Anderson, J. and Kim, E. (2009) Non-perturbative statistical theory of intermittency in ITG drift wave turbulence with zonal flows. Nuclear Fusion, 49 (7). 075027-1. ISSN 0029-5515
Abstract
The probability distribution functions (PDFs) of momentum flux and zonal flow formation in ion-temperature-gradient (ITG) turbulence are investigated in two different models. The first is a general five-field model (ni, , Ti, Te, vi) where a reductive perturbation method is used to derive dynamical equations for drift waves and a zonal flow. The second is a reduced two-field model (, Ti) that has an exact non-linear solution (bipolar vortex soliton). In both models the exponential tails of the zonal flow PDFs are found with the same scaling ( ), but with different coefficients cZF. The PDFs of momentum flux is, however, found to be qualitatively different with the scaling (PDF ~ exp{−cMRs}), where s = 2 and s = 3/2 in the five and two-field models, respectively.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2009 IOP Science. This is an author produced version of a paper subsequently published in Nuclear Fusion. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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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: | 29 Mar 2010 11:23 |
Last Modified: | 19 Nov 2015 06:15 |
Published Version: | http://dx.doi.org/10.1088/0029-5515/49/7/075027 |
Status: | Published |
Publisher: | IOP Science |
Identification Number: | 10.1088/0029-5515/49/7/075027 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:10503 |