2012 Fiscal Year Final Research Report
Analysis and modeling of hybrid turbulence equation based on temporal filtering
| Project/Area Number |
22560156
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HAMBA Fujihiro 東京大学, 生産技術研究所, 教授 (20251473)
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| Co-Investigator(Renkei-kenkyūsha) |
YOKOI Nobumitsu 東京大学, 生産技術研究所, 助教 (50272513)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 乱流モデル / RANS / LES / ハイブリッドモデル |
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| Research Abstract |
Analysis of the velocity equation in turbulent channel flow was made using spatial filtering. It was shown that the extra term due to the non-commutivity plays an important role in the stress fluctuation and the turbulent energy budget near the interface between the RANS and LES regions. A new length scale was introduced using the time integral to derive theoretically the transport equations for the eddy diffusivity and the eddy viscosity. The Reynolds stress, the eddy viscosity, and the new length scale were shown to be closely related to each other via the production term of each transport equation.
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