Abstract
The first-order div least squares finite element methods provide inherent a posteriori error estimator by the elementwise evaluation of the functional. In this paper we prove Q-linear convergence of the associated adaptive mesh-refining strategy for a sufficiently fine initial mesh with some sufficiently large bulk parameter for piecewise constant right-hand sides in a Poisson model problem. The proof relies on some modification of known supercloseness results to non-convex polygonal domains plus the flux representation formula. The analysis is carried out for the lowest-order case in two-dimensions for the simplicity of the presentation.
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Acknowledgements
The authors thank Eunjung Lee of the Department of Computational Science and Engineering of Yonsei University in Seoul, Korea, and Gerhard Starke from the Faculty of Mathematics of the University of Duisburg-Essen, Germany, for valuable discussions.
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This research was supported by the Deutsche Forschungsgemeinschaft in the Priority Program 1748 “Reliable simulation techniques in solid mechanics. Development of non- standard discretization methods, mechanical and mathematical analysis” under the project “Foundation and application of generalized mixed FEM towards nonlinear problems in solid mechanics” (CA 151/22-1). This research was supported in part by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology NRF 2011-0030934 and NRF-2015R1A5A1009350.
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Carstensen, C., Park, EJ. & Bringmann, P. Convergence of natural adaptive least squares finite element methods. Numer. Math. 136, 1097–1115 (2017). https://doi.org/10.1007/s00211-017-0866-x
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DOI: https://doi.org/10.1007/s00211-017-0866-x