Краткое описание

In previous works the SGS models assessment was mainly performed through comparisons with Direct Numerical Simulation (DNS) results limited to low Reynolds numbers. Based on a comprehensive, highly resolved experimental database of scalar field and SGS quantities, an assessment of SGS scalar flux models is carried out at both resolved and sub-grid scale levels for configurations characterized by high Reynolds numbers for which DNS-data are not available. For this purpose, a free jet configuration is used. Different SGS scalar flux models are evaluated along with a new developed dynamic anisotropy model which combines the conventional linear eddy diffusivity model with an additional term coupling the (deviatoric) SGS stress tensor and the gradient of the filtered scalar field. The new SGS scalar flux model achieves an overall good agreement with experimental data at both levels.