Destabilization of rotating flows with positive shear by azimuthal magnetic fields

Stefani, Frank and Kirillov, Oleg (2015) Destabilization of rotating flows with positive shear by azimuthal magnetic fields. Physical Review E, 92 (5). 051001(R). ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.92.051001

Abstract

According to Rayleigh's criterion, rotating flows are linearly stable when their specific angular momentum increases radially outward. The celebrated magnetorotational instability opens a way to destabilize those flows, as long as the angular velocity is decreasing outward. Using a local approximation we demonstrate that even flows with very steep positive shear can be destabilized by azimuthal magnetic fields which are current free within the fluid. We illustrate the transition of this instability to a rotationally enhanced kink-type instability in the case of a homogeneous current in the fluid, and discuss the prospects for observing it in a magnetized Taylor-Couette flow.

Item Type: Article
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Oleg Kirillov
Date Deposited: 09 Jan 2017 14:41
Last Modified: 11 Jan 2017 09:43
URI: http://nrl.northumbria.ac.uk/id/eprint/29028

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