3-D time-harmonic eddy current problems solved by the geometric multigrid preconditioned conjugate gradient Method

The focus of this paper is on the efficient solution of 3-D time-harmonic eddy current problems discretized by the finite element method with bad quality meshes. The systems of equations arising from the finite element formulations are solved by a geometric multigrid preconditioned conjugate gradient method. The efficiency of the proposed method will be analyzed by numerical examples.