Flow in a diffusing s-shaped intake has been examined using computational fluid dynamics simulations. This paper discusses the effects of different modelling techniques for such flows. Inviscid modelling gave a qualitatively good description of the flow for a simple low mass flow case. However it was seen that at high mass flow rates the inviscid solution is unsteady unless a modification is made to the duct geometry. Navier-Stokes calculations were performed for the same high and low mass flow

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... cases using a variety of turbulence models. Results were much more favourable for both cases. It was found that different closure techniques and convergence levels had major differences in terms of the flow features predicted.