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Effects of shear and Alfven waves on two-dimensional magnetohydrodynamic turbulence

Douglas, J., Kim, E. and Thyagaraja, A. (2008) Effects of shear and Alfven waves on two-dimensional magnetohydrodynamic turbulence. Physics of Plasmas, 15 (5). Art. No. 052301. ISSN 1070-664X

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The suppression of turbulent transport by large scale mean shear flows and uniform magnetic fields is investigated in two-dimensional magnetohydrodynamic turbulence driven by a small-scale forcing with finite correlation time. By numerical integration the turbulent magnetic diffusivity DT is shown to be significantly quenched, with a scaling DT∝B−2Ω0−5/4, which is much more severe than in the case of a short or delta correlated forcing typified by white noise, studied in E. Kim and B. Dubrulle [Phys. Plasmas 8, 813 (2001)] . Here B and Ω0 are magnetic field strength and flow shear rate, respectively. The forcing with finite correlation time also leads to much stronger suppression of momentum transport through the cancellation of the Reynolds stress by the Maxwell stress with a positive small value of turbulent viscosity, νT>0. While fluctuating kinetic and magnetic energies are unaffected by the magnetic field just as in the case of a delta correlated forcing, they are much more severely quenched by flow shear than in that of a delta correlated forcing. Underlying physical mechanisms for the reduction of turbulent transport and turbulence level by flow shear and magnetic field are discussed.

Item Type: Article
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 17 Mar 2010 13:36
Last Modified: 16 Nov 2015 11:48
Published Version: http://dx.doi.org/10.1063/1.2913270
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.2913270
URI: http://eprints.whiterose.ac.uk/id/eprint/10510

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