We present a hierarchical a posteriori error analysis for the minimum value of the energy functional in symmetric obstacle problems. The main result is that the error in the energy minimum is, up to oscillation terms, equivalent to an appropriate hierarchical estimator. The proof does not invoke any saturation assumption. We even show that small oscillation implies a related saturation assumption. In addition, we prove efficiency and reliability of an a posteriori estimate of the discretization error and thereby cast some light on the theoretical understanding of previous hierarchical estimators. Finally, we illustrate our theoretical results by numerical computations.

Hierarchical error estimates for the energy functional in obstacle problems / Q. Zou, A. Veeser, R. Kornhuber, C. Gräser. - In: NUMERISCHE MATHEMATIK. - ISSN 0029-599X. - 117:4(2011 Apr), pp. 653-677. [10.1007/s00211-011-0364-5]

Hierarchical error estimates for the energy functional in obstacle problems

A. Veeser;
2011

Abstract

We present a hierarchical a posteriori error analysis for the minimum value of the energy functional in symmetric obstacle problems. The main result is that the error in the energy minimum is, up to oscillation terms, equivalent to an appropriate hierarchical estimator. The proof does not invoke any saturation assumption. We even show that small oscillation implies a related saturation assumption. In addition, we prove efficiency and reliability of an a posteriori estimate of the discretization error and thereby cast some light on the theoretical understanding of previous hierarchical estimators. Finally, we illustrate our theoretical results by numerical computations.
adaptive finite-elements; variational-inequalities; posteriori; efficient
Settore MAT/08 - Analisi Numerica
apr-2011
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/155672
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