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A computational method for 3D incompressible flows is developed on the unstructured collocated-grid system. In the prediction procedure of the MAC algorithm, the CBP (CellBoundary Pressure) scheme is utilized to obtain the estimated velocity components at cellcenter points. In order to preserve the fluid mass with sufficient accuracy, a C-HSMAC method, whose validity has been shown in the structured collocated grid system, is implemented in the present method. In addition, the proposed method is parallelized on the basis of a domain decomposition method by setting up the overlapping tetrahedron cells. The advantage of the C-HSMAC method and the availability of the parallel computation are investigated through the computation of a cavity flow. The applicability to 3D flows in a curved duct is also discussed.

Parallel Computational Method for Incompressible Flows with C-HSMAC Method on 3D Unstructured Collocated-Grid System