Dirichlet Boundary Value Correction using Lagrange Multipliers
Numerical Analysis
2019-03-19 v1
Abstract
We propose a boundary value correction approach for cases when curved boundaries are approximated by straight lines (planes) and Lagrange multipliers are used to enforce Dirichlet boundary conditions. The approach allows for optimal order convergence for polynomial order up to 3. We show the relation to the Taylor series expansion approach used by Bramble, Dupont and Tom\'ee [Math. Comp., 26:869--879, 1972] in the context of Nitsche's method and, in the case of inf-sup stable multiplier methods, prove a priori error estimates with explicit dependence on the meshsize and distance between the exact and approximate boundary.
Cite
@article{arxiv.1903.07104,
title = {Dirichlet Boundary Value Correction using Lagrange Multipliers},
author = {Erik Burman and Peter Hansbo and Mats G. Larson},
journal= {arXiv preprint arXiv:1903.07104},
year = {2019}
}