The Artificial Boundary Method for a Nonlinear Interface Problem on Unbounded Domain

The Artificial Boundary Method for a Nonlinear Interface Problem on Unbounded Domain
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无界域非线性界面问题的人工边界法

DOI:
10.3970/cmes.2008.035.227
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发表时间:
2008-10
影响因子:
2.4
通讯作者:
Huang, Hong-ying
Huang, Hong-ying
中科院分区:
工程技术4区
文献类型:
--
作者:
Yu, De-hao;Huang, Hong-ying

文献摘要

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本文应用人工边界法求解无界区域上的三维非线性界面问题.引入球面或椭球面作为人工边界。精确的人工边界条件推导显式的无穷级数,然后耦合弱列式在有界区域,这是等价的原问题在无界区域,得到的适定性。误差估计取决于网格尺寸、截断无穷级数后的项和人工边界的位置。数值算例验证了该方法的有效性和准确性。关键词:人工边界法,Dirichlet到Neumann映射,有限元法,自然积分算子,非线性界面问题。
In thispaper, we apply the artificial boundary method to solvea three- dimensional nonlinear interface problem on an unbounded domain. A spherical or ellipsoidal surface as the artificial boundary is introduced. The exact artificial boundary conditions are derived explicitly in terms of an infinite series and then the well-posedness of the coupled weak formulation in a bounded domain, which is equivalent to the original problem in the unbounded domain, is obtained. The error estimate depends on the mesh size, the term after truncating the infinite series and the location of the artificial boundary. Some numerical examples are presented to demonstrate the effectiveness and accuracy of this method. Keyword: Artificial boundary method, Dirichlet to Neumann mapping, Finite element method, Natural integral operator, Nonlinear interface problem.
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