High-contrast approximation for penetrable wedge diffraction

High-contrast approximation for penetrable wedge diffraction
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可穿透楔形衍射的高对比度近似

DOI:
10.1093/imamat/hxaa011
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发表时间:
2020
影响因子:
1.2
通讯作者:
Abrahams I
Abrahams I
中科院分区:
数学4区
文献类型:
--
作者:
Abrahams I

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在高对比度极限下,考虑了可穿透楔形波衍射的重要开正则问题。在数学上,这意味着对比度参数,即宿主和楔形散射体的特定材料特性之比,被假设为很小。相关的材料属性取决于物理环境,对于声波和电磁波来说是不同的。基于这一假设,构造了一种新的渐近迭代格式。可穿透楔形问题的解可以用(可能是非齐次的)不可穿透楔形问题的无穷多个解来表示。每个难以理解的问题都是使用Sommerfeld-Malyuzhinets和Wiener-Hopf技术的组合来解决的。所得到的可穿透楔的近似解涉及大量嵌套的复积分,因此难以进行数值计算。为了解决这个问题,开发并实现了一种微妙的方法(结合渐近,插值和复分析),从而实现了快速有效的数值计算。该渐近格式具有优异的收敛性,并对现有的方法有了明显的改进。
The important open canonical problem of wave diffraction by a penetrable wedge is considered in the high-contrast limit. Mathematically, this means that the contrast parameter, the ratio of a specific material property of the host and the wedge scatterer, is assumed small. The relevant material property depends on the physical context and is different for acoustic and electromagnetic waves for example. Based on this assumption, a new asymptotic iterative scheme is constructed. The solution to the penetrable wedge is written in terms of infinitely many solutions to (possibly inhomogeneous) impenetrable wedge problems. Each impenetrable problem is solved using a combination of the Sommerfeld–Malyuzhinets and Wiener–Hopf techniques. The resulting approximated solution to the penetrable wedge involves a large number of nested complex integrals and is hence difficult to evaluate numerically. In order to address this issue, a subtle method (combining asymptotics, interpolation and complex analysis) is developed and implemented, leading to a fast and efficient numerical evaluation. This asymptotic scheme is shown to have excellent convergent properties and leads to a clear improvement on extant approaches.
四分之一平面衍射问题的惊人观察
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