arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.01838math.APcs.NAmath.NA
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双层介质中弹性障碍物电磁散射的时域分析

Time domain analysis for electromagnetic scattering by an elastic obstacle in a two-layered medium

Changkun Wei, Jiaqing Yang, Bo Zhang

摘要:

本文研究了弹性体对含时电磁波的散射,弹性体浸没在由无界粗糙面分隔的双层背景介质的下半空间中。通过在人工平面上提出两个精确的透明边界条件,将无界散射问题转化为一个等价的带状区域上的初边值问题,并利用拉普拉斯变换、变分方法和能量方法证明了该问题的适定性和稳定性.然后引入一个完全匹配层(PML)来截断包含弹性体的两个有限层的相互作用问题,导致在有限条域中的PML问题。进一步证明了PML问题解的存在性、唯一性和稳定性估计。最后,我们建立指数收敛的厚度和参数的PML层通过误差估计的电磁(EtM)的原始问题和PML问题之间的容量运营商。

英文摘要:

In this paper, we consider the scattering of a time-dependent electromagnetic wave by an elastic body immersed in the lower half-space of a two-layered background medium which is separated by an unbounded rough surface. By proposing two exact transparent boundary conditions (TBCs) on the artificial planes, we reformulate the unbounded scattering problem into an equivalent initial-boundary value problem in a strip domain with the well-posedness and stability proved using the Laplace transform, variational method and energy method. A perfectly matched layer (PML) is then introduced to truncate the interaction problem with two finite layers containing the elastic body, leading to a PML problem in a finite strip domain. We further verify the existence, uniqueness and stability estimate of solution for the PML problem. Finally, we establish the exponential convergence in terms of the thickness and parameters of the PML layers via an error estimate on the electric-to-magnetic (EtM) capacity operators between the original problem and the PML problem.

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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