Multiscale-Spectral GFEM and Optimal Oversampling
Multiscale-Spectral GFEM and Optimal Oversampling
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DOI:
10.1016/j.cma.2020.112960
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发表时间:
2019-10
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影响因子:
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通讯作者:
I. Babuska;R. Lipton;Paul Sinz;M. Stuebner
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文献类型:
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作者:
I. Babuska;R. Lipton;Paul Sinz;M. Stuebner
In this work we address the Multiscale Spectral Generalized Finite Element Method (MS-GFEM) developed in Babuška and Lipton (2011). We outline the numerical implementation of this method and present simulations that demonstrate contrast independent exponential convergence of MS-GFEM solutions. We introduce strategies to reduce the computational cost of generating the optimal oversampled local approximating spaces used here. These strategies retain accuracy while reducing the computational work necessary to generate local bases. Motivated by oversampling we develop a nearly optimal local basis based on a partition of unity on the boundary and the associated A-harmonic extensions.