Краткое описание

A coherent structure model (CSM) as a subgrid scale (SGS) model is applied to the flows in complex geometries. The simulations of flow over a backward-facing step and flow in an asymmetric plane diffuser are examined. The CSM yields a level of accuracy similar to that obtained by using the dynamic Smagorinsky model (DSM) (Germano et al. 1991). Compared to the DSM, the newly proposed CSM has advantages of local determination of the SGS model parameter and of faster computation. Since the model parameter of the CSM has a positive, finite small variance, it is stable in spite of local determination of the model parameter. This model is suitable for engineering applications with complex geometries.