COMPARISON OF THE PREDICTIVE CAPABILITIES OF SEVERAL TURBULENCE MODELS

Four turbulence models are evaluated for transonic separated flows usi ng two well-established solvers, one upwind and one central difference . The equilibrium model of Baldwin-Lomax predicts separated-now shock locations too far aft, The effects of several modifications to the hal f-equation model of Johnson-King are explored in detail, and different versions of the model are compared. Good results for two- and three-d imensional flows can be obtained using two different versions of this model. The one-equation models of Baldwin-Barth and Spalart-Allmaras p erform well for airfoil flows, but can predict the shock too far forwa rd at the outboard stations of a separated wing. The effects of numeri cal truncation error are assessed using grid-refinement studies in com bination with varying the numerical dissipation levels in both codes.