An Automatic Joining Mesh Approach for Computational Fluid Dynamics to Reach a Billion Cell Simulations

摘要

Computational Fluid Dynamics simulations have benefited significantly from recent improvements in computational performance. Complex configurations with larger unstructured meshes of the size of several billion grid cells are now achievable. However, as most mesh generation tools still run only in serial, this limits the size of the meshes that may be used with CFD solvers. An approach based on a octree search algorithm facilitates the joining of mesh parts. It has been implemented in CodeSaturne, and has been used here to join contiguous parts of a mesh. A demonstration test case joining 16 meshes of a submarine with 122 million grid cells each has been successfully run with CodeSaturne on 3,072 processors of HECToR, the UK high-end Cray XT6 machine.