Convergence of an adaptive finite element DtN method for the elastic wave scattering by periodic structures
Abstract
Consider the scattering of a time-harmonic elastic plane wave by a periodic rigid surface. The elastic wave propagation is governed by the two-dimensional Navier equation. Based on a Dirichlet-to-Neumann (DtN) map, a transparent boundary condition (TBC) is introduced to reduce the scattering problem into a boundary value problem in a bounded domain. By using the finite element method, the discrete problem is considered, where the TBC is replaced by the truncated DtN map. A new duality argument is developed to derive the a posteriori error estimate, which contains both the finite element approximation error and the DtN truncation error. An a posteriori error estimate based adaptive finite element algorithm is developed to solve the elastic surface scattering problem. Numerical experiments are presented to demonstrate the effectiveness of the proposed method.
Keywords
Cite
@article{arxiv.1905.04143,
title = {Convergence of an adaptive finite element DtN method for the elastic wave scattering by periodic structures},
author = {Peijun Li and Xiaokai Yuan},
journal= {arXiv preprint arXiv:1905.04143},
year = {2020}
}
Comments
arXiv admin note: text overlap with arXiv:1903.03606