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 priori error 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.
Accepté le :
DOI : 10.1051/m2an/2019057
Mots-clés : Domain decomposition, mixed finite elements, mortar finite elements, multiscale methods, linear elasticity
@article{M2AN_2019__53_6_2081_0, author = {Khattatov, Eldar and Yotov, Ivan}, title = {Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {2081--2108}, publisher = {EDP-Sciences}, volume = {53}, number = {6}, year = {2019}, doi = {10.1051/m2an/2019057}, mrnumber = {4040714}, zbl = {1434.65263}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2019057/} }
TY - JOUR AU - Khattatov, Eldar AU - Yotov, Ivan TI - Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2019 SP - 2081 EP - 2108 VL - 53 IS - 6 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2019057/ DO - 10.1051/m2an/2019057 LA - en ID - M2AN_2019__53_6_2081_0 ER -
%0 Journal Article %A Khattatov, Eldar %A Yotov, Ivan %T Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2019 %P 2081-2108 %V 53 %N 6 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2019057/ %R 10.1051/m2an/2019057 %G en %F M2AN_2019__53_6_2081_0
Khattatov, Eldar; Yotov, Ivan. Domain decomposition and multiscale mortar mixed finite element methods for linear elasticity with weak stress symmetry. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 53 (2019) no. 6, pp. 2081-2108. doi : 10.1051/m2an/2019057. http://www.numdam.org/articles/10.1051/m2an/2019057/
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