Study on high-Reynolds number effects on wall-turbulence by means of the world's largest Direct Numerical Simulation

• Project/Area Number: 15K05790
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: University of Yamanashi
• Principal Investigator: YAMAMOTO Yoshinobu 山梨大学, 大学院総合研究部, 准教授 (40377809)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 高レイノルズ数 / 乱流輸送現象 / 直接数値計算 / 乱流モデリング / 高レイノルズ数乱流輸送 / 壁面乱流場 / 大規模直接数値計算 / 乱流構造

Outline of Final Research Achievements

Direct numerical simulations of turbulent channel flows up to Re_tau = 8000 were carried out by means of the high-order accuracy finite difference method. Our DNS code achieved the high-effective computational performance corresponded to 70 TFlop/s at 2048 nodes on the Earth Simulator.
It is notable that the logarithmic variations both in the mean velocity, and the streamwise Reynolds stress, are firstly confirmed for Re_tau = 8000. Present DNS database were published on the Web to analysis high-Reynolds number effects on wall-turbulence.

Research Products

• [Journal Article] Numerical evidence of logarithmic regions in channel flow at Reτ=8000 (2018)
  • Author(s): Yoshinobu Yamamoto and Yoshiyuki Tsuji
  • Journal Title: Phys. Rev. Fluids Volume: 3 Issue: 1
  • DOI: 10.1103/physrevfluids.3.012602
  • NAID: 120006650161
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Direct numerical simulation of liquid metal free-surface turbulent flows imposed on wall-normal magnetic field (2018)
  • Author(s): Y. Yamamoto and T. Kunugi
  • Journal Title: Fusion Engineering and Design Volume: - Pages: 925-930
  • DOI: 10.1016/j.fusengdes.2018.04.041
  • Peer Reviewed
• [Journal Article] Reynolds number dependency of turbulent structures associated with amplitude wall pressure peaks in channel flow (2018)
  • Author(s): A. Mehrez, Y. Yamamoto, and Y. Tsuji
  • Journal Title: Fluid Dynamic Research Volume: - Issue: 1 Pages: 011407-011407
  • DOI: 10.1088/1873-7005/aabfa9
  • Peer Reviewed
• [Journal Article] A New RANS Model in Turbulent Channel Flow Imposed Wall-Normal Magnetic Field with Heat Transfer (2017)
  • Author(s): Yamamoto Yoshinobu、Osawa Naoki、Kunugi Tomoaki
  • Journal Title: Fusion Science and Technology Volume: 72 Issue: 4 Pages: 601-608
  • DOI: 10.1080/15361055.2017.1350475
  • Peer Reviewed
• [Journal Article] A New RANS Model in Turbulent Channel Flow Imposed Wall-Normal Magnetic Field with Heat Transfer (2017)
  • Author(s): Y. Yamamoto, N. Osawa, T. Kunugi
  • Journal Title: Fusion Science and Technology Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Effects of large-scale structures on inner layer in high Reynolds number turbulent channel flow (2017)
  • Author(s): Y. Yamamoto and Y. Tsuji
  • Journal Title: 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10) Volume: 印刷中
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] HIGH-AMPLITUDE WALL PRESSURE EVENTS AND THEIR RELATION TO TURBULENT STRUCTURE IN CHANNEL FLOW (2017)
  • Author(s): A. Mehrez, Y. Yamamoto, T. Tsuneyoshi, and Y. Tsuji
  • Journal Title: 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10) Volume: 印刷中
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] MHD effects on turbulent dissipation process in channel flows with an imposed wall-normal magnetic field (2016)
  • Author(s): Y. Yamamoto and T. Kunugi
  • Journal Title: Fusion Engineering and Design Volume: in press Pages: 1137-1142
  • DOI: 10.1016/j.fusengdes.2016.01.003
