Navier-Stokes solutions are obtained for unsteady multi-passage cascade flows with Baldwin-Lomax, Baldwin-Barth, Spalart-Allmaras and k-w turbulence models. The full multi-passage flow domain with periodic boundaries is discretized with overset grids. Computations are carried out in parallel using Parallel Virtual Machine (PVM) library routines. The performance of the turbulence models is assessed for three different cases, a single element airfoil, a compressor cascade (MTU) and a turbine cascade (STC4). Comparisons of different flow variables and turbulence quantities are carried out. It is concluded that the turbulence models do not affect steady and unsteady cascade flows significantly for the flow cases studied.
 

Keywords: Turbulence Modelling, Cascade Flow, Overset Grids, Eddy viscosity, Parallel Processing, PVM, Plunge, Reynolds-Averaged Navier Stokes Equations, Finite Difference Method.