ACCURACY AND EFFICIENCY OF FLOW COMPUTATIONS WITH TURBULENCE MODELS OF k- TYPE

The accuracy and efficiency of flow computations with two-equation statistical turbulence models of ktype, which are widely used in engineering practice, is investigated. With respect to wall boundary treatment special emphasis is paid to lowReynolds-number approaches directly resolving viscous sublayers. The standard wall functions approach is considered for comparison. As a basic flow solver a parallel multi-grid finite-volume method of second order with implicit time discretization is employed, which for laminar has cases turned out to work rather efficiently with respect to accuracy and computational performance. The investigations involve statistically steady and unsteady flow situations. By considering representative test cases various aspects of the components of the numerical scheme determining the accuracy and efficiency of the computations are studied.