechanisms of dendrite competitive growth by very-large-scale GPU phase-field simulations

    Grant number:25289006  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Takaki Tomohiro, AOKI Takayuki, YAMANAKA Akinori

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    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

    We have enabled the very-large-scale phase-field simulation using the GPU supercomputer TSUBAME2.5 at Tokyo Institute of Technology. By performing the simulations during directional solidification for single-, bi-, and poly-crystals of a binary alloy, the mechanism of competitive growth between dendrites has been made clear. In addition, we have developed a simulation tool which can simulate the dendrite growth with melt flow by coupling phase-field method and lattice Boltzmann method.

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  • GPUスパコンにおける新しい界面捕獲を導入した大規模気液二相流シミュレーション

    Grant number:13F03780  2013.4 - 2016.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    青木 尊之, HYSING JOHAN, HYSING Johan

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    複雑形状の物体に対してセルを適合させるためのコードを開発し、大幅に精度が向上することを示した。大部分の領域を高速なステンシル計算で行い、局所的に境界に適合するセルを配置することにより、ポアソン方程式の数値実験、円柱周りの流れのベンチマーク問題、上昇気泡問題で非常に良い結果を得た。
    既存のh/r/p-adaptionの技術に対して相補的に使用することができる新しいアプローチを開発した。完全に均一なテンソル積対応の格子から出発し、セルの縁を幾何学的に境界と揃える。ステンシルに基づいた手法を念頭において設計された方法論で、今回の場合は、格子の大部分では非常に高速なステンシル計算を実行し、ごく局所的にコストの高いFEM生成と解法を実行する高性能なステンシルに基づいたFEMソルバーとなっている。新しい格子整列法は、自動的に非構造の四角形格子の生成、格子の移動、流体力学における衝撃波や構造力学における破砕などの不連続現象を含む計算などの幅広い用途へ応用できる可能性がある。また、複雑な形状を表現できるようにするために、新しい空間領域構成法(constructive solid geometry; CSG))のライブラリを開発した。
    規則的な四角形格子を幾何学的な境界や浸漬界面へ揃える簡便な手法も開発した。この手法の応用は多く、提案したステンシルFEM法の精度向上に貢献したことに加え自動的な四角形格子の生成や不連続現象へ格子を揃えることが可能である。生成された整列格子は、ポアソン方程式のための標準的なテンソル積格子による計算や、円柱周りの定常状態や時間変動する非圧縮性流れや静的および上昇気泡を伴う混相流などの複雑シミュレーションと比較した。これらの比較によって、整列格子は、非整列格子を用いた計算と比較して精度が非常に向上することができた。本手法を一般的な気液二相流計算へ適用し、高精度な計算を行うことへの見通しが得られた。

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  • GPUスパコンによる気液二相流と物体の相互作用の超大規模シミュレーション

    2011.4 - 2013.3

    日本学術振興会  科学研究費補助金・基盤研究(B) 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • 高性能・高生産性アプリケーションフレームワークによるポストペタスケール高性能計算の実現

    2010.10 - 2017.3

    科学技術振興機構  戦略的創造研究推進事業CREST 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • Applicability limit of high accuracy simulation for rock-fall and debris-flow using several numerical methods.

    Grant number:21360222  2010 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    SAWADA Kazuhide, MAEDA Kenichi, KOBAYASHI Yoshikazu, MORIGUCHI Syuji, AOKI Takayuki

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

    Applicable problems and applicable scopes of numerical methods(DEM, CFD, MPS and SPH) that are used in the field of geo-mechanics are summarized. First, allocable scopes of numerical methods are figured out based on deformation levels and types. Then, suitable numerical methods for each geotechnical problems, mainly focused on rockfalls and soil failures, were figured out. In addition, the numerical methods were applied to some engineering problems and important points were summarized from the point of view of engineering utilization.

