arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1801.04070math.NAcs.NA
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Quadrature的一种带误差界的快速算法

A Fast Algorithm with Error Bounds for Quadrature by Expansion

Matt Wala, Andreas Klöckner

摘要:

展开求积法(QBX)是一种求积方法,用于近似计算层势中遇到的奇异积分值。它利用层势的光滑性,通过形成局部有效的展开,然后计算积分的近表面值。最近将快速多极子方法(FMM)与QBX结合的工作,为快速评估此类积分(以及相关积分方程的解)迈出了第一步,尽管仅凭经验理解错误行为。在本文中,我们改进了这种方法与修改后的算法,我们给出了一个全面的误差和成本的情况下,拉普拉斯方程的二维分析。对于相同级别的(用户指定的)准确性,新算法经验上具有与先前方法相当的每准确性成本。我们提供实验结果来证明可扩展性和数值精度。

英文摘要:

Quadrature by Expansion (QBX) is a quadrature method for approximating the value of the singular integrals encountered in the evaluation of layer potentials. It exploits the smoothness of the layer potential by forming locally-valid expansion which are then evaluated to compute the near or on-surface value of the integral. Recent work towards coupling of a Fast Multipole Method (FMM) to QBX yielded a first step towards the rapid evaluation of such integrals (and the solution of related integral equations), albeit with only empirically understood error behavior. In this paper, we improve upon this approach with a modified algorithm for which we give a comprehensive analysis of error and cost in the case of the Laplace equation in two dimensions. For the same levels of (user-specified) accuracy, the new algorithm empirically has cost-per-accuracy comparable to prior approaches. We provide experimental results to demonstrate scalability and numerical accuracy.

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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