Details of the Researcher

PHOTO

Kosuke Nakagawa
Section
Institute of Fluid Science
Job title
Specially Appointed Research Fellow

Research History 1

  • 2025/04 - Present
    Tohoku University　Institute of Fluid Science　Postdoctoral Researcher

Education 3

  • Tokyo University of Science　Graduate School of Science and Technology　Doctoral course, Department of Mechanical and Aerospace Engineering

    2022/04 - 2025/03

  • Tokyo University of Science　Graduate School of Science and Technology　Master's course, Mechanical Engineering

    2020/04 - 2022/03

  • Tokyo University of Science　Faculty of Science and Technology　Mechanical Engineering

    2016/04 - 2020/03

Committee Memberships 3

  • 2025年度AIPチャレンジ　企画運営委員

    2025/06 - 2026/03

  • 東京理科大学野田キャンパス博士会　副幹事長

    2022/06 - 2023/03

  • 流体若手夏の学校2022　実行委員会

    2022/08 - 2022/08

Research Areas 1

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering /

Awards 1

  1. 学生優秀講演賞

    2020/11　一般社団法人日本航空宇宙学会主催 第58回飛行機シンポジウム

Papers 6

  1. DNS study on the roughness wavelength selectivity of crossflow vortex transition due to distributed surface roughness Peer-reviewed

    Kotaro Minamio, Kosuke Nakagawa, Ryo Araki, Takahiro Ishida, Takahiro Tsukahara

    International Journal of Heat and Fluid Flow　121　110632　2026/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijheatfluidflow.2026.110632 　

    ISSN： 0142-727X

  2. Numerical and Experimental Study on the Freestream-Turbulence Dependency of Turbulent Transition Processes on a Swept Flat Plate Peer-reviewed

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    IUTAM Bookseries　167-173　2026/01/23

    Publisher: Springer Nature Singapore

    DOI： 10.1007/978-981-96-9829-5_22 　

    ISSN： 1875-3507

    eISSN： 1875-3493

  3. Interscale Energy Transfer in a Transitional Swept-Wing Boundary Layer Peer-reviewed

    Tomotaka Ichikawa, Kosuke Nakagawa, Takahiro Ishida, Takuya Kawata, Takahiro Tsukahara

    IUTAM Bookseries　215-221　2026/01/23

    Publisher: Springer Nature Singapore

    DOI： 10.1007/978-981-96-9829-5_28 　

    ISSN： 1875-3507

    eISSN： 1875-3493

  4. Changes in the Transition Process of Roughness-Induced Crossflow Vortices due to Freestream Turbulence Peer-reviewed

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Flow, Turbulence and Combustion　114　(3)　827-855　2024/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10494-024-00616-5 　

    ISSN： 1386-6184

    eISSN： 1573-1987

    More details Close

    Abstract Laminar-turbulent transitions in boundary layers are one of the major research topics in fluid dynamics. In this study, we focused on a three-dimensional boundary layer formed on a swept flat plate. In this boundary layer, the crossflow instability is dominant, and the instability induces crossflow vortices (CFVs). Many studies have focused on the dependency of the transition process on the intensities of steady or unsteady disturbances, which correspond to a roughness element and freestream turbulence (FST), respectively. On the other hand, the effects of the FST wavelength are still unclear. Moreover, there is a lack of knowledge about the transition processes caused by both steady and unsteady disturbances. We investigated how the transition process of a stationary structure caused by cylindrical roughness changes depending on the FST wavelength using direct numerical simulations. We classified transition processes into two types: processes in which stationary structures grow into CFVs and processes in which hairpin vortices are generated on the stationary structures. The former is further classified into four types depending on the presence or absence of FST and on the FST wavelength. We revealed the contributions of different FST wavelengths to the transition process changes. The short-wavelength FST provides hairpin vortices to the stationary structure at low roughness height conditions because of its high-frequency components. The long-wavelength FST changes the process due to unsteady fluctuations influencing the stationary structure. In summary, the transition processes undergo different mechanisms between short- and long-wavelength FST.

