A fast algorithm with error bounds for Quadrature by Expansion
A fast algorithm with error bounds for Quadrature by Expansion
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一种具有误差范围的展开求积的快速算法
DOI:
10.1016/j.jcp.2018.05.006
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发表时间:
2018
影响因子:
4.1
通讯作者:
Klöckner, Andreas
中科院分区:
文献类型:
--
作者:
Wala, Matt;Klöckner, Andreas
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 expansions which are then evaluated to compute the near or on-surface value of the potential. 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.
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DOI:
10.1016/j.jcp.2017.04.062
发表时间:
2016
期刊:
J. Comput. Phys.
影响因子:
--
作者:
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通讯作者:
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影响因子:
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作者:
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DOI:
10.1137/140962681
发表时间:
2015
期刊:
SIAM J. Sci. Comput.
影响因子:
--
作者:
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