In connection with the design of a low speed wind tunnel in Northwestern Polytechnical University, numerical investigation of the flow in rectangular contraction has been conducted. Finite difference method is employed, using body-fitted coordinates and AF1 scheme, and solved by ADI technique. The flows in three commonly used contour curves are analyzed, i. e. Witozinsky curve, fifth power curve and matched cubic curves. Three-dimensional features of the contraction flow are demonstrated in the calculation....
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