NonInvasive Multigrid For SemiStructured Grids

Multigrid solvers for semistructured meshes are developed. Such provide flexibility to address complex computational domains while still allowing most multigrid calculations be accomplished using efficient structured grid ideas and kernels. The considered center around the concept of block grids, i.e., a union fully mesh blocks, or region where some blocks allowed unstructured enhance meshing flexibility. In both cases, conform at interfaces. Overall, we aim develop framework grids that can easily adopted by application codes without invasive changes existing code base. particular, target have been developed optimized meshes. To this end, paper first proposes formal mathematical describing solver. Then, formalism allows us precisely define associated method show its relationship more traditional Additionally, clarifies software design implementation. Numerical experiments highlight new solver with classical multigrid. We also demonstrate generality potential performance gains type as well showcase hypersonic flow problems structured/unstructured