The performance of some of the most commonly used eddy viscosity turbulence models to predict separated boundary layer flows in adverse pressure gradient has been evaluated against large eddy simulations. The LES results were used to assess the consistency of the different terms in the k–ε, ζ–f, k–ω and Spalart-Allmaras models. For the separated boundary layer, the eddy-viscosity assumption works well, and anisotropic effects are not significant. However, the near-wall treatment used in k–ε models was found to have a critical effect on the predictive accuracy of the flow (and, in particular, of separation and reattachment points). None of the wall treatments tested resulted in accurate prediction of the flow field.

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