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.
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The first author is partially supported by NSFC under the grant 10601070 and by an Alexander von Humboldt fellowship hosted by Freie Universität Berlin.
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Zou, Q., Veeser, A., Kornhuber, R. et al. Hierarchical error estimates for the energy functional in obstacle problems. Numer. Math. 117, 653–677 (2011). https://doi.org/10.1007/s00211-011-0364-5
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DOI: https://doi.org/10.1007/s00211-011-0364-5