An adaptive coupling method for exterior anisotropic elliptic problems

An adaptive coupling method for exterior anisotropic elliptic problems
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外各向异性椭圆问题的自适应耦合方法

DOI:
10.1016/j.amc.2015.10.019
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发表时间:
2016-01
影响因子:
4
通讯作者:
Yue Gao
Yue Gao
中科院分区:
数学2区
文献类型:
--
作者:
Quan Zheng;Feng Qin;Yue Gao

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相似文献

本文提出了一种求解无界区域上各向异性椭圆型偏微分方程组的自适应耦合方法。首先,证明了耦合方法解的存在唯一性,并得到了在人工边界积分条件下,依赖于有限元网格大小、椭圆人工边界的位置和无穷级数截断的H1模和L2模的先验误差估计。其次,给出了耦合方法的后验误差估计和后验误差指标。最后,自适应耦合方法利用弧长均匀分布原理和后验误差指示器依次对网格分布进行细化。数值算例验证了该方法在精度和效率上的优势。
In this paper, we propose an adaptive coupling method for solving anisotropic elliptic PDEs in unbounded domains. Firstly, the existence and the uniqueness of the solution for the coupling method are proven, and the a priori error estimates inH1-norm andL2-norm that depend on the size of the FEM mesh, the location of the elliptic artificial boundary and the truncation of the infinite series in the artificial boundary integral condition are derived. Secondly, the a posteriori error estimates and the a posteriori error indicator of the coupling method are obtained. Finally, the adaptive coupling method refines the mesh distribution by the arc-length equidistribution principle and the a posteriori error indicator successively. Numerical examples confirm the advantage in accuracy and efficiency for the proposed method.
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