Comparison of Various Turbulence Models in Respect to Their Suitability for CFD Calculations of Diffuser Flows

This paper presents results of a study conducted to determine which linear turbulence models are the most appropriate ones to predict the behaviour of air flows in channel diffusers. Due to the fact that the studied flows could be characterised as two-dimensional, the simulations were carried out with a 2D-CFD-Code. This work includes simulations of two test cases without and with boundary layer detachment, respectively. Moreover, the flows take place in diffusers with a symmetrical or an asymmetrical geometry.