Abstract
A two-layer turbulence model is described which uses the standard k-e model in the bulk of the flow and resolves the viscosity-affected regions near walls with a one-equation model based on empirical length-scale prescriptions. Applications of the two-layer model to the following separated flows are presented: flow over a backward-facing step, over a T-profile, over a channel bed with periodic dunes and past an airfoil at 14° angle of attack. In all cases with larger separation regions, the two-layer model yielded a significant improvement of the predictions compared with the standard k-e model using wall functions; in particular the length of the separation region is predicted in better agreement with the experiments.
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