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Kinematic simulation for stably stratified and rotating turbulence

Nicolleau, F., Yu, G. and Vassilicos, J.C. (2008) Kinematic simulation for stably stratified and rotating turbulence. Fluid Dynamics Research, 40 (1). pp. 68-93. ISSN 0169-5983

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Abstract

The properties of one-particle and particle-pair diffusion in rotating and stratified turbulence are studied by applying the rapid distortion theory (RDT) to a kinematic simulation (KS) of the Boussinesq equation with a Coriolis term.

Scalings for one- and two-particle horizontal and vertical diffusions in purely rotating turbulence are proposed for small Rossby numbers.

Particular attention is given to the locality-in-scale hypothesis for two-particle diffusion in purely rotating turbulence both in the horizontal and the vertical directions. It is observed that both rotation and stratification decrease the pair diffusivity and improve the validity of the locality-in-scale hypothesis. In the case of stratification the range of scales over which the locality-in-scale hypothesis is observed is increased.

It is found that rotation decreases the diffusion in the horizontal direction as well as, though to a much lesser extent, in the vertical direction.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 The Japan Society of Fluid Mechanics Incorporated and Elsevier B.V. . This is an author produced version of a paper published in Fluid Dynamics Research. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 21 Feb 2008 11:38
Last Modified: 05 Jun 2014 19:35
Published Version: http://dx.doi.org/10.1016/j.fluiddyn.2006.08.011
Status: Published
Publisher: Elsevier B.V.
Refereed: Yes
Identification Number: 10.1016/j.fluiddyn.2006.08.011
URI: http://eprints.whiterose.ac.uk/id/eprint/3655

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