Nonconforming domain decomposition method as a preconditoner for the solution of large EM problems

In this paper, with the primary field variable is the electric field, a similar condition for the interface tangential electric field is derived. A Krylov method without a good preconditioner is usually slow. Nonconforming domain decomposition method (NDDM) is naturally a very good preconditioner since it inverts domain matrices. The Gauss-Seidel method is applied to speed up the iterative convergence. Also if the domains are ordered by a wavefront method, i.e., start from the source domain and proceed with the direction of propagation to the other domains, the rate of convergence will be further improved.