Study on wall model for LES based on coherent structures in turbulence

• Project/Area Number: 20760119
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Fluid engineering
• Research Institution: Keio University
• Principal Investigator: KOBAYASHI Hiromichi Keio University, 法学部, 教授 (60317336)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 流体 / 計算物理 / 流体工学 / 数値流体力学 / 乱流モデル / LES / コヒーレント構造

Research Abstract

In LES of turbulence simulation, investigated were the statistical properties of a coherent structure function, which shows an eddy structure and is a normalized second invariant of velocity gradient tensor. It was found that for turbulent channel flows as well as homogeneous isotropic turbulence, the average, the variance, and pdf of the function are independent of Reynolds number, depend on the distance from a wall, and is available as a variable for a wall model.

Research Products

• [Presentation] Large eddy simulation based on the turbulence structure (2010)
  • Author(s): H. Kobayashi
  • Organizer: International Conference on Computational & Experimental Engineering and Sciences 2010
  • Place of Presentation: ラスベガス(米国)
  • Year and Date: 2010-03-28
• [Presentation] Large eddy simulation of MHD turbulent duct flows (2010)
  • Author(s): H.Kobayashi
  • Organizer: International Conference on Computational & Experimental Engineering and Sciences 2010
  • Place of Presentation: ラスベガス(米国)
  • Year and Date: 2010-03-28
• [Presentation] LESにおける局所空間相関を高めたコヒーレント構造モデル (2009)
  • Author(s): 小林宏充
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-28
• [Presentation] LESにおける局所空間相関を高めたコヒーレント構造モデル (2009)
  • Author(s): 小林宏充
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学(熊本県)
  • Year and Date: 2009-09-28
• [Presentation] Large eddy simulation of MHD turbulent duct flows (2009)
  • Author(s): H.Kobayashi
  • Organizer: 17th International Conference on MHD Energy Conversion
  • Place of Presentation: 湘南国際村(神奈川県)
  • Year and Date: 2009-09-16
• [Presentation] Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows (2009)
  • Author(s): H. Kobayashi, Y. Tominaga, T. Kubota, M. Tanahashi, T. Miyauchi
  • Organizer: 6th Turbulence and Shear Flow Phenomena
  • Place of Presentation: ソウル国立大学(韓国)
  • Year and Date: 2009-06-22
• [Presentation] 一様等方性乱流およびチャネル乱流におけるコヒーレント構造関数の統計的特性 (2008)
  • Author(s): 小林宏充、冨永泰裕、窪田泰助、店橋護、宮内敏雄
  • Organizer: 第22回数値流体力学シンポジウム
  • Place of Presentation: 東京
  • Year and Date: 2008-12-17
• [Presentation] Statistical properties for homogeneous isotropic turbulence and turbulent channel flows using a coherent structure function (2008)
  • Author(s): H. Kobayashi, Y. Tominaga, T. Kubota, M. Tanahashi, T. Miyauchi
  • Organizer: 61st Annual Meeting of Division of Fluid Dynamics of The American Physical Society
  • Place of Presentation: サンアントニオ(米国)
  • Year and Date: 2008-11-23
• [Presentation] Statistical properties for homogeneous isotropic turbulence and turbulent channel flows using a coherent structure function (2008)
  • Author(s): H. Kobayashi, Y. Tominaga, T. Kubota, M. Tanahashi, T. Miyauchi
  • Organizer: 61st Annual Meeting of Division of Fluid Dynamics of The American Physical Society
  • Place of Presentation: San Antonio, USA
  • Year and Date: 2008-11-23
• [Presentation] コヒーレント構造に基づくLES壁モデルの予備的検討 (2008)
  • Author(s): 小林宏充、冨永泰裕、窪田泰助、店橋護、宮内敏雄
  • Organizer: 流体力学会年会2008
  • Place of Presentation: 神戸
  • Year and Date: 2008-09-07
• [Remarks]
  • URL: http://k-ris.keio.ac.jp/Profiles/0040/0007193/pblc1.html
• [Remarks]
  • URL: http://k-ris.keio.ac.jp/Profiles/0040/0007193/pblcl.html
• [Remarks]
  • URL: http://k-ris.keio.ac.jp/Profiles/0040/0007193/pblcl.html