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arXiv 1211.2467physics.comp-phcs.NAmath.NA
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一种应用于带角圆柱散射问题的精确边界值问题求解器

An accurate boundary value problem solver applied to scattering from cylinders with corners

Lund University(隆德大学);Centre for Mathematical Sciences(数学科学中心);Electrical and Information Technology(电气与信息技术)

Johan Helsing, Anders Karlsson

AI总结:

本文采用递归压缩逆预处理(RCIP)方法处理积分方程中的角点奇异性,实现了对分段光滑边界完美导电圆柱散射问题的高精度求解,在kd=1000时仍能获得至少13位有效数字的精度。

摘要:

本文考虑了波在具有分段光滑边界的完美导电圆柱上的经典散射问题。散射问题被表述为积分方程,并使用Nyström方案求解,其中圆柱的角点通过一种称为递归压缩逆预处理(RCIP)的方法高效处理。该方法在处理非光滑域中的静态问题方面非常成功,本文表明它同样适用于亥姆霍兹方程。在数值示例中,我们专门研究了E波和H波从一个带角圆柱的散射。即使在尺寸kd=1000(其中k是波数,d是直径)时,该方案在圆柱外部的电场和磁场中仍能产生至少13位有效数字的精度。

英文摘要:

In this paper we consider the classic problems of scattering of waves from perfectly conducting cylinders with piecewise smooth boundaries. The scattering problems are formulated as integral equations and solved using a Nyström scheme where the corners of the cylinders are efficiently handled by a method referred to as Recursively Compressed Inverse Preconditioning (RCIP). This method has been very successful in treating static problems in non-smooth domains and the present paper shows that it works equally well for the Helmholtz equation. In the numerical examples we specialize to scattering of E- and H-waves from a cylinder with one corner. Even at a size kd=1000, where k is the wavenumber and d the diameter, the scheme produces at least 13 digits of accuracy in the electric and magnetic fields everywhere outside the cylinder.

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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