Abstract
We prove the existence, uniqueness and regularity of weak solutions of a coupled parabolic-elliptic model in 2D, and the existence of weak solutions in 3D; we consider the standard equations of magnetohydrodynamics with the advective terms removed from the velocity equation. Despite the apparent simplicity of the model, the proof in 2D requires results that are at the limit of what is available, including elliptic regularity in L 1 and a strengthened form of the Ladyzhenskaya inequality
which we derive using the theory of interpolation. The model potentially has applications to the method of magnetic relaxation introduced by Moffatt (J Fluid Mech 159:359–378, 1985) to construct stationary Euler flows with non-trivial topology.
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Communicated by V. Šverák
DSMcC is a member of the Warwick “MASDOC” doctoral training centre, which is funded by EPSRC Grant EP/HO23364/1. JCR is supported by an EPSRC Leadership Fellowship EP/G007470/1.
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McCormick, D.S., Robinson, J.C. & Rodrigo, J.L. Existence and Uniqueness for a Coupled Parabolic-Elliptic Model with Applications to Magnetic Relaxation. Arch Rational Mech Anal 214, 503–523 (2014). https://doi.org/10.1007/s00205-014-0760-y
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DOI: https://doi.org/10.1007/s00205-014-0760-y