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  • ULP-HPC:次世代テクノロジのモデル化・最適化による超低消費電力ハイパフォーマンスコンピューティング

    2007.10 - 2011.3

    科学技術振興機構  戦略的創造研究推進事業CREST 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • 多モーメント手法による多目的CFDコアの開発

    2007.4 - 2009.3

    日本学術振興会  科学研究費補助金・基盤研究(B) 

    青木 尊之

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    Authorship:Principal investigator  Grant type:Competitive

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  • 衝撃波・岩石破砕を含む噴火シミュレータのための高精度数値計算スキームの開発

    Grant number:17031008  2005 - 2006

    日本学術振興会  科学研究費助成事業  特定領域研究

    青木 尊之

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    Grant amount:\4100000 ( Direct Cost: \4100000 )

    「噴火シミュレータ」をさらに高精度化するための以下の数値計算法の開発を行った。火山噴火は爆風の衝撃波伝播とかなり類似した部分があり圧縮性流体計算を必要とする。非常に狭い領域で大きなエネルギーを短時間に放出し、その影響が広範囲に及ぶ。数値計算手法に求められることとして、噴火口付近の領域に十分細かい計算格子を配置する、密度・圧力の急激な変化に対して安定に計算できるスキームである、長時間積分が可能である、ことが必要である。これらの全てを満足する数値計算手法として、保存形の局所補間微分オペレータ(IDO)法をさらに発展させた。
    (1)従来の物理量の値と微係数を従属変数として補間関数を構築するIDO法を値と区間積分値を従属変数として補間関数を構築する方式に変更し、区間積分値に対しては偏微分方程式を区間積分して得られる方程式で時間積分を行い、flux formの保存形IDO法を構築した。
    (2)保存形IDO法の精度検証を行い、風上補間の場合には補間関数は2次多項式になるにも関わらず、移流計算の精度は3次精度であることが明らかになった。また、中心補間に対しては4次多項式になり4次精度がでることが分かった。非保存形IDO法と比較して補間関数の多項式の次数は下がるが、フーリエ解析の結果はgainおよびphaseとも非保存形と区別できないほど一致した結果が得られた。
    (3)噴火の最中は火口付近の空間解像度を十分高くし、噴火終了後は噴煙を精度よく捕らえるために上空の空間解像度をAdaptiveに高くするAMR (Adaptive Mesh Refinement)法にIDO法を検討した。非保存形IDO法の場合と異なり、Cellのマージ過程に補間操作が無くなり、積分値は単純な足し算となるためこの部分の誤差がゼロであることが分かった。
    (4)岩石のモデル化として、複雑な形状を反映するために非球形モデルの個別要素法をさらに発展させ、球形粒子を複雑形状の岩石を多数(1000個)配置し、斜面を転がり落ちる落石過程をより高精度化した。また、岩石の慣性モーメントもより忠実に計算する方法に改善した。また、岩石破壊過程のモデルを検討し、計算量の問題から岩石全体の構成粒子を要素バネで連結することは困難であることが判明し、剛体連結したクラスター粒子の間を断裂するバネで連結し落石計算を行った。

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  • Development of Class Library for Fluid-Structure Interaction

    Grant number:16360045  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    AOKI Takayuki, XIAO Feng, OGAWA Takanobu, AKIBA Hiroshi

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    Grant amount:\13600000 ( Direct Cost: \13600000 )

    Fluid-structure interaction problems are still unknown phenomena and it is highly expected to study them by numerical simulations. In this study, the class library of C++ programming language was developed to analyze fluid-structure interaction problems. The library consists of fluid-simulation class with sophisticated numerical method, structure-analysis class, fluid-structure coupling class, grid generation class, parallel computing class, and visualization class. By combining these classes depending on the problems, numerical simulation codes are easily constructed.
    In the fluid-simulation class, high-accurate numerical method was developed and the stable coupling method on the collocated grid was proposed in which easily introduces fluid-structure interaction. This method is also easily applicable to parallel computing and the explosion simulation was executed by 2000 CPU of a PC-Cluster system. In the AMR sub-class, it is possible to refine the mesh of the tree-data structure with third-order spatial accuracy. It is found that the overset grid sub-class is quit effective for rigid body of transform and rotational motion in fluid. The torque of the wind turbine was studied with using this sub-class. We developed the sub-class of Immersed boundary method which makes it possible to treat complex shapes on Cartesian grid. The sub-class of Distinct Element Method was used to study destruction of the structure with mass-spring model. The sub-class of photo-realistic rendering could visualize the bubbly flow and meso-scale typhoon simulation and made high-quality animations by using POV-Ray software. These ware highly evaluated.

