Watanabe, Hiroshi

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics （Yagami）

Position

Professor

Related Websites

External Links
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Career 【 Display / hide 】

  • 2004.04
    -
    2007.03

    名古屋大学大学院, 情報科学研究科複雑系科学専攻, 助手

  • 2007.04
    -
    2008.07

    名古屋大学大学, 院情報科学研究科複雑系科学専攻, 助教

  • 2008.08
    -
    2010.07

    東京大学情報センター, スーパーコンピューティング部門, 特任講師

  • 2010.08
    -
    2019.03

    東京大学物性研究所, 物質設計評価施設, 助教

  • 2019.04
    -
    Present

    慶應義塾大学, 理工学部物理情報工学科, 准教授

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Academic Background 【 Display / hide 】

  • 1999.04
    -
    2001.03

    The University of Tokyo, 工学系研究科, 物理工学専攻

    Graduate School, Completed, Master's course

  • 2001.04
    -
    2004.03

    The University of Tokyo, 工学系研究科, 物理工学専攻

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 博士(工学), The University of Tokyo, Coursework, 2003.03

    Simulation Study on Nonequilibrium Phenomena and Structures

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Books 【 Display / hide 】

  • ゼロから学ぶPythonプログラミング Google Colaboratoryでらくらく導入

    渡辺宙志, 講談社, 2020.12,  Page： 256

  • The Art of High Performance Computing for Computational Science, Vol. 1

    ed. by Masaaki Geshi, Springer, 2019

    Scope: Chapter 9,  Contact page： pp. 169-189

  • 計算科学のためのHPC技術１

    下司雅章 編／片桐孝洋，中田真秀，渡辺宙志，山本有作，吉井範行，Jaewoon Jung，杉田有治，石村和也，大石進一，関根晃太，森倉悠介，黒田久泰 著, 大阪大学出版会, 2017.03

    Scope: 第7章,  Contact page： pp. 129-157

  • 超多自由度系の新しい科学

    金田 行雄・笹井 理生監修・笹井 理生編, 共立出版, 2010.11

    Scope: 4.3節,  Contact page： pp. 525-282

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Papers 【 Display / hide 】

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Presentations 【 Display / hide 】

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • Development of a Large-Scale Molecular Dynamics Framework and Application to Complex Fluids

    2021.04
    -
    2026.03

    Keio University, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), No Setting

    　View Summary

    「富岳」に代表されるように、我が国では大規模な計算資源を保有している一方、その計算能力を十全に活かすには高度な計算機科学の知識が要求され、計算科学との両立が困難であるという背景があった。本研究は、特に大規模分子動力学法に向けたフレームワークを構築することで、数値計算を実行する研究者が自分でコードを開発する環境を提供し、計算機科学と計算科学の分断を緩和しようとするものである。特に、並列計算機を扱うにあたって通信部分と計算部分の密結合を分離することで、研究者が本質的なプログラミングに集中し、研究成果へとつなげることを期待する。具体的な応用例として、高分子や気液混相流への適用を目指す。

  • Molecular Dynamics Study on Complex Fluid with Impurities and Bubbles

    2015.04
    -
    2020.03

    The University of Tokyo, Watanabe Hiroshi, Grant-in-Aid for Scientific Research (C), No Setting

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    The behavior of complex fluids, which contains polymers or bubbles, was investigated by molecular dynamics simulations. We have studied the Kalman vortexes occurring at the rear of the cylinder and found that the vortexes become blurred for fluid with polymers. This phenomenon did not occur when the length of the polymer was short, indicating that the length of the polymer was important. In a flow with bubble formation, the position of the vortex generation shifted to the rear and the reaction from the vortexes on the cylinder disappears. These findings can only be obtained by studying the molecular scale by molecular dynamics methods.

  • Numerical study on nonequiribrium phenomena involving phase transitions

    2011.04
    -
    2015.03

    The University of Tokyo, WATANABE Hiroshi, Grant-in-Aid for Young Scientists (B), No Setting

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    We have studied Ostwald ripening of bubbles by molecular dynamics simulations involving billions of particles. The scaling exponents were estimated from the bubble-size distribution function and the values of them were successfully described by the classical theory of Ostwald ripening, the Lifshitz-Slyozov-Wagner (LSW) theory. This is the first direct confirmation of LSW theory in bubble nuclei. As temperature increases, the crossover of the scaling exponent is observed. This crossover implies that the growth of bubbles changes from interface-limited to diffusion-limited. We also observed the growth rate of the bubbles (the kinetic term) directly for the first time. While the kinetic term is well described by the theory in the scaling region, it has broad distribution in early stage. This behavior shows that the inhomogeneity of the pressure in the system and the inhomogeneity is the reason why the classical theory fails to describe the early stage of the bubble nucleation.

