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A Self-Adapting Turbulence Model for Hybrid RANS/LES

A two-equation transport model is used to model turbulence at any mesh resolution, from RANS to LES, to DNS. The two-equation model used is a slight variation of the standard / k e model that allows the backscatter of energy to the resolved scales. The model automatically adapts to the mesh resolution provided and no user interaction is necessary. This model is tested against moderately high Reynolds number isotropic decaying turbulence and gives very good predictions at any mesh resolution. A detailed analysis shows that at LES resolutions the solution remains fully unsteady and three-dimensional and the solution does not approach a RANS like solution. At DNS resolutions, it is shown that the model automatically becomes negligible.