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Modeling of MHD turbulent heat transfer in channel flows imposed wall-normal magnetic fields under the various Prandtl number fluids (2016)
  • Author(s): Y. Yamamoto and T. Kunugi
  • Journal Title: Fusion Engineering and Design Volume: in press Pages: 1130-1136
  • DOI: 10.1016/j.fusengdes.2016.01.004
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Recent progress of high-Re-number researches in Japan (2018)
  • Author(s): Y. Tsuji, Y. Yamamoto, and N. Furuichi
  • Organizer: Fundamental Aspects of Geophysical Turbulence III
  • Int'l Joint Research
• [Presentation] The world's largest direct numerical simulation of turbulent channel flow (2018)
  • Author(s): Y. Yamamoto, R. Egawa, Y. Isobe, and Y. Tsuji
  • Organizer: 27th Workshop on Sustained Simulation Performance
  • Int'l Joint Research / Invited
• [Presentation] 高レイノルズ数チャンネル乱流場における大規模構造の内層への寄与 (2017)
  • Author(s): 山本義暢，辻義之
  • Organizer: 京都大学数理解析研究所共同研究非一様乱流の数理
  • Invited
• [Presentation] 大規模直接数値計算によるMHD乱流熱伝達機構の解明とモデリング (2017)
  • Author(s): 山本義暢
  • Organizer: 核融合科学研究所プラズマシミュレータシンポジウム2017
  • Invited
• [Presentation] Effects of large-scale structures on inner layer in high Reynolds number turbulent channel flow (2017)
  • Author(s): Y. Yamamoto and Y. Tsuji
  • Organizer: Tenth International Symposium of Turbulent Shear Flow Phenomena (TSFP10)
  • Int'l Joint Research
• [Presentation] High-Amplitude Wall Pressure Events and Their Relation to Turbulent Structure in Channel Flow (2017)
  • Author(s): A. Mehrez, Y. Yamamoto, T. Tsuneyoshi, and Y. Tsuji
  • Organizer: Tenth International Symposium of Turbulent Shear Flow Phenomena (TSFP10)
  • Int'l Joint Research
• [Presentation] Wall Pressure Fluctuation in High-Re-number Channel Flow (2017)
  • Author(s): A. Mehrz, Y. Yamamoto, and Y. Tsuji
  • Organizer: 61th workshop on Investigation and Control of Transition to Turbulence
  • Int'l Joint Research
• [Presentation] Characteristics of heart transfer across free-surface in open-channel flows imposed on a wall-normal magnetic field (2017)
  • Author(s): Y. Yamamoto and T. Kunugi
  • Organizer: 13th International Symposium on Fusion Nuclear Technology(ISFNT13)
  • Int'l Joint Research
• [Presentation] 高レイノルズ数チャンネル乱流場におけるattached eddy 仮説の検証 (2016)
  • Author(s): 山本義暢 辻義之
  • Organizer: 日本流体力学会年会2016
  • Place of Presentation: 名古屋工業大学(愛知県・名古屋市)
  • Year and Date: 2016-09-28
• [Presentation] チャンネル乱流場散逸機構における高レイノルズ数効果 (2015)
  • Author(s): 山本義暢、辻義之
  • Organizer: 日本流体力学会 年会2015
  • Place of Presentation: 東京工業大学大岡山キャンパス(東京都・目黒区)
  • Year and Date: 2015-09-26
• [Presentation] Large-scale direct numerical simulation of high Reynolds number turbulent channel flow by means of vector-parallel processors (2015)
  • Author(s): Y.Yamamoto and Y. Tsuji
  • Organizer: 13th International Conference on Parallel Computing Technologies
  • Place of Presentation: Petrozavodsk, Russia
  • Year and Date: 2015-08-31
  • Int'l Joint Research
• [Presentation] Characteristics of overlap region in high-Reynolds number turbulent channel flow (2015)
  • Author(s): Y. Yamamoto and Y. Tsuji
  • Organizer: 15th European Turbulence Conference
  • Place of Presentation: Delft, Netherland
  • Year and Date: 2015-08-25
  • Int'l Joint Research
• [Remarks] DNS database
  • URL: http://www.me.yamanashi.ac.jp/lab/yamamoto/DNS2
• [Remarks] DNS database
  • URL: http://www.me.yamanashi.ac.jp/lab/yamamoto/DNSdatabase.html
• [Remarks] DNSdatabase.html
  • URL: http://www.me.yamanashi.ac.jp/lab/yamamoto/DNSdatabase.html