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Spherical Couette flow in a dipolar magnetic field

Abstract : We consider numerically the flow of an electrically conducting fluid in a differentially rotating spherical shell, in a dipolar magnetic field. For infinitesimal differential rotation the flow consists of a super-rotating region, concentrated on the particular field line View the MathML source just touching the outer sphere, in agreement with previous results. Finite differential rotation suppresses this super-rotation, and pushes it inward, toward the equator of the inner sphere. For sufficiently strong differential rotation the outer boundary layer becomes unstable, yielding time-dependent solutions. Adding an overall rotation suppresses these instabilities again. The results are in qualitative agreement with the DTS liquid sodium experiment.
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Submitted on : Thursday, December 11, 2008 - 11:38:31 AM
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R. Hollerbach, Elisabeth Canet, Alexandre Fournier. Spherical Couette flow in a dipolar magnetic field. European Journal of Mechanics - B/Fluids, Elsevier, 2007, 26 (6), pp.729 à 737. ⟨10.1016/j.euromechflu.2007.02.002⟩. ⟨insu-00346226⟩



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