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  • 新型高性能軟X線レーザーの物理と開発実用化の研究

    Grant number:14GS0206  2002 - 2007

    日本学術振興会  科学研究費助成事業  学術創成研究費

    黒田 寛人, 馬場 基芳, 青木 尊之, 尾崎 恒之

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    Grant amount:\482170000 ( Direct Cost: \398230000 、 Indirect Cost:\83940000 )

    縦型過渡励起軟X線レーザー生成のための固体ターゲットからの高密度レーザープラズマを非線形媒質に用いる制御高次高調波軟X線レーザーを初めて提案、実証した。イオン化エネルギーの高いマンガンを用いて7.9nm(101次)の制御高調波軟X線を得たが、レーザープラズマからのイオンを用いた高次高調波では世界最高次の最短波長である。レーザー誘起共鳴増幅による特定次数のコヒーレント単一制御高調波軟X線が得られることを世界に先駆けて実証し高出力・高効率化を達成し、その機構を解明した。Inを初め、次々と異常強力単一周波数共鳴増幅を観測した。変換効率は〜10^<-4>と桁違いの大きさであり、1パルス当たり1μJ以上という高エネルギーを得た。全く新しい新スキーム光源であり、励起レーザー波長やチャープ量、強度を精密にコントロールすることによって波長制御や変換効率をさらに上げられることがわかり今後の大きな期待が持てる。金属ナノ粒子クラスターを固体ターゲットに用いると高次での高調波強度がバルクターゲットに較べて6倍もの増強になることも確認した。ダブルターゲット方式による2波長高次高調波同時発生のスキームも確立し、2つのターゲットを並べてプリアイオナイズしておきメインレーザーを打ち込むとそれぞれのターゲットに特性的なスペクトルが加算され特性的な2波長で同時に高調波の発生が実証され分光用光源として大いに期待が高まった。
    さらに半導体を含む種々の試料上に生成されるナノ構造が波長の数分の一以下になりうることや励起波長によってもナノ構造が劇的に変わることを発見するなど軟X線の応用の知見を得た。医学グループと連携してシグナル伝達の極微量計測システムにより蛍光共鳴エネルギー転移現象によるタンパク間のリガンド活性による構造変化をピコ秒スケールで時間発展観測をおこなった。
    このようにコヒーレント軟X線光源を有効利用・測定する手法等を開発し新展開を目指し水の窓領域への挑戦を続けている。

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  • 複数の単色X線を用いたカラーX線診断の基礎研究

    Grant number:14658285  2002 - 2003

    日本学術振興会  科学研究費助成事業  萌芽研究

    小川 雅生, 長谷川 純, 青木 尊之, 小栗 慶之, 堀岡 一彦, 米山 隆一

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    Grant amount:\3500000 ( Direct Cost: \3500000 )

    単色X線を用いてカラーX線画像を得るための予備実験を行った。東京工業大学のタンデム加速器から得られる、エネルギーが3MeVの陽子ビームをPd, Ag, Cd, Inの標的に照射し、エネルギーが21.17〜24.21keVのK_αX線およびそれに付随する相対強度が約18%のK_βX線、すなわち擬似単色X線を発生させ、これらのX線を、マイラ幕を通して大気中に取り出した。X線の発生量およびエネルギーのモニターにはCdTe半導体検出器を用いた。上記のK_αX線のエネルギーが1keV間隔で離れていることに注目し、Ruの造影撮影を試みた。RuのKX線の吸収端が22.1keVにあるので、X線発生標的としてPd(K_αが21.17keV)とCd(K_αが23.17keV)を選んだ。アクリル製のブロックに孔をあけ、そこにRuを含む水を詰め、血管を模擬するファントムとした。比較用に水だけの孔、空気の孔もあけてある。X線画像の取得には歯科用のイメージングプレートを使用した。画素の読み取り分解能は50μm×50μmである。2種類のX線照射により得られた画像を水だけの部分が消えるように演算処理することにより、Ru水溶液と空気の部分を強調することに成功した。
    15年11月には原子力研究所高崎研究所のバンデグラフ加速器施設のマシンタイムを得て、同様な実験を行った。2.6MeVの陽子ビームを用いてRu造影のファントム測定を行い、東京工業大学における実験よりもきれいな画像を得ることができた。更に、ビームスポットが10μm×10μmと非常に小さい陽子マイクロビームを用いて、X線画像の拡大撮影を試みた。資料は小魚(シラス)であり、厚さは約1mm、長さは約20mmである。シラスにはCa(K吸収端が4.04keV)が含まれることから、X線発生標的としてTi(K_αが4.05keV)とCu(K_αが8.04keV)を用意した。いずれのX線の場合にも位置分解能が約20mmのきれいな画像を得た。Ti-K_αの方が若干であるが、良いコントラストの画像であった。

