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APPLYING DYNAMIC PROCEDURE FOR THE ENERGY PRODUCTION IN ONE-EQUATION SUBGRID SCALE MODEL OF LES

Takeo Kajishima
Department of Mechanical Engineering, Osaka University, 2-1 Yamada-oka, Suita-city, Osaka 565-0871 Japan

Takayuki Nomachi
Department of Mechanical Engineering, Osaka University Yamadaoka, Suita, Osaka 565-0871, Japan

Sinopsis

In order to develop a universal subgrid scale model for large-eddy simulation (LES), we take note of one-equation model for subgrid scale (SGS) kinetic energy, KSGs. A dynamic procedure is used to the production term in the transport equation of SGS kinetic energy, while the eddy viscosity in the filtered equation of motion is determined indirectly through KSGs. The statistically derived model for KSGs equation is adopted for the basis of our improvement. First, our model was applied to a fully developed turbulent flow in a plane channel and agreement with DNS database was satisfactory. In addition, the influence of solid body rotation on a channel flow was compared. Our model, resolving a defect of conventional eddy viscosity models, reasonably reproduced the decay of SGS turbulence in the vicinity of the suction side.