Investigation of nonlinear eddy-viscosity turbulence models in shock/boundary-layer interaction

Validation of nonlinear two- and three-equation, eddy-viscosity turbulence models (NLEVM) in transonic flows featuring shock/boundary-layer interactio n and separation Is presented. The accuracy of the models is assessed again st experimental results for two transonic flows over bump geometries. Moreo ver, the accuracy and efficiency of NLEVMs is also assessed in contrast to numerical predictions obtained by a variety of other models employed in thi s study. These include two linear eddy-viscosity k-epsilon models, the k-om ega shear-stress transport model, and a nonlinear version of the k-omega mo del. Discretization of the mean Row and turbulence transport equations is o btained by a characteristics-based scheme (Riemann solver) in conjunction w ith an implicit unfactored method. The study shows that NLEVMs improve the numerical predictions in shock/boundary-layer interaction, compared to the linear models, but they require longer computing times.