Extension of the k-omega-SST turbulence model for flows over rough surfaces

Abstract

This paper introduces an improved computational method for predicting the behaviour of turbulent flows over rough surfaces. The method is based on the numerical solution of the Navier-Stokes equations employing the k - w-SST turbulence model. An existing surface-roughness method, developed for the traditional k — w models, was found to not work well with the SST-model. In this work, the SST-model is suitably modified and extended through the incorporation of the surface-roughness method into it. The theoretical background is briefly discussed and computational results for flat plate and an aerofoil section obtained by the new method are presented.