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arXiv 1607.00769math.NAcs.NA
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具有阻抗边界条件的二维Lipschitz域中亥姆霍兹问题的well-conditioned边界积分方程 formulations 及Nyström离散化

Well-conditioned boundary integral equation formulations and Nyström discretizations for the solution of Helmholtz problems with impedance boundary conditions in two-dimensional Lipschitz domains

New Jersey Institute of Technology(新泽西理工学院)

Catalin Turc, Yassine Boubendir, Mohamed Kamel Riahi

AI总结:

本文提出一种正则化策略,用于求解具有阻抗边界条件的二维Lipschitz域中亥姆霍兹问题的well-conditioned边界积分方程,并通过graded-mesh Nyström离散化实现高效准确的求解。

摘要:

我们提出了一种正则化策略,用于得到具有阻抗边界条件的二维Lipschitz域中亥姆霍兹方程的well-conditioned边界积分方程 formulations。我们考虑了经典阻抗边界条件以及传输阻抗条件,其中阻抗是某些 coercive 操作符。后者类型的问题对于加速亥姆霍兹问题的域分解方法收敛速度至关重要。我们的正则化 formulations 将解的Dirichlet迹作为未知量。利用我们 formulations 中未知量的更高正则性,我们通过各种数值结果表明,基于graded-mesh的Nyström离散化这些正则化 formulations 可以高效且准确地求解内部和外部亥姆霍兹问题的阻抗边界条件。

英文摘要:

We present a regularization strategy that leads to well-conditioned boundary integral equation formulations of Helmholtz equations with impedance boundary conditions in two-dimensional Lipschitz domains. We consider both the case of classical impedance boundary conditions, as well as the case of transmission impedance conditions wherein the impedances are certain coercive operators. The latter type of problems is instrumental in the speed up of the convergence of Domain Decomposition Methods for Helmholtz problems. Our regularized formulations use as unknowns the Dirichlet traces of the solution on the boundary of the domain. Taking advantage of the increased regularity of the unknowns in our formulations, we show through a variety of numerical results that a graded-mesh based Nyström discretization of these regularized formulations leads to efficient and accurate solutions of interior and exterior Helmholtz problems with impedance boundary conditions.

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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