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  • Construction of Diagnosis System of Blood Flow by CFD Based on Clinical MRI Data

    Grant number:13680928  2001 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    AOKI Takayuki, IKEHIRA Hiroo, HASEGAWA Jun

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    Grant amount:\4100000 ( Direct Cost: \4100000 )

    Recently, clinical image diagnosis instruments such as MRI (Magnetic Resonance Imaging, X-ray CT, Ultrasonic Doppler imaging etc. have developed and give us a large amount of high resolution image data. Especially, MRI data are obtained with negligible damage for human body and spread over many hospitals.
    The research results are categorized into the method for extracting blood structure from the MRI data, development of high accurate numerical scheme for blood flow simulation, and numerical results of blood flow simulation. By using B-spline interpolation, the blood structure of the brain for the blood flow CFD can be extracted with smooth curvatures from the MRA (magnetic resonance angiography). We have developed high accurate numerical scheme with local Hermite interpolation and the Cut-Cell method to describe blood vessel with complex geometry and AMR (Adaptive Mesh Refinement) method for adapting fine resolution around blood vessels on Cartesian grid. We carried out the numerical simulation for the interaction of the blood flow injected pulsatively with the elastic vessel. It is found that the pressure at the inner wall has lower peak than that of the rigid vessel case, and the velocity response of the outflow is delayed. We also studied micro-scale blood flow simulation with a particle model where non-Newtonian behaviors become important.
    We have obtained a lot of results for construction of the flood flow CFD analysis system for the individual clinical MRI data.

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  • GPU Computing

    2001

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    Grant type:Competitive

    GPUs have been used for graphics processing, but they are SIMD-type accelerators and some HPC applications are suitable for them. The numerical scheme and algorithm are developed.

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  • 家庭用ゲーム機プレイステーション2による大規模並列流体解析システムの構築

    Grant number:12555021  2000 - 2002

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    青木 尊之, 吉田 正典, 奥村 晴彦, 矢部 孝, 塙 雅典, 野澤 恵

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    Grant amount:\12200000 ( Direct Cost: \12200000 )

    昨年度導入した20台のプレイステーション2 Linux kitで、並列の数値流体シミュレーションを行った。非圧縮性流体の場合、大量のネットワーク通信を伴うポアソン方程式の解法が最も大きな課題となる。並列化が容易なSOR法で2次中心差分法による離散化式と、局所補間微分オペレータ法による4次精度の離散化式を解いた。Linux kitに付属するGNUのコンパイラは、プレイステーション2のCPUであるEmotion Engine(EE)の高速化アーキテクチャを利用する最適化が行えず、インライン・アセンブラにより直接EEのベクトル・レジスタVU0を利用することにした。ベクトル・レジスタVU0を4並列で効率よく実行する必要があるが、メモリーからデータをロードするのに時間がかかり、その間はVU0が休んでしまう結果となった。これを回避するために、VU0の演算スケジュールを工夫し、データのロード・ストアを含めて450MFlopsの計算速度を達成した。プレイステーション2が高速のRAMBUSメモリーを用いているために、CPUキャッシュに入りきらないデータに対するアクセスに対しても余り速度が低下しないことが明らかになった。
    EEのもう一つの問題点として指摘されている「VU0が単精度演算しか行えないこと」を解決する必要がある。倍精度計算に対しては浮動小数点演算プロセッサが働かなくなり、計算速度は100分の一以下に低下してしまう。単精度計算で直接従属変数からポアソン方程式を計算すると桁落ちが生じてしまうので、残差から修正方程式を導出し修正量を求めて従属変数に加算・減算して修正する方法を開発した。修正方程式を解く際に桁落ちなどの誤差が入るが、反復ごとに修正値が小さな値に移行し、従属変数の精度範囲をまかなえることが明らかになった。
    非圧縮性流体の移流部分や圧縮性流体に対しては局所補間微分オペレータ法が少ないメモリーに対して高精度な計算を行うことができ、プレイステーション2に適していることが分かった。また、ルンゲクッタ時間積分を行うことにより安定な計算ができることが明らかになった。

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  • Large-scale parallel computing

    2000

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    Grant type:Competitive

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  • Numerical Simulation for generation of Carbon Simple Cubic by Dynamic Compression of flyer impact

