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arXiv 2602.09055math.NAcs.NA
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一种用于周期结构声-弹性相互作用的自适应完美匹配层有限元方法

An adaptive perfectly matched layer finite element method for acoustic-elastic interaction in periodic structures

School of Mathematics, Jilin University(吉林大学数学学院);Institute of Computational Mathematics and Scientific/Engineering Computing(计算数学与科学工程计算研究所)

Sijia Li, Lei Lin, Junliang Lv

AI总结:

本文提出了一种自适应PML有限元方法,用于解决周期结构中声波与弹性体的相互作用问题,通过构建等效透明边界条件和残差型误差估计,实现了问题的高效求解。

摘要:

本文考虑了弹性体上无限周期表面处时间调和声波的散射问题。原始问题可以通过分析一个周期单元内的场来研究。借助完美匹配层(PML)技术,我们可以将无限物理域截断为有限计算域。通过分别构建声波和弹性波的等效透明边界条件,建立了所关联截断PML问题的良定性和指数收敛性。将有限元方法应用于求解声-弹性相互作用的PML问题。为了解决弹性体非光滑表面引起的奇异性,我们建立了残差型后验误差估计,并开发了自适应PML有限元算法。几个数值例子被提出以展示所提出自适应算法的有效性。

英文摘要:

This paper considers the scattering of a time-harmonic acoustic plane wave by an elastic body with an unbounded periodic surface. The original problem can be confined to the analysis of the fields in one periodic cell. With the help of the perfectly matched layer (PML) technique, we can truncate the unbounded physical domain into a bounded computational domain. By respectively constructing the equivalent transparent boundary conditions of acoustic and elastic waves simultaneously, the well-posedness and exponential convergence of the solution to the associated truncated PML problem are established. The finite element method is applied to solve the PML problem of acoustic-elastic interaction. To address the singularity caused by the non-smooth surface of the elastic body, we establish a residual-type a posteriori error estimate and develop an adaptive PML finite element algorithm. Several numerical examples are presented to demonstrate the effectiveness of the proposed adaptive algorithm.

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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