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A computer program has been developed to predict three-dimensional compressible viscous flows in ducts with arbitrary cross-sectional shapes. A curvilinear boundary-fitted coordinate system is used to simplify boundary conditions. The parabolized Navier-Stokes equations are transformed, and the solution is marched down the duct using an iterative ADI procedure. Computed results are compared with test data for laminar test cases in square and round ducts. A two-equation turbulence model is demonstrated for a developing turbulent pipe flow. A comparison between predicted results and test data is presented for a turbulent diffuser flow with a rectanguiar-to-round transition in cross-sectional geometry.

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