Development of Fast Unstructured Cfd Code “fastar”
نویسندگان
چکیده
In order to develop a fast CFD code, we investigated well-known unstructured CFD codes, and we have determined the target performance and specification of CFD code. This is then followed by the development of a fast unstructured CFD code “FaSTAR”. The accuracy of drag prediction with FaSTAR is validated by the DPW4 benchmark problem. The computed drag coefficients generally agree with other results. Since we employ the Cartesian-based unstructured grid generated with HexaGrid, the predicted drag is affected by the choice of discretization method, whether it is cell-center or cell-vertex. The computational speed of present CFD code is 1.8 hour/case with 10 million grid and 100 cores for a standard civil aircraft. Although we have not achieved the requirement of 1hour/case, we believe that it is possible to achieve the target using the multigrid. The preliminary multigrid result shows four times faster convergence with global coarse grid.
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