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

Khattatov, Eldar; Yotov, Ivan

doi:10.1051/m2an/2019057

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

Journal Article · Fri Nov 01 04:00:00 EDT 2019 · Mathematical Modelling and Numerical Analysis

DOI:https://doi.org/10.1051/m2an/2019057· OSTI ID:1800167

Khattatov, Eldar ^[1];

OSTI

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.

Research Organization:: Univ. of Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-04ER25618

OSTI ID:: 1800167

Journal Information:: Mathematical Modelling and Numerical Analysis, Journal Name: Mathematical Modelling and Numerical Analysis Journal Issue: 6 Vol. 53; ISSN 0764-583X

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

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