  • Fractal structure of lattice models and applications to equilibrium and non-equilibrium systems

    2007
    -
    2010

    Nagoya University, MINAMI Kazuhiko, KONISHI Tetsuro, Grant-in-Aid for Scientific Research (C), No Setting

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    It is derived that the two-dimensional cell sorting problem is mathematically equivalent to the one-dimensional random walk with pair creations and annihilations, i. e. the adhesion probabilities in the cell sorting model analytically relate to the expectation values in the random walk problem. This is an example that two completely different biological systems are governed by a common mathematical structure. This result is obtained through the equivalences of these systems with lattice spin models. It is also shown that arbitrary generation operators can be written by the spin operators, and hence all of the biological stochastic problems can in principle be analyzed with the use of the techniques and knowledges already obtained in the area of lattice spin systems.

  • Theoretical Study of Non-Hermitian Dynamics on the Basis of the Classical Mechanics

    2007
    -
    2010

    Nagoya University, WATANABE Hiroshi, Grant-in-Aid for Young Scientists (B), No Setting

    　View Summary

    The Nose-Hoover method is studied as a non-Hamilton dynamics system. A stochastic process of the Nose-Hoover method is discussed on the basis of the Markovian approximation. It is proved that the dynamics which achieves Gibbs' canonical distribution must involve non-canonical transformation.

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Awards 【 Display / hide 】

  • 東京大学物性研究所 所長賞 (ISSP柏賞)

    福田 毅哉, 荒木 繁行, 髙橋 智恵子, 渡辺 宙志, 矢田 裕行, 2019.03, 東京大学物性研究所, ストックルームシステムの更新

    Type of Award： Other

  • 東京大学物性研究所 所長賞 (ISSP学術奨励賞)

    2017.03, 東京大学物性研究所, 気泡核のオストワルド成長

    Type of Award： Other

  • 第4回CMSI研究会 ポスター賞

    2013.12

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 第2回CMSI研究会 ポスター賞

    2012.01

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 2002年度未踏ユース「スーパークリエータ」認定 (IPA)

    2003.08, 情報処理推進機構, 量子計算回路の設計と計算シミュレーターの開発

    Type of Award： Award from publisher, newspaper, foundation, etc.

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Courses Taught 【 Display / hide 】

  • SOFTWARE DEVELOPMENT EXERCISE FOR APPLIED PHYSICS AND PHYSICO-INFORMATICS

    2024

  • PRESENTATION TECHNIQUE

    2024

  • MATHEMATICAL METHODS IN THE PHYSICAL SCIENCES

    2024

  • LABORATORY IN SCIENCE

    2024

  • INTRODUCTION TO COMPUTER PROGRAMMING(LECTURE AND EXERCISE)

    2024

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Memberships in Academic Societies 【 Display / hide 】

  • 分子シミュレーション学会, 

    2020.09
    -
    Present

  • American Physical Society, 

    2008.03
    -
    2016.05

  • 情報処理学会, 

    2002.01
    -
    Present

  • 日本物理学会, 

    2000.03
    -
    Present
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Committee Experiences 【 Display / hide 】

  • 2022.05

    物性研究所スパコン共同利用・CCMS合同研究会, 東京大学物性研究所物質設計評価施設

  • 2020.12

    第34回分子シミュレーション討論会 実行委員, 分子シミュレーション学会

  • 2020.04
    -
    Present

    東京大学物性研究所附属物質設計評価施設 スーパーコンピュータ共同利用委員会 3号委員, 東京大学物性研究所物質設計評価施設

  • 2019.03
    -
    2021.03

    日本物理学会第75〜76期代議員, 日本物理学会

  • 2011
    -
    2019

    東京大学物性研究所共同利用スーパーコンピュータ成果報告会組織委員, 東京大学物性研究所物質設計評価施設

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