arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.09203math.NAcs.NA
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Maxwell方程的自适应有限元DtN方法

An Adaptive Finite Element DtN Method for Maxwell's Equations

Gang Bao, Mingming Zhang, Xue Jiang, Peijun Li, Xiaokai Yuan

摘要:

本文研究了三维有界不可穿透障碍物对时谐电磁波散射的数值解。电磁波的传播是由麦克斯韦方程组的边值问题在障碍物的外部区域建模。基于由无穷级数定义的Dirichlet-to-Neumann(DtN)算子,引入了一个精确的透明边界条件,将散射问题等价地化为有界区域.提出了一种基于后验误差估计的自适应有限元DtN方法,用于求解离散变分问题,其中DtN算子被截断为多项之和。后验误差估计考虑了DtN算子的有限元逼近误差和截断误差。后者示出相对于截断参数呈指数衰减。数值实验验证了该方法的有效性。

英文摘要:

This paper is concerned with a numerical solution to the scattering of a time-harmonic electromagnetic wave by a bounded and impenetrable obstacle in three dimensions. The electromagnetic wave propagation is modeled by a boundary value problem of Maxwell's equations in the exterior domain of the obstacle. Based on the Dirichlet-to-Neumann (DtN) operator, which is defined by an infinite series, an exact transparent boundary condition is introduced and the scattering problem is reduced equivalently into a bounded domain. An a posteriori error estimate based adaptive finite element DtN method is developed to solve the discrete variational problem, where the DtN operator is truncated into a sum of finitely many terms. The a posteriori error estimate takes into account both the finite element approximation error and the truncation error of the DtN operator. The latter is shown to decay exponentially with respect to the truncation parameter. Numerical experiments are presented to illustrate the effectiveness of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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