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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
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Official URL: http://dx.doi.org/10.1017/jfm.2020.109
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 | |||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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| 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: |
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| Volume: | 889 | |||||||||
| Article Number: | A37 | |||||||||
| DOI: | 10.1017/jfm.2020.109 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
| RIOXX Funder/Project Grant: |
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