Authors：Takahiro TSUKAHARA¹ Tomohiro NIMURA² Kazuki KOHYAMA² Kousuke NAKAGAWA² Junnosuke HIRAGA² Rio HOSOI² Yuki MATSUKAWA² Masaya TASHIRO² Toshiyuki KURIHARA² Takumi TAKAHASHI² Shunsuke SOMEYA² Shotaro OKAZAKI² Yu OTA² Soki SHINKAI² Kota KIKUCHI¹ Shusaku KAKIUCHI¹

Affiliation：Department of Mechanical Engineering, Tokyo University of Science¹　Department of Mechanical Engineering, Tokyo University of Science²

Abstract：壁面せん断流の亜臨界乱流遷移現象における準秩序構造や遷移過程などの解明のため，本研究では各種クエット流や後退翼平板境界層などの直接数値シミュレーション（DNS）を行った．また，スカラー物質乱流拡散や粘弾性流体壁乱流に対する機械学習の適用可能性を，DNSデータに基づいて調査した．OCTOPUS環境下では，OpenFOAMによる二自由表面液膜の温度差マランゴニ対流などの解析も実施した．

 

Publication related to your research:
（Journal paper）

• T. Homma, T. Yamashita, R. Wada, K. Kawazu, K. Kurose, T. Tsukahara, and I. Ueno, “Multicellular structures in thin free liquid films induced by thermocapillary effect,” Journal of Colloid and Interface Science, Vol. 641 (2023), 187-196.
• K. Nakagawa, T. Tsukahara, and T. Ishida, “DNS study on turbulent transition induced by an interaction between freestream turbulence and cylindrical roughness in swept flat-plate boundary layer,” Aerospace, Vol. 10, Issue 2 (2023), 128.
• K. Kohyama, M. Sano, and T. Tsukahara, “Sidewall effect on turbulent band in subcritical transition of high-aspect-ratio duct flow,” Physics of Fluids, Vol. 34 (2022), 084112.
• T. Kawata and T. Tsukahara, “Spectral analysis on dissimilarity between turbulent momentum and heat transfers in plane Couette turbulence,” Physics of Fluids, Vol. 34 (2022), 075135.
• Y. Matsukawa and T. Tsukahara, “Subcritical transition of Taylor-Couette-Poiseuille flow at high radius ratio,” Physics of Fluids, Vol. 34 (2022), 074109.
• T. Kawata and T. Tsukahara, “Spectral analysis on transport budgets of turbulent heat fluxes in plane Couette turbulence,” Energies, Vol. 15, Issue 14 (2022), 5258.
• T. Nimura and T. Tsukahara, “Viscoelasticity-induced instability in plane Couette flow at very low Reynolds number,” Fluids, Vol. 7, Issue 7 (2022), 241.

 

（International conference paper）

• S. Okazaki, K. Nakagawa, T. Ishida, and T. Tsukahara, “Numerical study on development of a turbulent spot in the swept-flat-plate three-dimensional boundary layer,” In: Proceedings of the 2022 Asia-Pacific International Symposium on Aerospace Technology (APISAT2022), Niigata, Japan, (Hybrid Event), Octy. 12-14 (2022), S46-5 (5 pages).
• J. Hiraga, K. Nakagawa, T. Ishida, and T. Tsukahara, “Effect of distributed roughness on turbulent transition in the three-dimensional boundary layer,” In: Proceedings of the 2022 Asia-Pacific International Symposium on Aerospace Technology (APISAT2022), Niigata, Japan, (Hybrid Event), Oct. 12-14 (2022), S46-4 (4 pages).
• S. Shinkai, K. Nakagawa, T. Ishida, and T. Tsukahara, “Direct numerical simulation of turbulent transition in swept-flat-plate boundary layer over a cavity,” In: Proceedings of the 2022 Asia-Pacific International Symposium on Aerospace Technology (APISAT2022), Niigata, Japan, (Hybrid Event), Oct. 12-14 (2022), S46-3 (6 pages).
• K. Nakagawa, T. Ishida, and T. Tsukahara, “Transition process of crossflow vortices due to the cylindrical roughness and cavity in the three-dimensional boundary layer,” In: Proceedings of the 2022 Asia-Pacific International Symposium on Aerospace Technology (APISAT2022), Niigata, Japan, (Hybrid Event), Oct. 12-14 (2022), S46-1 (6 pages).
• T. Kurihara, T. Ishigami, and T. Tsukahara, “Inter- and extra-polations of source estimation by CNN to identify a scalar point source in turbulent channel flow,” In: Proceedings of 9th Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF2022), Utsunomiya, Japan, Nov. 27-30 (2022), 4119 (7 pages).
• T. Takahashi, T. Nimura, and T. Tsukahara, “Flow pattern of rotating plane Couette flow at low Reynolds number with viscoelastic fluid,” In: Proceedings of 9th Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF2022), Utsunomiya, Japan, Nov. 27-30 (2022), 4065 (6 pages).
• S. Someya, T. Ishigami, and T. Tsukahara, “CNN-based estimation of scalar diffusion source distance under grid-generated turbulence,” In: Proceedings of 9th Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF2022), Utsunomiya, Japan, Nov. 27-30 (2022), 4054 (7 pages).
• Y. Matsukawa and T. Tsukahara, “Different transition processes of Taylor-Couette-Poiseuille flow based on modulated wavy Taylor vortex,” In: Proceedings of 9th Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF2022), Utsunomiya, Japan, Nov. 27-30 (2022), 4028 (5 pages).
• M. Tashiro and T. Tsukahara, “Prediction of constitutive stress for viscoelastic fluid turbulence with LSTM,” In: Proceedings of 9th Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF2022), Utsunomiya, Japan, Nov. 27-30 (2022), 4023 (5 pages).
• Y. Matsukawa, and T. Tsukahara, “Laminarization in subcritical Taylor-Couette-Poiseuille flow with increasing pressure gradient,” In: Proceedings of Nineteenth International Conference on Flow Dynamics (ICFD2022), Sendai, Japan, Nov. 9-11 (2022), pp. 732-735.
• M. Tashiro and T. Tsukahara, “DNS-CNN simulation of viscoelastic turbulent flow using U-Net,” The 15th World Congress in Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics (WCCM-APCOM 2022), Yokohama, Japan (Online), July 31 - Aug. 5 (2022), 1348.
• K. Nakagawa, T. Ishida, and T. Tsukahara, “Freestream-turbulence independence of secondary instability of cross-flow vortices in swept-flat-plate boundary layer,” In: Proceedings of the 12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP12), Osaka, Japan (Online), Jul. 19-22 (2022), 186 (6 pages).
• K. Kohyama, M. Sano, K. Tamai, and T. Tsukahara, “Directed percolation phenomena in subcritical transtion of high-aspect-ratio duct flow,” In: Proceedings of the 12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP12), Osaka, Japan (Online), Jul. 19-22 (2022), 312 (6 pages).

