A single layer representation of the scattered field for multiple scattering problems

IF 2.1 3区 物理与天体物理 Q2 ACOUSTICS
Didier Felbacq, Anthony Gourdin, Emmanuel Rousseau
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引用次数: 0

Abstract

The scattering of scalar waves by a set of scatterers is considered. It is proven that the scattered field can be represented as an integral supported by any smooth surface enclosing the scatterers. This is a generalization of the series expansion over spherical harmonics and spherical Bessel functions for spherical geometries. More precisely, given a set of scatterers, the field scattered by any subset can be expressed as an integral over any smooth surface enclosing the given subset alone. It is then possible to solve the multiple scattering problem by using this integral representation instead of an expansion over spherical harmonics. This result is used to develop an extension of the Fast Multipole Method in order to deal with subsets that are not enclosed within non-intersecting balls.
多散射问题的散射场单层表示法
研究了一组散射体对标量波的散射。研究证明,散射场可以表示为由包围散射体的任何光滑表面支持的积分。这是对球形几何的球面谐波和球面贝塞尔函数的级数展开的概括。更准确地说,在给定一组散射体的情况下,任何子集散射的场都可以表示为对包围给定子集的任何光滑表面的积分。这样就可以通过使用这种积分表示法而不是球面谐波展开来解决多重散射问题。这一结果被用于开发快速多极子方法的扩展,以处理不包含在非相交球内的子集。
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来源期刊
Wave Motion
Wave Motion 物理-力学
CiteScore
4.10
自引率
8.30%
发文量
118
审稿时长
3 months
期刊介绍: Wave Motion is devoted to the cross fertilization of ideas, and to stimulating interaction between workers in various research areas in which wave propagation phenomena play a dominant role. The description and analysis of wave propagation phenomena provides a unifying thread connecting diverse areas of engineering and the physical sciences such as acoustics, optics, geophysics, seismology, electromagnetic theory, solid and fluid mechanics. The journal publishes papers on analytical, numerical and experimental methods. Papers that address fundamentally new topics in wave phenomena or develop wave propagation methods for solving direct and inverse problems are of interest to the journal.
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