Kobayashi, Hiromichi

写真a

Affiliation

Faculty of Law (Hiyoshi)

Position

Professor

E-mail Address

E-mail address

External Links

Message from the Faculty Member 【 Display / hide

  • 「物理学」のシラバス:  皆さんは身の回りで起こっている現象の裏に潜む物理法則に興味はないでしょうか?例えば、昼間の空は青いが、夕暮れには空が赤くなるなるのはなぜでしょう。これは、光の散乱に関する法則から説明されます。飛行機が飛ぶのはなぜか。これは、カーブボールが曲がるのと同じ物理法則で説明できる。電子レンジを使うと冷めた料理が温められるのはなぜか。これは、テレビやラジオさらには携帯電話などで使われている電磁波が関係している。  このように講義では、身の回りの物理現象を取り上げ、その現象はどのような物理法則に支配されているかを明らかにしていく。自然現象に潜む物理法則を見つけ出し、その法則を科学技術に応用してきた偉大な科学者たちの功績を理解し、身の回りの現象に「なぜ」と疑問を持って、そこにはどのような法則が働いているのかという物理的な考え方を講義および実験から学んでいただきたい。  本授業では、講義と実験を隔週で行い、それぞれ出席点とレポートにより評価をする。実験は、物理学教室編集のテキストに従って、毎回異なるテーマについて行う。実験定員は60名。

Profile Summary 【 Display / hide

  • Studies on turbulence, plasma flows and combustion such as Large Eddy Simulation, MHD(Magnetohydrodynamics) Power Generation and High-temperature Air Combustion by using numerical simulations

Career 【 Display / hide

  • 1998.04
    -
    1999.03

    Researcher, Japan Science and Technology Corporation

  • 1999.04
    -
    2003.03

    Assistant Professor

  • 2003.04
    -
    2009.03

    Associate Professor

  • 2005.03
    -
    2007.03

    Senior Visiting Fellow at Center for Turbulence Research, Stanford University

  • 2009.04
    -
    Present

    Professor

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Academic Background 【 Display / hide

  • 1994.03

    Tokyo Institute of Technology, Department of Applied Physics

    University, Graduated

  • 1996.03

    Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Energy Sciences

    Graduate School, Completed, Master's course

  • 1998.03

    Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Energy Sciences

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • Doctor of Engineering, Tokyo Institute of Technology, Coursework, 1998.03

 

Research Areas 【 Display / hide

  • Fluid engineering (Fluid Engineering)

  • Mathematical physics/Fundamental condensed matter physics (Mathematical Physics)

  • Computational science

  • Plasma science (Plasma Science and Technology)

  • Thermal engineering (Thermal Engineering)

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Research Themes 【 Display / hide

  • The Performances of Various Models in Large Eddy Simulation, 

    1999
    -
    2010

  • Magnetohydrodynamics (MHD) Power Generation Using Frozen Inert-gas Plasma (FIP), 

    1998
    -
    2010

  • Study on High-Temperature Air Combustion, 

    1998
    -
    2010

 

Books 【 Display / hide

  • 法学・経済学・自然科学から考える環境問題

    Junichi Aoki, Toyoko Akiyama, Tetsu Ohira, Nobuhiro Kanaya, Hiromichi Kobayashi, Norihiko Sugimoto, Akira Rokusha, 慶應義塾大学出版会, 2017.08

  • 高効率MHD発電とその応用

    KOBAYASHI HIROMICHI, 電気学会, 2017.05

    Scope: 18-22

  • 流体力学の基礎

    Toshio Miyauchi, Uzuru Tanahashi Hiromichi Kobayashi, 数理工学社, 2014.11

  • MHD技術応用

    KOBAYASHI HIROMICHI, 電気学会, 2013.04

    Scope: 24-26

  • MHD技術応用

    KOBAYASHI HIROMICHI, 電気学会, 2013.04

    Scope: 21-23

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Papers 【 Display / hide

  • Regularized, parameter free scale similarity type models for Large Eddy Simulation

    Klein M., Ketterl S., Engelmann L., Kempf A., Kobayashi H.

    International Journal of Heat and Fluid Flow (International Journal of Heat and Fluid Flow)  81 2020.02

    ISSN  0142727X

     View Summary

    © 2019 Elsevier Inc. The fidelity of Large Eddy Simulations (LES) depends strongly on the closures of the sub-grid scale (SGS) stress tensor. Although it is well known that the SGS stresses in LES are not aligned with the strain rate tensor, the most widely used models are still of eddy viscosity type, due to their robust behavior in LES and reasonable performance in a posteriori testing. The unstable behavior of more advanced anisotropic models, that is typically found in LES, has been attributed to either the fact that these models provide backscatter or to the fact that they do not provide a sufficient amount of dissipation. Based on recent advances in the field, an alternative modeling strategy is suggested, which can be used to regularize an arbitrary anisotropic (e.g. scale similarity type) model. The resulting model is easy to implement, can be written in compact form and is free of model parameters. The model has been tested a-posteriori and results are presented for a Taylor-Green-Vortex, a free plane jet and a turbulent channel flow of friction Reynolds numbers 395, 590 and 934. The results are compared to well-known eddy viscosity models and when applicable, to simulations without explicit LES model. The new model exhibits good performance for a variety of mesh resolutions and for all configurations. Furthermore, a-priori analysis results in the context of liquid atomization indicate that the model might be suitable as well in more complex physical scenarios. The a-priori analysis performance of the model is found to be nearly equivalent to the underlying structural anisotropic model in terms of its correlation coefficient, but the model is free of backscatter and provides good stability in LES.