 

（Domestic conference/wokrshop）

• 仁村 友洋，河田 卓也，塚原 隆裕，“平面クエット流れにおける粘弾性に起因する渦変調と不安定性に関する研究”，第38回生研TSFDシンポジウム，東京，3月9日 (2023)，2 pages.
• 栗原 稔幸，石神 隆寛，塚原 隆裕，“チャネル乱流中のスカラー拡散源位置に関するCNNを用いた回帰推定のDNS検証”，日本機械学会 第100期 流体工学部門講演会 講演論文集，熊本，11月12日-13日 (2022)，OS04-15，1 page.
• 田代 雅哉，塚原 隆裕，“LSTMを用いた粘弾性チャネル乱流における構成応力の予測”，日本流体力学会年会2022 講演論文集，京都，9月27日-29日 (2022)，3 pages.
• 高橋 拓海，仁村 友洋，塚原 隆裕，“低レイノルズ数回転平面クエット流れにおける粘弾性流体の不安定性”，日本流体力学会年会2022 講演論文集，京都，9月27日-29日 (2022)，4 pages.
• 松川 裕樹，塚原 隆裕，“Taylor-Couette-Poiseuille流における変調波状Taylor渦流から間欠乱流への亜臨界遷移現象”，日本流体力学会年会2022 講演論文集，京都，9月27日-29日 (2022)，3 pages.
• 河田 卓也，塚原 隆裕，“平面クエット乱流における多重スケール相互作用による乱流エネルギー輸送”，日本流体力学会年会2022 講演論文集，京都，9月27日-29日 (2022)，6 pages.
• 松川 裕樹，小野寺 駿，塚原 隆裕，“水平圧力勾配を付加した鉛直平行平板間共存対流の亜臨界遷移パターン”，第59回日本伝熱シンポジウム 講演論文集，岐阜，5月18日-20日 (2022)，BPA1432, 6 pages.

 

（Etc）

• 塚原 隆裕，“乱流×機械学習”，日本機械学会熱工学部門・流体工学部門・計算力学部門合同講習会「機械学習×熱・流体工学の最先端（No.23-20），オンライン，3月24日 (2023)．
• 塚原 隆裕，“粘弾性流体や乱流拡散を対象とした深層学習”，日本機械学会2022年度年次大会 EFDワークショップ：流体工学とAI，富山，9月11-14日 (2022)，W52-03．
• T. Tsukahara, “Subcritical transitions of channel flows: Patterning of localized turbulence,” IISc-TUS Joint Webinar, Online, Jun. 9 (2022).
• 塚原 隆裕，“粘弾性流体乱流に対する機械学習代理モデル”，電子情報通信学会 情報論的学習理論と機械学習研究会 (IBISML) 第45回IBISML研究会，Zoom（online開催），3月9日 (2022).