  5. Effects of freestream turbulence on the secondary instability of the roughness-induced crossflow vortex in swept flat plate boundary layers Peer-reviewed

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    International Journal of Heat and Fluid Flow　102　109161-109161　2023/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijheatfluidflow.2023.109161 　

    ISSN： 0142-727X

  6. DNS Study on Turbulent Transition Induced by an Interaction between Freestream Turbulence and Cylindrical Roughness in Swept Flat-Plate Boundary Layer Peer-reviewed

    Kosuke Nakagawa, Takahiro Tsukahara, Takahiro Ishida

    Aerospace　10　(2)　128-128　2023/01

    Publisher: MDPI AG

    DOI： 10.3390/aerospace10020128 　

    ISSN： 2226-4310

    eISSN： 2226-4310

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Misc. 4

  1. 2次元キャビティが及ぼす後退平板境界層の乱流遷移過程への影響

    新開 壮希, 中川 皓介, 塚原 隆裕

    東北大学サイバーサイエンスセンター大規模科学計算システム広報SENAC　58　(1)　21-26　2025

  2. 後退平板境界層における横流れ渦と主流乱れの相互作用による乱流遷移の直接数値解析

    中川皓介, 塚原隆裕

    東北大学サイバーサイエンスセンター大規模科学計算システム広報SENAC　41　(5)　64-73　2023

  3. 流体若手夏の学校 2022 の報告

    神山一貴, 松川裕樹, 中川皓介

    ながれ：日本流体力学会誌　41　(5)　362-362　2022

  4. 受賞者紹介—日本航空宇宙学会主催第58回飛行機シンポジウム学生優秀講演賞— Invited

    中川皓介

    TUSサイエンスフォーラム　425　62-62　2021/10

Presentations 30

  1. DNS Study of Distributed Roughness Effects on Laminar-Turbulent Transition in a Three-Dimensional Boundary Layer

    Kosuke Nakagawa, Aiko Yakeno

    17th World Congress on Computational Mechanics & 10th European Congress on Computational Methods in Applied Sciences and Engineering (WCCM-ECCOMAS 2026)　2026/07/24

  2. Homology-Based Quantification of Vortex Breakdown in Transitional Boundary Layers

    Kosuke NAKAGAWA

    FY2025 AIP Challenge Results Presentation Meeting　2026/03/02

  3. Information-theoretic analysis of velocity and pressure fields in natural and bypass transitions of a three-dimensional boundary layer on a swept plate

    Eitetsu Nakashima, Kosuke Nakagawa, Takahiro Tsukahara, Ryo Araki

    39th CFD Symposium　2025/12/17

  4. Investigation of surface-roughness effects on turbulent transition in a swept flat plate boundary layer

    Kosuke Nakagawa, Aiko Yakeno

    39th CFD Symposium　2025/12/16

  5. On the Friction Drag Reduction Mechanism by Distributed Micro Roughness in Transitional Boundary Layer Flow

    Rikuto Osaki, Kosuke Nakagawa, Aiko Yakeno, Takuya Kawata

    22nd International Conference on Flow Dynamics　2025/11/11

  6. 後退平板境界層の乱流斑点成長に伴う進行波の大規模解析

    岡田 侑晟, 中川 皓介, 荒木 亮, 石田 貴大, 塚原 隆裕, 徳川直子

    第63回飛行機シンポジウム　2025/10

  7. 後退平板境界層の横流れ渦の崩壊過程における非線形スケール間エネルギー輸送

    市川 智毅, 中川 皓介, 石田 貴大, 塚原 隆裕, 河田 卓也

    日本流体力学会年会2025　2025/09

  8. Interscale energy transfer in a transitional swept-flat plate boundary layer

    Tomotaka Ichikawa, Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara, Takuya Kawata

    2nd European Fluid Dynamics Conference　2025/08

  9. Direct numerical simulation of turbulent transition on a swept flat plate with the effects of distributed roughness height wavelength

    Kotaro Minamio, Kosuke Nakagawa, Ryo Araki, Takahiro Ishida, Takahiro Tsukahara

    11th Int. Symp. on Turbulence, Heat and Mass Transfer (THMT-25)　2025/07

  10. 後退平板上における分布粗さの高さと波長が乱流遷移過程に与える影響の直接数値計算

    南尾 紘太朗, 中川 皓介, 石田 貴大, 塚原 隆裕

    第62回飛行機シンポジウム　2024/10

  11. Numerical and experimental study on the freestream-turbulence dependency of turbulent transition processes on a swept flat plate

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Tenth IUTAM Symp. on Laminar-Turbulent Transition (IUTAM LTT 2024)　2024/09

  12. Interscale energy transfer in a transitional swept-wing boundary layer

    Tomotaka Ichikawa, Kosuke Nakagawa, Takahiro Ishida, Takuya Kawata, Takahiro Tsukahara

