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2002 Fiscal Year Final Research Report Summary

Development of Second-Moment Closure of High Performance

Research Project

Project/Area Number 13650173
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionShizuoka University

Principal Investigator

SHIMA Nobuyuki  Shizuoka University, Department of Mechanical Engineering, Professor, 工学部, 教授 (40119128)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Masayoshi  Shizuoka University, Department of Mechanical Engineering, Research Associate, 工学部, 助手 (90293604)
Project Period (FY) 2001 – 2002
KeywordsTurbulence model / Second-moment closure / Low-Reynolds-number model
Research Abstract

The purpose of this project is to develop a turbulence model which reproduces a wide range of turbulent flows by testing and refining a low-Reynolds-number second-moment closure without wall-reflection redistribution terms proposed by Shima, the head investigator of the project, in 1997.
The second-moment closure (Model 97) has been tested in channel flows with spanwise, streamwise and wall-normal rotations, unsteady pipe flows, flows through concentric annuli, and periodically transpired channel flows. Direct numerical simulations (DNS) of the flows with system rotations and flows through concentric annuli have also been performed, and databases of these flows have been constructed. The model 97 reproduces the concentric annulus flows well, and also shows a clear superiority to eddy-viscosity models in the periodically transpired channel flows. In the unsteady pipe flows, however, the model gives less accurate response of turbulence to flow-rate variation than a Shima's previous model which includes wall-reflection terms. In the case of weak streamwise rotation, the predicted velocity profiles are in reasonable agreement with DNS data. At high rotation rates, however, the predicted sign of a shear stress component disagrees with that of DNS, leading to poor predictions of the velocity profiles. The wall-normal rotation leads to relaminarization of the flow when the rotation rate becomes high. Good predictions are obtained for weak rotation but the model gives relaminarization at a lower rotation number than DNS. As we have seen, the model 97 shows several weaknesses, though it is useful in many flows as a low-Reynolds-number second-moment closure without wall-reflection redistribution terms. Based on these results, we are developing a new model for higher performance.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 島 信行: "スパン方向、流れ方向および壁垂直方向に回転するチャネル乱流の数値予測"日本機械学会論文集(B編). 69巻678号. 137-144 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Okamoto: "Direct Numerical and Large Eddy Simulation of Turbulent Flows Through Concentric Annuli"Engineering Turbulence Modelling and Experiments. Vol.5. 219-228 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Okamoto: "Numerical Prediction of Periodic Transpired Channel Flow with Low-Reynolds-Number Turbulence Models"Proc.3rd Int. Symp. on Advanced Energy Conversion Systems and Related Technologies. 2B7 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Shima: "Prediction of Turbulent Channel Flows with Spanwise, Streamwise and Wall-normal Rotations"Trans. Japan Society of Mech. Eng.. Vol.69, No.678. 137-144 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Okamoto: "Direct Numerical and Large Eddy Simulation of Turbulent Flows Through Concentric Annuli"Engineering Turbulence Modeling and Experiments. Vol.5. 219-228 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Okamoto: "Numerical Prediction of Periodic Transpired Channel Flow with Low-Reynolds-Number Turbulence Models"Proc. 3rd Int. Symp. on Advanced Energy Conversion Systems and Related Technologies. 2B7. (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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