Abstract
We investigate why the non-slip boundary condition for the velocity, imposed in the direction of impressed magnetic fields, can contribute to the magnetic inhibition effect based on the magnetic Rayleigh–Taylor (abbr. NMRT) problem in nonhomogeneous incompressible non-resistive magnetohydrodynamic (abbr. MHD) fluids. Exploiting an infinitesimal method in Lagrangian coordinates, the idea of (equivalent) magnetic tension, and the differential version of magnetic flux conservation, we give an explanation of a physical mechanism for the magnetic inhibition phenomenon in a non-resistive MHD fluid. Moreover, we find that the magnetic energy in the non-resistive MHD fluid depends on the displacement of fluid particles, and thus can be regarded as elastic potential energy. Motivated by this observation, we further use the well-known minimum potential energy principle to explain the physical meaning of the stability/instability criteria in the NMRT problem. As a result of the analysis, we further extend the results on the NMRT problem to the stratified MHD fluid case. We point out that our magnetic inhibition theory can be used to explain the inhibition phenomenon of other flow instabilities, such as thermal instability, magnetic buoyancy instability, and so on, by impressed magnetic fields in non-resistive MHD fluids.
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Acknowledgements
The authors thank Dr. Weicheng Zhan for pointing out Lemmas 4.1 and 4.5, and Prof. C.H. Arthur Cheng for kindly discussing the global existence thereon of inverse functions. The authors also thank the anonymous referee for invaluable suggestions, which improve the presentation of this paper.
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The research of Fei Jiang was supported by the NSFC (Grant No. 11671086) and the NSF of Fujian Province of China (Grant No. 2016J06001), and the research of Song Jiang by the NSFC (Grant Nos. 11631008 and 11371065)
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Jiang, F., Jiang, S. On Magnetic Inhibition Theory in Non-resistive Magnetohydrodynamic Fluids. Arch Rational Mech Anal 233, 749–798 (2019). https://doi.org/10.1007/s00205-019-01367-8
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DOI: https://doi.org/10.1007/s00205-019-01367-8