A non-conformal FETI-like domain decomposition approach of FE-BI-MLFMA for 3-D electromagnetic scattering/radiation problems

A non-conformal finite element tearing and interconnecting-like (FETI-like) domain decomposition approach (DDA) of the hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) is presented by integrating a series efficient techniques for computing electromagnetic scattering/radiation problems. The Robin transmission condition is employed to cement the non-conformal meshes on the interconnected surfaces between the interior and exterior regions and between sub-domains in the interior region. The FETI-like technique is applied to reduce the FE-BI matrix equation. Furthermore, a preconditioner is constructed to accelerate the convergent speed of this non-conformal FETI-like DDA. The numerical performance of the presented non-conformal FETI-like DDA-FE-BI-MLFMA is studied for scattering/radiation problems.