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The momentum flux probability distribution function for ion-temperature-gradient turbulence

Anderson, J. and Kim, E. (2008) The momentum flux probability distribution function for ion-temperature-gradient turbulence. Physics of Plasmas, 15 (5). Art. No. 052306. ISSN 1070-664X

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There has been overwhelming evidence that coherent structures play a critical role in determining the overall transport in a variety of systems. We compute the probability distribution function (PDF) tails of momentum flux and heat flux in ion-temperature-gradient turbulence, by taking into account the interaction among modons, which are assumed to be coherent structures responsible for bursty and intermittent events, contributing to the PDF tails. The tail of PDF of momentum flux R = 〈vxvy〉 is shown to be exponential with the form exp{−ξR3/2}, which is broader than a Gaussian, similar to what was found in the previous local studies. An analogous expression with the same functional dependence is found for the PDF tails of heat flux. Furthermore, we present a detailed numerical study of the dependence of the PDF tail on the temperature and density scale lengths and other physical parameters through the coefficient ξ.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 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 13:31
Last Modified: 21 Nov 2015 15:18
Published Version: http://dx.doi.org/10.1063/1.2918338
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.2918338
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10509

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