    Grant number:11680478  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    AOKI Takayuki, HORIOKA Kazuhiko, SEKINE Toshimori

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    Grant amount:\3600000 ( Direct Cost: \3600000 )

    This research numerically makes it clear that Carbon Simple Cubic is able to be generated thermodynamically by the dynamic compression of the impact at the collision between the target and flyer which is accelerated by the laser ablation pressure. The Carbon Simple Cubic is expected to appear at the pressure more than 2 Tpa, however it may melt with the temperature of more than several 1000 K. An impact scheme of a slab target and flyer with a layered structure is proposed to achieve low-entropy dynamic compression starting from diamond. The thermodynamic state of diamond during compression is examined using one-dimensional Lagrangian hydrodynamic code and the tabulated equation of state library SESAME. The use of a material with a small shock impedance for the impact interfaces markedly decreases the strength of the primary shock wave. It is found that a gradient of shock impedance across the thickness of the flyer generates small multiple shock waves into the diamond and effective for low-entropy compression. The thermodynamic conditions required for Carbon Simple Cubic and low-entropy dynamic compression is achived.

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  • プラズマレンズによる大強度シングルバンチ・重イオンビームの集束に関する研究

    Grant number:11874039  1999 - 2000

    日本学術振興会  科学研究費助成事業  萌芽的研究

    小川 雅生, 長谷川 純, 青木 尊之

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    Grant amount:\900000 ( Direct Cost: \900000 )

    本年度は、前年度に引き続きプラズマレンズの数値解析を行った。数値解析には輻射輸送を考慮した1次元電磁流体コードMULTI-Zを用いた。計算コードの検証を行うためにまず、実験との比較を行った。Zピンチ放電装置により発生する高密度Heプラズマの分光診断を行い、得られた電子密度、電子温度をMULTI-Zの計算結果と比較した。その結果、実験値と計算値の違いは10%以内に収まっており、計算コードはプラズマレンズの設計に用いるのに十分な信頼性を有することが分かった。計算から求めた最大ピンチ時の方位角方向の磁束密度分布は、中心軸(Z軸)からやや離れたところでは比較的なだらかで線形な半径方向分布を持っており、理想的なレンズの条件を満たしていることが分かった。しかし、中心軸近傍では電子密度、電子温度の勾配が非常に大きく、またその変動も急激に起こるため、複雑な電流分布となり、磁束密度分布も乱れていることが分かった。従って、中心軸近傍を通過するイオンビームは急激な偏向を受け、うまく収束できない可能性がある。実際にプラズマレンズを用いたビーム収束実験では、ドーナツ状のビーム収束パターンが観測されており、これは上記の結果を裏付けている。ピンチ時の磁束密度分布(電流分布)は、放電管半径、放電電流波形、ガス充填圧力に強く依存しており、これらを最適化することにより、個々のケースに合わせたプラズマレンズの適切な設計が可能であることが本研究の解析から明らかになった。

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  • Wavelength Scaling of Soft X-ray Lasers Pumped by Fast Capillary Discharges

    Grant number:09450036  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HORIOKA Kazuhiko, AOKI Takayuki, NAKAJIMA Mitsuo

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    Grant amount:\8800000 ( Direct Cost: \8800000 )

    Based on experimental results, numerical simulations, and an analytical model for amplification process of stimulated radiation in inhomogeneous laser mediums, the potentiality of fast capillary discharge plasma as a pumping source of soft X-ray laser is discussed. Z-discharges driven by fast pulse power generator can make axi-symmetric and high energy density plasmas with large aspect ratio. With well controlled pre-ionization, it makes the rapidly imploding z-pinch plasma with good reproducibility. In contrast to laser excited scheme, the discharge pumping uses compression process for making the high energy density plasma. Thus the plasma at final compression phase can be controlled so as to make optimum parameter and structure of plasma for pumping the laser line. In this scheme, there are a lot of control parameters such as the initial gas pressure, the diameter, the peak current and the rise time of drive current. A prospect for the operation at shorter wavelength region was discussed and we could conclude that with optimization of those discharge parameters, we can expect large energy output at soft X-ray region.

