Abstract
A hybrid RANS/LES model based on renormalization group (RG) calculations is presented. The result of the RG approach is a one-equation LES subgrid model in well-resolved regions of the flow, and a two-equation RANS model otherwise. The two modes of the model are linked by comparing the filter width with a length scale constructed from subgrid quantities. The one-equation subgrid model uses a transport equation for the mean rate of dissipation, in which the inverse time scale is explicitly filter width dependent. The model is free of adjustable parameters (after the truncations of the approximate RG are made) in its high-Reynolds formulation, has a clear physical interpretation and is easy to implement.
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