Error estimates for perturbed variational inequalities of the first kind

detalle del documento

IDENTIFICACIÓN

oai:arXiv.org:2410.22052

Tema

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

Autor

Banz, Lothar Schönauer, Miriam Schröder, Andreas

Categoría

Computer Science

Año

2024

fecha de cotización

6/11/2024

Palabras clave

estimates variational error

Métrico

Resumen

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