Modified wave-front method in 3D electromagnetic field analysis

Currently there are two main numerical schemes to solve large and sparse finite element matrix equations, one is the direct approach like the Gauss-style method, the other one is the iteration approach. The wave-front method is a kind of special Gauss method. Though the front method is famous for its efficient computation characteristics, it can only be utilized to solve regular finite element matrix equations, i.e, not changeable-degree node problems such as mechanical finite element analysis and is seldom employed in low-frequency EM analysis using FEM because of the change-degree node problem. In this paper, the modified wave-front approach is presented for changeable-degree node problems from 3D eddy current computation, and good agreement between numerical and experimental results are obtained.