Numerical Analysis of Turbulent Separated Subsonic Diffuser Flows

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Abstract
A general finite difference formulation of the incompressible Navier- Stokes equations in terms of the vorticity and the stream function is presented for turbulent internal flows. Turbulent models such as algebraic eddy viscosity models, and the low Reynolds number two-equation k-epsilon models were systematically studied. Numerical solutions are presented for both separated and non-separated subsonic diffuser flows with either a sublayer coordinate stretching or a low of the wall matching procedure. Excellent agreement with experimental data is obtained for the fully developed channel flow. Agreement with data from an 8-deg conical diffuser is also good. The detailed flow-field structure for separated diffuser flows can be obtained including the prediction of the separation point.

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