Abstract
In this paper, we are concerned with space-time a posteriori error estimators for fully discrete solutions of linear parabolic problems. The mixed formulation with Raviart–Thomas finite element spaces is considered. A new second-order method in time is proposed so that mixed finite element spaces are permitted to change at different time levels. The new method can be viewed as a variant Crank–Nicolson (CN) scheme. Introducing a CN reconstruction appropriate for the mixed setting, we construct an a posteriori error estimator of second order in time for the variant CN mixed scheme. Various numerical examples are given to test our space-time adaptive algorithm and validate the theory proved in the paper. In addition, numerical results for backward Euler and CN schemes are presented to compare their performance in the time adaptivity setting over uniform/adaptive spatial meshes.
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The authors would like to thank the anonymous reviewers for their valuable comments and suggestions which improved the quality of the paper.
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Dongho Kim was supported by NRF-2013R1A1A2007462. Eun-Jae Park was supported by NRF-2015R1A5A1009350 and NRF-2016R1A2B4014358.
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Kim, D., Park, EJ. & Seo, B. Space-Time Adaptive Methods for the Mixed Formulation of a Linear Parabolic Problem. J Sci Comput 74, 1725–1756 (2018). https://doi.org/10.1007/s10915-017-0514-8
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DOI: https://doi.org/10.1007/s10915-017-0514-8
Keywords
- Space-time adaptivity
- A posteriori error estimators
- Discontinuous Galerkin method
- Mixed finite element method
- CN reconstruction
- CN scheme