  • Numerical Study on Entrance Length in Thermal Counterflow of Superfluid 4He

    Kobayashi H., Yui S., Tsubota M.

    Journal of Low Temperature Physics (Journal of Low Temperature Physics)  196 ( 1-2 ) 35 - 41 2019.07

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  00222291

     View Summary

    © 2019, Springer Science+Business Media, LLC, part of Springer Nature. Three-dimensional numerical simulations in a square duct were conducted to investigate entrance lengths of normal fluid and superfluid flows in a thermal counterflow of superfluid 4He. The two fluids were coarse-grained by using the Hall–Vinen–Bekharevich–Khalatnikov (HVBK) model and were coupled through mutual friction. We solved the HVBK equations by parameterizing the coefficient of the mutual friction to consider the vortex line density. A uniform mutual friction parameter was assumed in the streamwise direction. Our simulation showed that the entrance length of the normal fluid from a hot end becomes shorter than that of a single normal fluid due to the mutual friction with the parabolically developed superfluid flow near the hot end. As the mutual friction increases, the entrance length decreases. Same as that, the entrance length of the superfluid from a cold end is affected by the strength of the mutual friction due to the parabolically developed normal fluid flow near the cold end. Aside from the entrance effect, the realized condition of a tail-flattened flow is discussed by parameterizing the superfluid turbulent eddy viscosity and the mutual friction.

  • 格子ボルツマン法による自転車競技の集団走行の大規模LES空力解析

    長谷川 雄太,青木 尊之,小林 宏充,白﨑 啓太

    日本機械学会論文集 (日本機械学会)  85 ( 870 ) 18-00441 2019.02

    Research paper (scientific journal), Joint Work, Accepted

  • Numerical study on chiral turbulence of rotating neutrino matter in supernovae

    Kobayashi H., Yamamoto N., Okuno Y.

    11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 (11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019)   2019

     View Summary

    © 2019 International Symposium on Turbulence and Shear Flow Phenomena, TSFP. All rights reserved. We numerically study the chiral turbulence of rotating neutrino matter in the core of supernovae. The rotation yields inverse cascade and the novel current along the direction of rotation called the chiral vortical effect. We for the first time demonstrate that the chiral vortical effect induces a flow in the direction of vorticity and a conversion from fluid helicity to neutrino density. These results may potentially lead to asymmetrical supernova explosions and the increase in the explosion energy in three-dimensional simulations.

  • Improvement of the SGS model by using a scale-similarity model based on the analysis of SGS force and SGS energy transfer

    Kobayashi H.

    International Journal of Heat and Fluid Flow (International Journal of Heat and Fluid Flow)  72   329 - 336 2018.08

    Research paper (scientific journal), Single Work, Accepted,  ISSN  0142727X

     View Summary

    © 2018 Elsevier Inc. The subgrid-scale (SGS) model is improved by using a scale-similarity model based on the analysis of the SGS force and SGS energy transfer around an elliptic Burgers vortex. Abe (2013) proposed an anisotropy-resolving SGS model in which the Bardina term of a scale-similarity model is mixed with an eddy viscosity model under a new concept wherein the Bardina term does not affect the SGS energy transfer although it affects the SGS force. By using the concept, we propose a scale-similarity model with the Clark term. The SGS energy transfer is determined by the scale-similarity term and not by the eddy viscosity term while the SGS force is improved by using the SGS kinetic energy (Abe, 2013). It is observed that the Clark term yields higher spatial correlation with the true distributions of the SGS force and SGS energy transfer around the elliptic vortex when compared to the Bardina term. The SGS model based on the Clark term exhibits good performance for turbulent channel flows with respect to Reτ=180 and 590 even in extremely coarse grid resolutions. Specifically, the SGS model with the SGS kinetic energy fairly improves the mean streamwise velocity profile.

