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arXiv 1902.09935math.NAcs.NA
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高对比度非均匀介质高频散射计算

Computational high frequency scattering from high contrast heterogeneous media

Daniel Peterseim, Barbara Verfürth

摘要:

本文考虑了计算(声)波在强非均匀结构中的传播,超越了周期性的假设。微结构多相材料的成分之间的高对比度可以导致不寻常的波散射和吸收,这从物理观点来看是有趣的和相关的,例如,在具有缺陷的晶体的情况下。我们提出了一种计算多尺度方法的精神,局部正交分解,并提供严格的先验误差分析的两相扩散系数之间的变化$1$和非常小的值。特别注意的是高频率,高对比度的极端制度,以及他们以前未探索的共存。一系列的数值实验证实了理论结果,并表明多尺度方法有效地捕捉相关的物理现象的能力。

英文摘要:

This article considers the computational (acoustic) wave propagation in strongly heterogeneous structures beyond the assumption of periodicity. A high contrast between the constituents of microstructured multiphase materials can lead to unusual wave scattering and absorption, which are interesting and relevant from a physical viewpoint, for instance, in the case of crystals with defects. We present a computational multiscale method in the spirit of the Localized Orthogonal Decomposition and provide its rigorous a priori error analysis for two-phase diffusion coefficients that vary between $1$ and very small values. Special attention is paid to the extreme regimes of high frequency, high contrast, and their previously unexplored coexistence. A series of numerical experiments confirms the theoretical results and demonstrates the ability of the multiscale approach to efficiently capture relevant physical phenomena.

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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