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Residual and hierarchical a posteriori error estimatesfor nonconforming mixed finite element methods

Published online by Cambridge University Press:  15 December 2004

Linda El Alaoui
Affiliation:
CERMICS, École nationale des ponts et chaussées, 6 et 8, avenue Blaise Pascal, 77455 Marne la Vallée Cedex 2, France. elalaoui@cermics.enpc.fr.; ern@cermics.enpc.fr.
Alexandre Ern
Affiliation:
CERMICS, École nationale des ponts et chaussées, 6 et 8, avenue Blaise Pascal, 77455 Marne la Vallée Cedex 2, France. elalaoui@cermics.enpc.fr.; ern@cermics.enpc.fr.
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Abstract

We analyze residual and hierarchicala posteriori error estimates for nonconforming finite elementapproximations of elliptic problems with variable coefficients.We consider a finite volume box scheme equivalent toa nonconforming mixed finite element method in a Petrov–Galerkinsetting. We prove thatall the estimators yield global upper and local lower bounds for the discretizationerror. Finally, we present results illustrating the efficiency of theestimators, for instance, in the simulation of Darcy flows throughheterogeneous porous media.

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Type
Research Article
Copyright
© EDP Sciences, SMAI, 2004

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