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  • Development of Numerical Method for Mesoscopic Flow

    Grant number:09680474  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YABE Takashi, AOKI Takayuki

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    Grant amount:\3100000 ( Direct Cost: \3100000 )

    For the research of microscopic phenomena, molecular dynamics model has been proposed and for macroscopic level various kinds of hydrodynamic solvers have been investigated for a long time. In this research, we search for a numerical method to treat mesoscopic level that means the intermediate scale between and microscopic and macroscopic levels . For this purpose, we have used the CIP method which has been proposed by the author and has been proved to be accurate even with coarse grid system. In this research, we have used the Boltzmann equation which is six dimensions in phase space. Thus time evolution is merely an advection through six dimensions. Since the CIP method has been proved to be quite effective in solving advection equation, we applied this method and for simplicity we repeated one-dimensional CIP method to extend it to hyper-dimensional space.
    In order to test the algorithm, we solved two and four dimensional Vlasov equation which is collisionless Boltzmann equation, and applied it to linear Landau damping and nonlinear two-stream instability coupled with electric fields.
    Comparison with conventional particle codes and spline method has been done and it has been proven that particle codes need 10-100 times more memory than the CIP method for obtaining the same results. For a sufficiently accurate form of velocity distribution function required by mesoscopic calculations, particle codes needed 100 times more memory than the CIP method. Distribution functions given by spline methods become negative and have large spikes. These comparisons show the effectiveness of the CIP method in this research.
    We have varied the velocity grids and found that even with velocity grids less than 10 the CIP can give quite an accurate result. Finally, six dimensional code has been constructed and run on personal computer. One Alpha-chip-based personal computer needed only 6.7 hours for the calculation of Landau damping with 16 X 16 X 16 X 8 X 8 X 8 grids.

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  • 超新星爆発における超高速エジェクタの解明

    Grant number:08212203  1996

    日本学術振興会  科学研究費助成事業  重点領域研究

    矢部 孝, 青木 尊之

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    Grant amount:\800000 ( Direct Cost: \800000 )

    最近、X線衛星ROSATによる観測で、Velaの超新星残骸の中に、複数の衝撃波に先行するエジェクタと思われる像が得られた。現在の所この現象を説明する理論はない。我々は、この現象を解明するために、独自に開発した気体から液体、固体へと相転移してゆく過程を一つのスキームで統一して解くことができる計算手法CIP法による三次元流体シミュレーションコードを適用した。我々は、この原因を爆発時に誘起されたレーリーテーラー不安定性と衝撃波との相互作用にあると推定して、レーリーテーラー不安定性によって形成されたバブルに衝撃波が入射する過程を計算した。この過程は、腎臓結石を破砕するために結石に気泡を付着させ、これに衝撃波を印可すると液体マイクロジェットが生成され衝撃波の圧力の100倍にも相当する高圧が発生する事実からの類推である。もし、このようなバブル(気泡)と衝撃波の相互作用が超新星爆発にも適用できれば、超高速エジェクタは丁度液体マイクロジェットのメカニズムと一致する。我々は、腎臓結石の破砕のシミュレーションを行い、実験結果との良い一致を見た。さらにこのパラメータを超新星爆発に適用した結果、衝撃波背後の密度の2倍から3倍の高密度でかつ集中した固まりが形成され高速で加速されることを見いだした。気泡の形、サイズを変えながらシミュレーションを繰り返したところ、衝撃波のマッハ数や気泡のスペクトル比に大きく依存する結果を得た。このエジェクタがVela超新星で観測されたものと一致するかどうかは今後の課題であるが、その有力な候補であることは間違いないであろう。

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  • キャピラリー放電X線レーザーの安定性と短波長化スケーリングの解明

    Grant number:08780447  1996

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    青木 尊之

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    Grant amount:\800000 ( Direct Cost: \800000 )

