NUMERICAL SIMULATION OF SEPARATING FLOW AROUND A BODY USING ARTIFICIAL COMPRESSIBILITY METHOD

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  • 擬似圧縮性法による物体周りの剥離流れの数値解析
  • Numerical simulation of separating flow

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An algorithm based on the artificial compressibility method is tested for the computation of separating flow around a body. A third-order upwind differencing scheme is used to compute convective terms and a fourth-order damping term is added to the pres-sure equation to avoid unphysical oscillations. The optimal parameter values are examined through a series of two-dimensional laminar flow computations over a circular cylinder. The results indicate the optimal value for the artificial compressibility parame-ter can be decided with the physical time step size. Then three dimensional flow computations around a square cylinder at the Reynolds number 22,000 are presented and the results are compared with experimental and other computational results. Though present computations are laminar, the computed results show better agreement with the experimental data.

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