Navier-Stokes calculations for attached and separated flows using different turbulence models

ration. These flow fields, in general, could not be calculated accurately and reliably using the conventional visco~s/il1viscid Co'JPling methods [4i Turbulence models currently used in thin-layer Navier-Stokes codes are evaluated and applied to analyze three wing-body configurations. The areas of evaluation are focussed on the applicability of the models for attached and separated flow simulations, and the sensitivity of the models to the variations in grid distributions. Computational results are compared with wind tunnel surface pressure data and wind tunnel boundary layer velocity profiles. Preliminary results indicate that the non-equilibrium model of Johnson and King evaluated in the study include consistently gives good test/theory correlation O n wing the Baldwin-Lomax algebraic model 151, the original and pressures for both attached and separated flows. Chordimproved johnson.King non.equilibrium model [ G , 71 wise grid resolution near the wing trailing edge is found and the newly developed Baldwin-Barth one-equation to have a large impact on the Predicted Presmodel [SI. The Navier-Stokes solver chosen for the sure distributions for a highly aft-loaded supercritical present study is NASA ~ ~ ~ ~ l ~ ~ ' ~ thin-layer ~ ~ i ~ ~ . wing design. In addition, modifications of eddy viscosStokes code T L N S ~ D [I], ity Computations are discussed that improve numerical stability for grids with dense normal grid spacing a t the wing surface. Although highly efficient Navier-Stokes algorithms have been developed in the past few years, problems , in the areas of turbulence models, grid generation, and solution adaptation still remain to he explored and resolved. This paper concentrates on the evaluation and application of turbulence models for both attached and separated flow simulations. w