arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0712.1699math.NAcs.NAmath-phmath.MP
收藏

边界元方法中近奇异和近超奇异积分的数值求积

Numerical quadratures for near-singular and near-hypersingular integrals in boundary element methods

University of Bath(巴斯大学)

Michael Carley

AI总结:

提出一种无需显式分析奇异性或分解被积函数即可生成高斯型求积规则的方法,用于计算包含近奇异和近超奇异核的积分。

摘要:

本文发展了一种推导求积规则的方法,该方法能够给出高斯型规则的节点和权重,用于积分如下形式的函数:f(x,y,t) = a(x,y,t)/((x-t)^2+y^2) + b(x,y,t)/([(x-t)^2+y^2]^{1/2}) + c(x,y,t)\log[(x-t)^2+y^2]^{1/2} + d(x,y,t),而无需显式分析f(x,y,t)的奇异性或将其分解为各个分量。该方法扩展了先前关于在y≡0情况下评估柯西主值或哈达玛有限部分积分的类似技术。通过评估标准参考积分对该方法进行了测试,发现在最佳情况下其误差可与机器精度相当。

英文摘要:

A method of deriving quadrature rules has been developed which gives nodes and weights for a Gaussian-type rule which integrates functions of the form: f(x,y,t) = a(x,y,t)/((x-t)^2+y^2) + b(x,y,t)/([(x-t)^2+y^2]^{1/2}) + c(x,y,t)\log[(x-t)^2+y^2]^{1/2} + d(x,y,t), without having to explicitly analyze the singularities of $f(x,y,t)$ or separate it into its components. The method extends previous work on a similar technique for the evaluation of Cauchy principal value or Hadamard finite part integrals, in the case when $y\equiv0$. The method is tested by evaluating standard reference integrals and its error is found to be comparable to machine precision in the best case.

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。

↑