Abstract
We investigate the piecewise linear nonconforming Crouzeix–Raviart and the lowest order Raviart–Thomas finite-element methods for the Poisson problem on three-dimensional anisotropic meshes. We first give error estimates of the Crouzeix–Raviart and the Raviart–Thomas finite-element approximate problems. We next present the equivalence between the Raviart–Thomas finite-element method and the enriched Crouzeix–Raviart finite-element method. We emphasize that we do not impose either shape-regular or maximum-angle condition during mesh partitioning. Numerical results confirm the results that we obtained.
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Notes
Note added in proof. [16,Theorem 2] is incorrect. See the erratum in https://arxiv.org/abs/2002.09721
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Acknowledgements
This work was supported by JSPS KAKENHI Grant Number JP16H03950. We would like to thank the anonymous referee for the valuable comments.
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Ishizaka, H., Kobayashi, K. & Tsuchiya, T. Crouzeix–Raviart and Raviart–Thomas finite-element error analysis on anisotropic meshes violating the maximum-angle condition . Japan J. Indust. Appl. Math. 38, 645–675 (2021). https://doi.org/10.1007/s13160-020-00455-7
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DOI: https://doi.org/10.1007/s13160-020-00455-7