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Turbulent transport and dynamo in sheared MHD turbulence with a non-uniform magnetic field

Leprovost , N. and Kim, E. (2009) Turbulent transport and dynamo in sheared MHD turbulence with a non-uniform magnetic field. Physical Review E, 80 (2). Art. No. 026302. ISSN 1550-2376

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Abstract

We investigate three-dimensional magnetohydrodynamics turbulence in the presence of velocity and magnetic shear (i.e., with both a large-scale shear flow and a nonuniform magnetic field). By assuming a turbulence driven by an external forcing with both helical and nonhelical spectra, we investigate the combined effect of these two shears on turbulence intensity and turbulent transport represented by turbulent diffusivities (turbulent viscosity, α and β effect) in Reynolds-averaged equations. We show that turbulent transport (turbulent viscosity and diffusivity) is quenched by a strong flow shear and a strong magnetic field. For a weak flow shear, we further show that the magnetic shear increases the turbulence intensity while decreasing the turbulent transport. In the presence of a strong flow shear, the effect of the magnetic shear is found to oppose the effect of flow shear (which reduces turbulence due to shear stabilization) by enhancing turbulence and transport, thereby weakening the strong quenching by flow shear stabilization. In the case of a strong magnetic field (compared to flow shear), magnetic shear increases turbulence intensity and quenches turbulent transport.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 The American Physical Society. This is an author produced version of a paper published in 'Physical Review E'. Uploaded in accordance with the publisher's self-archiving policy.
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: 24 Mar 2010 16:29
Last Modified: 16 Jun 2014 09:05
Published Version: http://dx.doi.org/10.1103/PhysRevE.80.026302
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevE.80.026302
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10504

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