An Overset Grid Solver for Viscous Computations with Multigrid and Parallel Computing

We describe an approach to simulate accurately viscous flows around complex configurations using overset grids. A combination of patched multi-block and overlapping grids is used to discretize the flow domain. A hierarchical grid system with different layers of grids of varying resolution ensures inter-grid connectivity within a multigrid solution acceleration framework. At each stage of the numerical computation, the block boundaries maintain a regular information exchange between neighboring blocks be it patched or overlapping boundaries. Coarse-grain parallel processing is facilitated by the multi-blocking system. Numerical results of flows over multi-element airfoils and three-dimensional turbulent flows around wingbody aerodynamic configurations show the feasibility and efficiency of the method for large-scale numerical computations.

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