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Mean flow anisotropy without waves in rotating turbulence

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Brons, Jonathan A., Thomas, Peter J. and Pothérat, Alban (2020) Mean flow anisotropy without waves in rotating turbulence. Journal of Fluid Mechanics, 889 . A37. doi:10.1017/jfm.2020.109 ISSN 0022-1120.

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Official URL: http://dx.doi.org/10.1017/jfm.2020.109

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Abstract

We tackle the question of how anisotropy in flows subject to background rotation favours structures elongated along the rotation axis, especially in turbulent flows. A new, wave-free mechanism is identified that challenges the current understanding of the process. Inertial waves propagating near the rotation axis (Staplehurst et al. J. Fluid Mech., vol. 598, 2008, pp. 81–105; Yarom & Sharon, Nat. Phys., vol. 10(7), 2014, pp. 510–514) are generally accepted as the most efficient mechanism to transport energy anisotropically. They have been shown to transfer energy to large anisotropic, columnar structures. Nevertheless, they cannot account for the formation of simpler steady anisotropic phenomena such as Taylor columns. Here, we experimentally show that more than one mechanism involving the Coriolis force may promote anisotropy. In particular, in the limit of fast rotation, that is at low Rossby number, anisotropy favouring the direction of rotation of the average of a turbulent flow arises neither because of inertial waves nor following the same mechanism as in steady Taylor columns, but from an interplay between the Coriolis force and average advection.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Anisotropy, Turbulence, Rotating masses of fluid
Journal or Publication Title: Journal of Fluid Mechanics
Publisher: Cambridge University Press
ISSN: 0022-1120
Official Date: 25 April 2020
Dates:
DateEvent
25 April 2020Published
28 February 2020Available
31 January 2020Accepted
Volume: 889
Article Number: A37
DOI: 10.1017/jfm.2020.109
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 11 March 2020
Date of first compliant Open Access: 18 March 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
GR/N64519/01[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
WM140032Royal Societyhttp://dx.doi.org/10.13039/501100000288

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