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arXiv 1707.04524math.NAcs.NA
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一种局部目标特定的展开法用于三维层势的评估

A local target specific quadrature by expansion method for evaluation of layer potentials in 3D

New Jersey Institute of Technology(新泽西理工学院);KTH Mathematics, Linné Flow Centre/Swedish e-Science Research Center(皇家理工学院数学系、林奈流体力学中心/瑞典电子科学研究中心)

Michael Siegel, Anna-Karin Tornberg

AI总结:

本文提出一种局部目标特定的展开法,用于高精度计算三维层势,通过局部展开减少计算误差,并在多连通域上验证了该方法的有效性。

摘要:

准确评估层势对于使用边界积分方程方法求解偏微分方程至关重要。展开法(QBX)是一种 recently introduced 方法,能够通过截断展开提供高精度的奇异和近奇异积分计算,利用截断展开局部表示势。QBX方法通常基于球谐展开,当截断到阶数p时有O(p²)项。这种展开可以等效地用p项表示,但付出的代价是展开系数将依赖于评估/目标点。基于这一观察,我们开发了一种目标特定的QBX方法,并将其应用于拉普拉斯方程在多连通域上的计算。该方法是局部的,因为QBX展开仅涉及目标点邻域的信息。给出了QBX展开截断误差的分析,讨论了实用的参数选择,并在各种问题上验证和测试了该方法。

英文摘要:

Accurate evaluation of layer potentials is crucial when boundary integral equation methods are used to solve partial differential equations. Quadrature by expansion (QBX) is a recently introduced method that can offer high accuracy for singular and nearly singular integrals, using truncated expansions to locally represent the potential. The QBX method is typically based on a spherical harmonics expansion which when truncated at order $p$ has $O(p^2)$ terms. This expansion can equivalently be written with $p$ terms, however paying the price that the expansion coefficients will depend on the evaluation/target point. Based on this observation, we develop a target specific QBX method, and apply it to Laplace's equation on multiply connected domains. The method is local in that the QBX expansions only involve information from a neighborhood of the target point. An analysis of the truncation error in the QBX expansions is presented, practical parameter choices are discussed and the method is validated and tested on various problems.

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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