An Efficient Parallelization Approach of FEM-DDM for Large-Scale 3D Scattering Problems

We present in this paper an efficient parallelization approach of the finite element domain decomposition method (FEM-DDM) for large scale 3D scattering problems. In this parallel FEM-DDM, the domain decomposition is done in a hierarchical way to minimize the inter-processor communication. In the hierarchical domain decomposition scheme, the whole FEM solution domain is first decomposed into large size subdomains with a total number equals to MPI processes. Then, each large subdomain is distributed to a MPI process and further decomposed into smaller ones to achieve good computation efficiency. Numerical examples are presented to demonstrate the accuracy, scalability, and capability of the proposed parallel FEM-DDM algorithm.