Anwendung einer neuen Erweiterung für k-ω-Turbulenzmodelle zur Berücksichtigung von Wandrauhigkeit auf Strömungen mit Ablösung

Abstract

The roughness extension of Knopp, Eisfeld and Calvo (2009) for k-ω type turbulence models has been applied to the flow through rough pipes, over a flat plate and around the NACA 65₂-215 airfoil with a rough surface. The results are compared to predictions using the boundary condition originally devised by Wilcox (1988) for rough surfaces, and to predictions with the Spalart-Allmaras model with the Boeing roughness extension by Aupoix and Spalart (2003). Good agreement with experiments has been achieved with respect to the influence of the roughness on the velocity profile, the skin friction coefficient and the loss in lift.