Název:
On the quality of local flux reconstructions for guaranteed error bounds
Autoři:
Vejchodský, Tomáš Typ dokumentu: Příspěvky z konference Konference/Akce: Applications of Mathematics 2015, Prague (CZ), 2015-11-18 / 2015-11-21
Rok:
2015
Jazyk:
eng
Abstrakt: In this contribution we consider elliptic problems of a reaction-diffucion type discretized by the finite element method and study the quality of guaranteed upper bounds of the error. In particular, we concentrate on complementary error bounds whose values are determined by suitable flux reconstructions. We present numerical experiments comparing the performance of the local flux reconstruction of Ainsworth and Vejchodský [2] and the reconstruction of Braess and Schröberl [5]. We evaluate the efficiency of these flux reconstructions by their comparison with the optimal flux reconstruction computed as a global minimization problem.
Klíčová slova:
a posteriori error estimates; complementarity; elliptic problem; index of effectivity Číslo projektu: GA14-02067S (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: Applications of Mathematics 2015, ISBN 978-80-85823-65-3