Error estimates for perturbed variational inequalities of the first kind

Document detail

ID

oai:arXiv.org:2410.22052

Topic

Mathematics - Numerical Analysis 65K15, 65N15, 35J86

Author

Banz, Lothar Schönauer, Miriam Schröder, Andreas

Year

2024

listing date

11/6/2024

Keywords

estimates variational error

Metrics

Abstract

In this paper, we derive a priori error estimates for variational inequalities of the first kind in an abstract framework.

This is done by combining the first Strang Lemma and the Falk Theorem.

The main application consists in the derivation of a priori error estimates for Galerkin methods, in which "variational crimes" may perturb the underlying variational inequality.

Different types of perturbations are incorporated into the abstract framework and discussed by various examples.

For instance, the perturbation caused by an inexact quadrature is examined in detail for the Laplacian obstacle problem.

For this problem, guaranteed rates for the approximation error resulting from the use of higher-order finite elements are derived.

In numerical experiments, the influence of the number of quadrature points on the approximation error and on the quadrature-related error itself is studied for several discretization methods.

Banz, Lothar,Schönauer, Miriam,Schröder, Andreas, 2024, Error estimates for perturbed variational inequalities of the first kind