三维非均匀电大目标散射的有限元撕接区域分解法计算

针对非均匀电大目标的散射问题,将有限元撕接区域分解方法(finite element tearing and interconnecting,FETI)应用于非均匀电大目标散射的精确计算模型.该计算模型以各向异性完全匹配吸收层作为吸收边界.数值实验表明,该计算模型比一般吸收边界条件模型精度高.更为重要的是,虽然该模型由于使用各向异性完全匹配吸收层导致计算效率略有降低,但降低十分有限,有限元撕接区域分解方法对于电大尺寸目标的该模型仍然具有很高的计算效率.结果表明,有限元撕接区域分解方法是计算非均匀电大目标散射的一种有效方法.

Computation of Elecrtomagnetic Scattering by 3D Large Inhomogeneous Targets Utilizing Finite Element Tearing and Interconnecting Method

To solve electromagnetic scattering problem by 3D large inhomogeneous targets, computation of electromagnetic scattering by 3D large inhomogeneous targets continues to be a challenging task. The electromagnetic dual-primal finite element tearing and interconnecting (FETI) method is adopted in this paper. In computation model, the perfectly matched layer (PML) is used to truncate the simulation domain. Numerical experiments reveal that the PML model results in much higher accuracy over the 1st-order absorbing boundary condition model. More importantly, although the PML model gives rise to ill-conditioned discretized matrixes, FETI method could still ensure a high degree of efficiency that demonstrates great potential of FETI for analyzing electromagnetic scattering by 3D large inhomogeneous targets.