The Reynolds-averaged Navier-Stokes equations are solved numerically for supersonic flow over a blunt fin mounted on a flat plate with Roe third-order flux difference splitting scheme. Turbulence eddy-viscosity is computed by Baldwin-Lomax model, Johnson-King model and Launder-Sharma k- epsilon model. The pressure distributions are in good agreement with experimental results. Some features, such as two reversed-flow supersonic zones and secondary vortex structure are predicted well. The comparative study suggests: (1) The Wilcox compressibility correction is more potent than Sarkar correction for the case. (2) Johnson-King model provides a better overall simulation, (3) The performances of three different kinds of turbulence models are essentially the same, but the computation efforts increase one by one.
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