Abstract
This work describes a distributed-memory parallel approach for the fast generation of ultra-large-scale unstructured meshes on supercomputers. A medium size of initial coarse mesh is prepared first. Then, hierarchical domain decomposition is carried out to split the initial mesh and mesh migration is performed to distribute the mesh to each process. Finally, parallel mesh multiplication without communication is performed in each subdomain to obtain the required scale of meshes. Tests of the parallel mesh generation approach for some real-life problems on supercomputers are presented. Test results shows that the proposed parallel approach has a reasonably good parallel efficiency and the quality of the generated large-scale meshes is sustained and somewhat improved. It is also demonstrated that ultra-large-scale meshes with billions of elements can be generated fast with the proposed parallel approach.
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