    キャピラリー放電ピンチのダイナミクスを調べるために、1次元円筒座標系の電磁流体コードを作成した。アルゴンを使ったコロラド大学の実験や東京工業大学の放電ピンチの実験に合わせた駆動電流波形をインプットすると、最大ピンチ時間やX線レーザー利得の持続時間などの実験結果を非常に良く再現することができた。また、最初に衝撃波が中心に到達し、その後に電流層がローレンツ力でピンチして行くという詳細も明らかになった。
    X線レーザーを短波長化するためには、アルゴンより重い元素のプラズマを使う必要があり、クリプトンまでの元素に対するシミュレーションを実行した。元素が重くなるに従いネオン様イオンを生成するための電子温度・電子密度が高くなり、要求される駆動電流も飛躍的に増大した。初期プラズマ半径を小さくすれば必要とされる電流は少なくて済むが、X線レーザーの利得が得られる領域が狭くなり、さらにプラズマの密度勾配が大きくなることから軸方向に伝播するX線レーザーのパスが利得領域から逸れてしまうことが分かった。
    2次元の電磁流体コードは、新しい数値計算手法(CIP法)を取り入れ、ピンチ・ダイナミクスの不安定性を精度良く解析できるように開発した。2次元コードによる解析では、今まで予想されている電磁流体不安定性(ソ-セージおよびキンク不安定性など)よりも、密度の低い電流層が中心の高密度プラズマを圧縮する際のレーリー・テーラー不安定性の方が成長率が大きく、初期半径を小さくすればする程成長率が大きくなることが明らかになった。レーリー・テーラー不安定性を押さえるには初期プラズマの一様性が重要であり、放電励起X線レーザーにとって予備放電が非常に重要である理由も明らかになった。

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  • Interaction of Heavy Ions with High Density Laser Plasma for Inertial Confinement Fusion

    Grant number:07458112  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OGAWA Masao, NAKAJIMA Mitsuo, AOKI Takayuki, HORIOKA Kazuhiko

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    Grant amount:\5700000 ( Direct Cost: \5700000 )

    A high density plasma was formed by irradiation of CO2 laser. The laser had an output energy of 3J with a time duration of 1mus. Polyethylene was adopted as a target material. Ablating plasma of hydrogen was observed up to more than 10 mm from target surface. The Stark broadening of Halpha and Hbeta lines was measured as a function of time and space to obtain electron density of the plasma. The electron density of the expanding plasma decreased as a power function of distance from 10^<19>cm^<-3> to 10^16cm^<-3>. The optical analysis revealed that the plasma was feasible as an in-beam target from the view point of size and density.
    A Li^+ beam of 0.9 MeV was injected to the polyethylene plasma. The Li ions stripped to the charge state of 3^+ were analyzed with a magnet and then detected with a scintillator. A carbon foil was used as a cold matter for comparison. Although the plasma enhancement was not yet fully observed, the ablating matter revealed the same effect as a charge stripper with the carbon foil. A new vacuum chamber was fabricated to observe simultaneously the ions of 1^+,2^+,3^+ states. The measurement of interaction of heavy ions with the high-density plasma is to be initiated in one month.
    In addition to the in-beam experiment, a Mach-Zehnder interferometer of two waves was assembled by combining He-Ne and Ar lasers. The interferometer was first tested with a z-pinch helium plasma. It was hard to observe the interferometry at the time when the high density was formed because of the non-uniformity of the plasma medium.

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  • 21世紀の先進工業国における技術のあり方

    Grant number:04210105  1994

    日本学術振興会  科学研究費助成事業  重点領域研究

    阿部 寛治, 趙 孟佑, 蔡 東生, 伊藤 利明, 青柳 晃, 丹生 慶四郎, 坂口 尭, 青木 尊之, 矢部 孝

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    Grant amount:\12000000 ( Direct Cost: \12000000 )

    地球環境問題とその裏表の関係にある資源エネルギー問題の解決方法にを明示した。その方法を分類すると、ハードパスとソフトパスの2つになる。まずハードパスでもっとも推進すべきは熱核融合の達成である。熱核融合による商業発電に成功すると、人類は新しい地平に出る。エネルギー問題はもちろんのこと資源問題、地球環境問題、さらに食料問題のかなりの部分も解決できる、熱核融合で得られる電気エネルギーはもっとも良質のエネルギーで、地球大気の化学成分変化を引き起こさないので、地球大気の温暖化とは無関係である。ソフトパスのうちもっとも現実的なものは、CC(Computer & Comunication)システム導入による技術革新である。CCシステム導入により郵便システム等が不必要になり、情報の自由な移動により人間の移動の必要性が大幅に減少する。これは交通システムと住宅事情への負荷の軽減をもたらす。ただしCCシステムによる地球環境問題への負荷の軽減は熱核融合達成によるものに比べるとドラマチックではない。CCシステム化した社会の変化は現在でも想像できる。これに対して熱核融合達成は現時点では想像不可能なほどの革命的な社会変化をもたらす。
    もし人類が熱核融合達成に失敗したときは、痛みを伴うソフトパスを導入する必要がある。すなわち大量生産と大量消費を引き起こしている市場原理の廃止と、私有財産生の克服である。具体的に述べると、自動車など機器の使用年数の延長のために設計思想を変えて、修理しやすい機器の製造、機器の共有による生産量の減少を計る必要がある。これらを補完するもとして、中等技術教育(特に女子教育)を強化しなければならない。

