Abstract
In this paper, we focus on pressure-robust analysis of a mixed finite element method for the numerical discretization of nonstationary magnetohydrodynamics system. The velocity field is discretized by divergence-conforming Raviart-Thomas spaces with interior penalties, and the magnetic equation is approximated by curl-conforming Nédélec edge elements. The main feature of the method is that it produces exactly divergence-free velocity approximation, and captures the strongest magnetic singularities. The results show that the proposed scheme meets a discrete unconditional energy stability and the numerical solution is well-posedness. In addition, a priori error estimates are given, in which the constants are independent of the Reynolds number. Finally, we provide several numerical results illustrating the good performance of the scheme and confirming the theoretical rates of convergence.
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Acknowledgements
The authors thank the anonymous referees very much for their valuable comments and suggestions which helped to improve the quality of this paper.
Funding
This work is supported by the Natural Science Foundation of China (Nos. 11871467 and 12161141017), Shandong Province Natural Science Foundation (ZR2021QA054) and China Postdoctoral Science Foundation (2021M691951).
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Ding, Q., Mao, S. & Sun, J. Error estimates of H(div)-conforming method for nonstationary magnetohydrodynamic system. Adv Comput Math 48, 55 (2022). https://doi.org/10.1007/s10444-022-09964-0
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DOI: https://doi.org/10.1007/s10444-022-09964-0