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

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Presentations 【 Display / hide

  • 超流動4Heの量子乱流における量子渦と常流動の局所結合ダイナミクス

    湯井悟志、小林宏充、坪田誠

    流体力学会年会2019 (岐阜) , 2019.09, Oral Presentation(general), 日本流体力学会

  • サブグリッドスケール乱流モデルにおける生成散逸非平衡効果の検討

    稲垣和寛、小林宏充

    流体力学会年会2019 (岐阜) , 2019.09, Oral Presentation(general), 日本流体力学会

  • 超流動4Heにおける量子渦と常流動の局所結合ダイナミクス

    湯井悟志、小林宏充、坪田誠

    日本物理学会 2019年秋季大会 (岐阜) , 2019.09, Oral Presentation(general), 日本物理学会

  • Three-dimensional numerical simulations of two-fluid coupled dynamics in thermal counterflows of superfluid 4He

    Hiromichi Kobayashi, Satoshi Yui, Makoto Tsubota

    The 17th European Turbulence Conference (ETC2019) (Torino) , 2019.09, Oral Presentation(general)

  • Elementary process of coupled dynamics between quantized vortex and normal fluid in superfluid 4He

    Satoshi Yui, Hiromichi Kobayashi, Makoto Tsubota

    International Symposium on Quantum Fluids and Solids (QFS2019) (Edmonton) , 2019.08, Poster (general)

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

  • 量子乱流と常流体乱流の結合計算による2流体乱流の特性解明

    2018.04
    -
    2021.03

    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hiromichi Kobayashi, Research grant, Principal Investigator

  • 乱流中のスケール間エネルギー輸送の解析的評価

    2014.04
    -
    2017.03

    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hiromichi Kobayashi, Research grant, Principal Investigator

  • 流体音響理論を用いたエアリード楽器の解析

    2011.04
    -
    2014.03

    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Kinya Takahashi, Research grant, Co-investigator

  • 液体金属MHD発電機内乱流の再層流化現象と渦電流による壁面ジェット流の解明

    2011.04
    -
    2014.03

    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hiromichi Kobayashi, Research grant, Principal Investigator

  • 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

    2011.04
    -
    2014.03

    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Takayuki Aoki, Research grant, Co-investigator

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Works 【 Display / hide

  • FD(Faculty Development)WORKSHOP第1回/双方向授業を目指して-携帯電話によるアンケート・小テストの実施-

    KOBAYASHI HIROMICHI

    慶應義塾大学日吉キャンパス来往舎, 

    2004.10
    -
    Present

    Other, Joint

Awards 【 Display / hide

  • 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

    Naoyuki Onodera, Takayuki Aoki, Takashi Shimokawabe, Hiromichi Kobayashi, 2013.01, 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

    Type of Award: Awards of National Conference, Council and Symposium

  • 京コンピュータ・シンポジウム2012最優秀ポスター

    Xian Wang, Satori Tsuzuki, Takayuki Aoki, Hiromichi Kobayashi, Naoyuki Onodera, Tatsuji Miyashita, 2012.06

    Type of Award: Awards of National Conference, Council and Symposium

  • Award for Distinguished Young Researcher in Fluid Mechanics of 2009, The Japan Society of Fluid Mechanics

    KOBAYASHI HIROMICHI, 2010.02, 日本流体力学会, Development of subgrid scale model based on turbulence structures

    Type of Award: Awards of National Conference, Council and Symposium

     View Description

    The award is based on the following three achievements: (1) H. Kobayashi: "The subgrid-scale models based on coherent structures for rotating homogeneous turbulence and turbulent channel flow," Physics of Fluids, Vol. 17, 045104 (2005), (2) H. Kobayashi, F. Ham and X. Wu: "Application of a local SGS model based on coherent structures to complex geometries," International Journal of Heat and Fluid Flow, Vol. 29, pp.640 - 653 (2008), and (3) H. Kobayashi: "Large eddy simulation of magnetohydrodynamic turbulent duct flows," Physics of Fluids, Vol.20, 015102 (2008).

 

Courses Taught 【 Display / hide

  • PHYSICS 2

    2020

  • PHYSICS 1

    2020

  • SEMINAR IN NATURAL SCIENCE 2

    2019

  • PHYSICS 2

    2019

  • PHYSICS 1

    2019

 

Social Activities 【 Display / hide

  • はままつ産業創造センター

    2007.12
    -
    2008.07

Memberships in Academic Societies 【 Display / hide

  • American Physical Society, 

    2008
    -
    Present
  • The Japan Society of Fluid Mechanics, 

    2004
    -
    Present
  • The Japan Society of Mechanical Engineers, 

    1999
    -
    Present
  • The Physical Society of Japan, 

    1999
    -
    Present
  • The Institute of Electrical Engineers of Japan, 

    1997
    -
    Present

Committee Experiences 【 Display / hide

  • 2019.07
    -
    Present

    委員長, 電磁界応答流体によるエネルギー・環境技術の新展開に関する調査専門委員会

  • 2018.04
    -
    2020.03

    代議員, 日本流体力学会

  • 2018.02
    -
    2019.07

    Advisory Committee Member, 11th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-11), Southampton 2019

  • 2016.07
    -
    2019.06

    委員, 環境負荷の低減を目指したMHD発電技術と応用に関する調査専門委員会

  • 2016.02
    -
    2017.07

    Advisory Committee Member, 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-10), Chicago 2017

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