PREDICTION OF COMPLEX FLOW-FIELDS USING HIGHER-ORDER TURBULENT CLOSURES

The tool of choice in computing turbulent flows of engineering interes t is the Reynolds averaged Navier-Stokes equations for the mean motion , coupled with a closure scheme for the unknown higher-order turbulent correlations. The focus of this paper is to discuss some recent advan ces in turbulent closure schemes and their application to a weakly com pressible flow. Specifically highlighted are the development and utili zation of formulations for obtaining explicit algebraic stress and dis sipation rate models. Results are presented for the flow over a two-di mensional single element airfoil as well as the downstream wake flow u sing the explicit algebraic stress model with a comparison to both exp eriment and a standard isotropic eddy viscosity model.