階層型領域分割法による電磁界解析での四倍精度演算QMR法，QMR_SYM法

抄録

This paper deals with a parallel finite element analysis by Hierarchical Domain Decomposition Method (HDDM) of an electromagnetic field problem with a quadruple precision floating point number. A Quasi-Minimal Residual (QMR) method for real symmetric matrices and a QMR_SYM method for complex symmetric matrices are implemented in the quadruple precision for the parallel computing. Then, the HDDM with the quadruple precision arithmetic for the electromagnetic field problem is implemented by the C language. As a result, the convergence of the iterative method is improved, and the minimum residual norm is reduced by approximately five orders of magnitude in a high-frequency electromagnetic field analysis.