Název:
Computing upper bounds on Friedrichs' constant
Autoři:
Vejchodský, Tomáš Typ dokumentu: Příspěvky z konference Konference/Akce: Applications of Mathematics 2012, Prague (CZ), 2012-05-02 / 2012-05-05
Rok:
2012
Jazyk:
eng
Abstrakt: This contribution shows how to compute upper bounds of the optimal constant in Friedrichs’ and similar inequalities. The approach is based on the method of a prioria posteriori inequalities [9]. However, this method requires trial and test functions with continuous second derivatives. We show how to avoid this requirement and how to compute the bounds on Friedrichs’ constant using standard finite element methods. This approach is quite general and allows variable coefficients and mixed boundary conditions. We use the computed upper bound on Friedrichs’ constant in a posteriori error estimation to obtain guaranteed error bounds.
Klíčová slova:
Friedrichs' constant Číslo projektu: IAA100760702 (CEP) Poskytovatel projektu: GA AV ČR Zdrojový dokument: Proceedings of the International Conference Applications of Mathematics 2012, ISBN 978-80-85823-60-8