Computational high frequency scattering from high contrast heterogeneous media
Abstract
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.
- Publication:
-
arXiv e-prints
- Pub Date:
- February 2019
- DOI:
- 10.48550/arXiv.1902.09935
- arXiv:
- arXiv:1902.09935
- Bibcode:
- 2019arXiv190209935P
- Keywords:
-
- Mathematics - Numerical Analysis;
- 35J05;
- 65N12;
- 65N15;
- 65N30
- E-Print:
- accepted for publication in Math. Comp