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Investigation into the dual role of shear flow in 2D MHD turbulence

Newton, A.P.L. and Kim, E.J. (2009) Investigation into the dual role of shear flow in 2D MHD turbulence. Physical Review Letters, 102 (16). Art. No.165002. ISSN 0031-9007

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Abstract

The turbulent diffusion eta(T) of a large-scale magnetic field B-0 is numerically studied in two-dimensional magnetohydrodynamic turbulence with an imposed shear flow. We demonstrate that a shear flow plays a dual role, quenching transport through shear destruction and enhancing it via resonance. Specifically without resonance eta(T)proportional to B-0(-4) with no shear (rms shearing rate=Omega=0) and eta(T)proportional to Omega(-2.7) for B-0=0, while with resonance eta(T)proportional to B-0(-2)proportional to Omega(-2). These results indicate that the absence of resonance is responsible for the most catastrophic reductions in transport.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Physical Society. This is an author produced version of a paper subsequently published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: VELOCITY SHEAR; TRANSPORT; SUPPRESSION; FIELD
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 27 May 2009 16:26
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1103/PhysRevLett.102.165002
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevLett.102.165002
URI: http://eprints.whiterose.ac.uk/id/eprint/8611

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