Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry

Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry
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弱应力对称性线弹性的域分解与多尺度砂浆混合有限元法

DOI:
10.1051/m2an/2019057
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发表时间:
2019
期刊:
ESAIM: Mathematical Modelling and Numerical Analysis
影响因子:
--
通讯作者:
Yotov, Ivan
Yotov, Ivan
中科院分区:
--
文献类型:
--
作者:
Khattatov, Eldar;Yotov, Ivan

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本文提出了两种非重叠区域分解法,用于求解弱应力对称性线弹性问题的混合有限元列式。该方法利用位移或法向应力拉格朗日乘子来分别施加法向应力或位移的界面连续性。通过消去内部子域变量,将全局问题转化为界面问题,然后用迭代法求解。这两种方法的代数接口问题的条件数进行了分析。本文还研究了在非匹配多块网格上求解该问题的多尺度砂浆混合有限元方法。该方法在非匹配界面上采用粗尺度砂浆有限元空间来逼近位移轨迹,并对正应力的连续性进行了较弱的处理,并进行了优先误差分析。结果表明,适当选择砂浆空间,最佳收敛的精细尺度上得到的应力,位移和旋转,以及一些超收敛的位移。计算结果证实了所有提出的方法的理论。
Two non-overlapping domain decomposition methods are presented for the mixed finite element formulation of linear elasticity with weakly enforced stress symmetry. The methods utilize either displacement or normal stress Lagrange multiplier to impose interface continuity of normal stress or displacement, respectively. By eliminating the interior subdomain variables, the global problem is reduced to an interface problem, which is then solved by an iterative procedure. The condition number of the resulting algebraic interface problem is analyzed for both methods. A multiscale mortar mixed finite element method for the problem of interest on non-matching multiblock grids is also studied. It uses a coarse scale mortar finite element space on the non-matching interfaces to approximate the trace of the displacement and impose weakly the continuity of normal stress.A priorierror analysis is performed. It is shown that, with appropriate choice of the mortar space, optimal convergence on the fine scale is obtained for the stress, displacement, and rotation, as well as some superconvergence for the displacement. Computational results are presented in confirmation of the theory of all proposed methods.
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发表时间: 2020
影响因子: 2.9
作者:
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