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An Immersed Raviart–Thomas Mixed Finite Element Method for Elliptic Interface Problems on Unfitted Meshes

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Abstract

This paper presents a lowest-order immersed Raviart–Thomas mixed triangular finite element method for solving elliptic interface problems on unfitted meshes independent of the interface. In order to achieve the optimal convergence rates on unfitted meshes, an immersed finite element (IFE) is constructed by modifying the traditional Raviart–Thomas element. Some important properties are derived including the unisolvence of IFE basis functions, the optimal approximation capabilities of the IFE space and the corresponding commuting digram. Optimal finite element error estimates are proved rigorously with the constant independent of the interface location relative to the mesh. Some numerical examples are provided to validate the theoretical analysis.

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Acknowledgements

The author would like to thank the anonymous referees sincerely for their careful reading and helpful suggestions that improved the quality of the paper.

Funding

This work was partially supported by the National Natural Science Foundation of China (Grants Nos. 11701291, 12101327 and 11801281) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20200848).

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  1. School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210023, Jiangsu, China

    Haifeng Ji

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  1. Haifeng Ji
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Correspondence to Haifeng Ji.

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Ji, H. An Immersed Raviart–Thomas Mixed Finite Element Method for Elliptic Interface Problems on Unfitted Meshes. J Sci Comput 91, 66 (2022). https://doi.org/10.1007/s10915-022-01839-2

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  • DOI: https://doi.org/10.1007/s10915-022-01839-2

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