    Tenth IUTAM Symp. on Laminar-Turbulent Transition (IUTAM LTT 2024)　2024/09

  13. Effects of rotating cylindrical roughness and its rotating direction on crossflow-vortex transition of swept-flat-plate boundary layer

    Yuto Watanabe, Kosuke Nakagawa, Ryo Araki, Takahiro Ishida, Takahiro Tsukahara

    The 16th World Congress on Comput. Mech. & 4th Pan American Congress on Comput. Mech. (WCCM-PANACM 2024)　2024/07

  14. Effects of Crossflow Instability on the Development Process of a Turbulent Spot

    Kosuke Nakagawa, Shotaro Okazaki, Takahiro Ishida, Takahiro Tsukahara

    The 12th International Conference on Computational Fluid Dynamics (ICCFD12)　2024/07

  15. Turbulent spot growth in swept-flat-plate boundary layer

    Takahiro Tsukahara, Shotaro Okazaki, Kosuke Nakagawa, Takahiro Ishida

    The 69th Workshop on Investigation and Control of Transition to Turbulence　2024/05/10

  16. 回転円柱粗さを有する三次元後退平板境界層の乱流遷移過程に関する直接数値解析

    渡辺 勇翔, 中川 皓介, 石田 貴大, 塚原 隆裕

    第61回飛行機シンポジウム　2023/11

  17. 横流れ不安定性が乱流斑点の成長過程へ与える影響に関する研究

    岡崎 将太郎, 中川 皓介, 石田 貴大, 塚原 隆裕

    第61回飛行機シンポジウム　2023/11

  18. 2次元キャビティが後退平板境界層の乱流遷移過程に及ぼす影響

    新開 壮希, 中川 皓介, 石田 貴大, 塚原 隆裕

    第61回飛行機シンポジウム　2023/11

  19. Investigation of the transition process due to cylindrical roughness and freestream turbulence in the swept flat plate boundary layer

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    The 68th Workshop on Investigation and Control of Transition to Turbulence　2023/10/24

  20. 後退平板境界層における円柱粗さと主流乱れによる乱流遷移の数値解析と風洞試験調査

    中川 皓介, 細井 理央, 石田 貴大, 塚原 隆裕

    日本流体力学会年会2023　2023/09

  21. Premature secondary instabilities induced by freestream turbulence in swept flat plate boundary layer

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    10th Int. Symp. on Turbulence, Heat & Mass Transfer (THMT10)　2023/09

  22. Parametric study on the effects of cylindrical cavities on transition in the Falkner-Skan-Cooke boundary layer

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    18th European Turbulence Conference (ETC18)　2023/09

  23. Transition process of crossflow vortices due to the cylindrical roughness and cavity in the three-dimensional boundary layer

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Asia-Pacific Int. Symp. Aerospace Technology (APISAT2022)　2022/10

  24. Direct numerical simulation of turbulent transition in swept-flat-plate boundary layer over a cavity

    Souki Shinkai, Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Asia-Pacific Int. Symp. Aerospace Technology (APISAT2022)　2022/10

  25. Effect of distributed roughness on turbulent transition in the three-dimensional boundary layer

    Junnosuke Hiraga, Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Asia-Pacific Int. Symp. Aerospace Technology (APISAT2022)　2022/10

  26. Numerical study on development of a turbulent spot in the swept-flat-plate three-dimensional boundary layer

    Shotaro Okazaki, Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    Asia-Pacific Int. Symp. Aerospace Technology (APISAT2022)　2022/10

  27. Freestream-turbulence independence of secondary instability of cross-flow vortices in swept-flat-plate boundary layer

    Kosuke Nakagawa, Takahiro Ishida, Takahiro Tsukahara

    12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP12)　2022/07

  28. 後退平板境界層における乱流遷移のDNS：横流れ渦に生じる二次不安定機構の主流乱れ非依存性

    中川 皓介, 石田 貴大, 塚原 隆裕

    第35回数値流体力学シンポジウム　2021/12/13

  29. Turbulent transition induced by an interaction between freestream turbulence and discrete roughness in swept-flat-plate boundary layer

    Kosuke Nakagawa, Takahiro Tsukahara, Takahiro Ishida

    Asian Symposium on Computational Heat Transfer and Fluid Flow　2021/09

  30. 主流乱れと円柱粗さの相互作用による後退平板境界層乱流遷移の直接数値解析

    中川皓介

    第58回飛行機シンポジウム　2020/11/26

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