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A dynamic subgrid-scale model for the large eddy simulation of stratified flow. (English) Zbl 0980.76035

Summary: A new dynamic subgrid-scale (SGS) model, including subgrid turbulent stress and heat flux models for stratified shear flow, is proposed by using Yoshizawa eddy viscosity model as a base model. Based on our calculated results, the dynamic subgrid-scale model developed here is effective for large eddy simulation of stratified turbulent channel flows. The new SGS model is then applied to large eddy simulation of stratified turbulent channel flow under gravity to investigate the coupled shear and buoyancy effects on near-wall turbulent statistics and turbulent heat transfer at different Richardson numbers. The critical Richardson number predicted by the present calculation is in good agreement with the theoretical value.

MSC:

76F65 Direct numerical and large eddy simulation of turbulence
76F25 Turbulent transport, mixing
76F10 Shear flows and turbulence
80A20 Heat and mass transfer, heat flow (MSC2010)
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