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  • 省資源・省エネルギ-型高度技術社会の形態

    Grant number:03228105  1991

    日本学術振興会  科学研究費助成事業  重点領域研究

    阿部 寛治, 青木 尊之, 坂口 尭, 青柳 晃, 矢部 孝, 丹生 慶四郎

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    Grant amount:\4500000 ( Direct Cost: \4500000 )

    当研究は省資源・省エネルギ-の本来の意味に立ち帰り、消費資源量を現在の1/5に抑え、かつ現在の生活水準を落さない高度技術社会の可能性を探るものである。種々の分野の技術的イノベ-ションの限界が見えつつある現在では、通常のハ-ド面での効率向上では1/5の省資源は達成できない。当研究では省資源のひとつの方策として機器の社会的共有を重視する。たとえば1台のマイカ-を5軒で共有すると、社会が必要とする車輌は1/5になる。この場合現在の私有財産制のもとでは「マイカ-の利便性がそこなわれる」という反論がたちまち発生するわけだが、当研究では現在の環境問題の克服は社会システムの変改なしにはできないと考えている。しかしもしマイカ-が1軒当り1日に5時間使われているとすると5軒によるアワカ-システムは時間的に成立しない。当年度はマイカ-の使用実態とマイカ-に対する意識調査をアンケ-トにより行なった。
    (1)アンケ-ト発送先:千葉県内一戸建家屋居住者2830名。埼玉県内集合住宅居住者500名。群馬大学教職員1500名。東京工業大学卒業者5500名
    (2)マイカ-の平均所有台数1軒と平均使用時間1/(台・日):前者は1.1台/軒、後者は1.1時間/(台・日)である。
    (3)マイカ-使用自粛キャンペ-ンについて:東京都などが行なっている「水曜日は交通量を減そうキャンペ-ン」を知っている人が49%、知らない人が51%である。
    (4)塔乗者1人の乗用車からの通行料徴収について:設問は「1人しか乗っていない車から通行料金徴収を行うことをどう思いますか?」である。「やめてほしい」が61%、「実施してほしい」が34%である。

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  • 省資源・省エネルギ-型高度技術社会の形態

    Grant number:02244105  1990

    日本学術振興会  科学研究費助成事業  重点領域研究

    阿部 寛治, 青木 尊之, 坂口 尭, 青柳 晃, 矢部 孝, 丹生 慶四郎

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    Grant amount:\6000000 ( Direct Cost: \6000000 )

    当研究は省資源・省エネルギ-の本来の意味に立ち帰り,消費資源(エネルギ-もふくむ)量を現在の1/5に抑え,かつ現在の生活水準を落とさない高度技術社会の形態の可能性を探るものである.そのために重視することのひとつは「機器の修理・保全」である.ちなみに機器の使用年数を5倍にすれば必要生産量を1/5でよい.発生する廃棄物も1/5になるので廃棄物処理に要するエネルギ-量も大幅に減少するであろう.重視するもうひとつは自家用乗用車の平均搭乗者数である.平均搭乗者数が3倍になれば必要走行車車両数は1/3になる.このような観点から当研究では自家用乗用車の平均搭乗車数の調査と家庭用電化製品の平均使用年数の調査を行なった.
    (1)電化製品の平均使用年数.若年層の消費動向を調査するために群馬大学など4大学の計542名の学生を対象にアンケ-ト調査を行なった.対象品目は腕時計,ウォ-クマンなど学生が所持している計12品目である.平均すると学生は約4年で捨てていることが判明した.また家庭用ク-ラ-などの平均使用年数についても既存のデ-タを収集したところ,家庭用電化製品の平均使用年数は7〜11年であることが判明した.
    (2)自家用車の平均搭乗車数.東京都,福岡市など全国の計12ヶ所で調べた.道路脇で走行自動車の搭乗車数をカウンタ-で積算した.通過乗用車の総台数は144,159台である.ウィ-クデ-と日曜日の計3日調査した.ウィ-クデ-の比率を2,日曜日のの比率を1として平均すると平均搭乗車数は1.53名である.

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  • Development of Adaptive Mesh Refinement Method for Interpolated Differential Operator Scheme

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    Grant type:Competitive

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