arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.00372math.NAcs.NA
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参数相关层势的自适应核分裂quadrature方法

An adaptive kernel-split quadrature method for parameter-dependent layer potentials

Fredrik Fryklund, Ludvig af Klinteberg, Anna-Karin Tornberg

摘要:

基于面板的核分裂求积是目前最有效的方法之一,可用于精确评估奇异和近奇异层潜力在二维。但对于修正的Helmholtz方程、修正的双调和方程和修正的斯托克斯方程的层势,它可能完全失效。这些方程取决于一个参数,表示为$α$,当这个参数增长超过某个阈值时,核分裂正交快速失去其精度。本文介绍了一种算法,解决这个问题,使用每目标自适应采样的源几何形状。细化是通过递归二分法,精心挑选的规则集。这以作为$\log α$缩放的增加的成本来维持参数$α$的宽范围的准确性。使用这种算法允许核分裂正交是准确和有效的更广泛的问题比以前可能的。

英文摘要:

Panel-based, kernel-split quadrature is currently one of the most efficient methods available for accurate evaluation of singular and nearly singular layer potentials in two dimensions. However, it can fail completely for the layer potentials belonging to the modified Helmholtz, modified biharmonic and modified Stokes equations. These equations depend on a parameter, denoted $α$, and kernel-split quadrature loses its accuracy rapidly when this parameter grows beyond a certain threshold. This paper describes an algorithm that remedies this problem, using per-target adaptive sampling of the source geometry. The refinement is carried out through recursive bisection, with a carefully selected rule set. This maintains accuracy for a wide range of the parameter $α$, at an increased cost that scales as $\log α$. Using this algorithm allows kernel-split quadrature to be both accurate and efficient for a much wider range of problems than previously possible.

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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