Abstract
This paper focuses on a new error analysis and a recovering technique of frequently-used mixed FEMs for a dynamical incompressible magnetohydrodynamics (MHD) system. The methods use the standard inf-sup stable Taylor–Hood/MINI velocity-pressure space pairs to solve the Navier–Stokes equations and the Nédélec’s edge element for solving the magnetic field. We establish new and optimal error estimates. In particular, we prove that the method provides the optimal accuracy for the MINI element in \(L^2\)-norm and for the Taylor-Hood element in \(H^1\)-norm. The analysis is based on a modified Maxwell projection and the corresponding estimates in negative norms, while all the existing analysis is not optimal due to the strong coupling of system and the pollution of the lower-order Nédélec’s edge approximation in analysis. In addition, at any given time step, we develop a simple recovery technique for numerical approximation to the magnetic field of one order higher accuracy in the spatial direction.

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The author would like to thank the anonymous referees for the careful review and valuable suggestions and comments, which have greatly improved this article.
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The work of the author was supported in part by the National Science Foundation of China (11871234 and 12231003) and Hubei Key Laboratory of Engineering Modeling and Scientific Computing. The work of W. Qiu was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CityU 11302718). The work of W. Sun was partially supported by the National Natural Science Foundation of China (12231003 and 12071040), Guangdong Provincial Key Laboratory IRADS (2022B1212010006, UIC-R0400001-22) and Guangdong Higher Education Upgrading Plan (UIC-R0400024-21).
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Gao, H., Qiu, W. & Sun, W. New analysis of mixed FEMs for dynamical incompressible magnetohydrodynamics. Numer. Math. 153, 327–358 (2023). https://doi.org/10.1007/s00211-022-01341-9
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DOI: https://doi.org/10.1007/s00211-022-01341-9