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Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

A DYNAMIC SUBGRID SCALE MODEL OF EDDY VISCOSITY TYPE DEDUCED FROM A LOCAL INTER-SCALE EQUILIBRIUM ASSUMPTION OF ENERGY TRANSFER

pages 425-430
DOI: 10.1615/TSFP3.720
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摘要

A new dynamic subgrid scale (SGS) stress model of the eddy viscosity type is proposed. This dynamic model depends on the assumption of energy transfer, i.e. the local inter-scale equilibrium, instead of the Germano identity on which traditional dynamic models depend. The choice of the energy transfer theory as the resolution principle for the dynamic procedure is natural because the main purpose of eddy viscosity models is to simulate the energy transfer between the grid scale and subgrid scale accurately. One of the advantages of the new model is no necessity for an ad hoc averaging treatment over a statistically homogeneous region, which has limited the application of dynamic models only to simple geometries. The validity of the proposed model is shown in the analysis of the plane channel flow.

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