Abstract
The influence of various turbulence models and transition models in calculations involving unsteady separated flows is tested in the chapter. The results are compared against experimental data and other published calculations. For very sensitive flow problems, different turbulence models produce different results, which also depend on the details of the implementation of a particular turbulence model, even if the same Navier-Stokes solver scheme is used. An evaluation of the ability of different turbulence and transition models to predict unsteady flow in dynamic stall and shock buffet cases is conducted. None of the models considered is capable to fully accurately predict the dynamic stall cases. The buffet case resulted in good agreement with the experiments; however, the configuration used is somehow “easier” than a normal supercritical airfoil. The Spalart-Allmaras model has consistently proved to be the best among those considered for these kinds of applications.
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