TY - EJOU AU - Takehito, Mizuma AU - Amane, Takei TI - Eddy Current Analyses by Domain Decomposition Method Using Double-Double Precision T2 - Computer Modeling in Engineering \& Sciences PY - 2018 VL - 116 IS - 3 SN - 1526-1506 AB - A matrix equation solved in an eddy current analysis, A-ϕ method based on a domain decomposition method becomes a complex symmetric system. In general, iterative method is used as the solver. Convergence of iterative method in an interface problem is improved by increasing an accuracy of a solution of an iterative method of a subdomain problem. However, it is difficult to improve the convergence by using a small convergence criterion in the subdomain problem. Therefore, authors propose a method to introduce double-double precision into the interface problem and the subdomain problem. This proposed method improves the convergence of the interface problem. In this paper, first, we describe proposed method. Second, we confirm validity of the method by using Team Workshop Problem 7, standard model for eddy current analysis. Finally, we show effectiveness of the method from two numerical results. KW - Double-double precision KW - domain decomposition method KW - eddy current analysis KW - parallel finite element method DO - 10.31614/cmes.2018.01714