A Hausdorff-measure boundary element method for acoustic scattering by fractal screens
A Hausdorff-measure boundary element method for acoustic scattering by fractal screens
复制标题
分形屏声散射的豪斯多夫测量边界元法
DOI:
10.1007/s00211-024-01399-7
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发表时间:
2024
影响因子:
2.1
通讯作者:
Caetano A
中科院分区:
文献类型:
--
作者:
Caetano A
Sound-soft fractal screens can scatter acoustic waves even when they have zero surface measure. To solve such scattering problems we make what appears to be the first application of the boundary element method (BEM) where each BEM basis function is supported in a fractal set, and the integration involved in the formation of the BEM matrix is with respect to a non-integer order Hausdorff measure rather than the usual (Lebesgue) surface measure. Using recent results on function spaces on fractals, we prove convergence of the Galerkin formulation of this “Hausdorff BEM” for acoustic scattering in() when the scatterer, assumed to be a compact subset of, is ad-set for some, so that, in particular, the scatterer has Hausdorff dimensiond. For a class of fractals that are attractors of iterated function systems, we prove convergence rates for the Hausdorff BEM and superconvergence for smooth antilinear functionals, under certain natural regularity assumptions on the solution of the underlying boundary integral equation. We also propose numerical quadrature routines for the implementation of our Hausdorff BEM, along with a fully discrete convergence analysis, via numerical (Hausdorff measure) integration estimates and inverse estimates on fractals, estimating the discrete condition numbers. Finally, we show numerical experiments that support the sharpness of our theoretical results, and our solution regularity assumptions, including results for scattering inby Cantor sets, and inby Cantor dusts.
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影响因子:
0.8
作者:
Chandler-Wilde S
通讯作者:
Chandler-Wilde S
DOI:
10.1142/s021953051650024x
发表时间:
2015
期刊:
arXiv: Functional Analysis
影响因子:
--
作者:
D. Hewett;A. Moiola
通讯作者:
A. Moiola
影响因子:
0.8
作者:
S. Chandler;D. Hewett;A. Moiola
通讯作者:
A. Moiola
影响因子:
2.1
作者:
Chandler-Wilde S
通讯作者:
Chandler-Wilde S
影响因子:
2.1
作者:
Gibbs A
通讯作者:
Gibbs A