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Resonance enhanced turbulent transport

Kim, E. and Newton, A. (2007) Resonance enhanced turbulent transport. Physics of Plasmas, 14 (12 ). Art. No. 122306. ISSN 1070-664X

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Abstract

The effect of oscillatory shear flows on turbulent transport of passive scalar fields is studied by numerical computations based on the results provided by E. Kim [Physics of Plasmas 13, 022308 (2006)] . Turbulent diffusion is found to depend crucially on the competition between suppression due to shearing and enhancement due to resonances, depending on the characteristic time and length scales of shear flow and turbulence. Enhancements in transport occur for turbulence with finite memory time either due to Doppler or parametric resonances. Scalings of turbulence amplitude and transport are provided in different parameter spaces. The results suggest that oscillatory shear flows are not only less efficient in regulating turbulence, but also can enhance the value of turbulent diffusion, accelerating turbulent transport.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 American Institute of Physics. This is an author produced version of a paper published in 'Physics of Plasmas'. 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: 17 Mar 2010 13:23
Last Modified: 12 Jun 2014 13:41
Published Version: http://dx.doi.org/10.1063/1.2821246
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.2821246
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10507

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