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Lookup NU author(s): Dr Benjamin Favier,
Dr Celine Guervilly
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Cambridge University Press, 2019.
For re-use rights please refer to the publisher's terms and conditions.
The possibility of subcritical behaviour in the geostrophic turbulence regime of rapidly rotating thermally driven convection is explored. In this regime a non-local inverse energy transfer may compete with the more traditional and local direct cascade. We show that, even for control parameters for which no inverse cascade has previously been observed, a subcritical transition towards a large-scale vortex state can occur when the system is initialized with a vortex dipole of finite amplitude. This new example of bistability in a turbulent flow, which may not be specific to rotating convection, opens up new avenues for studying energy transfer in strongly anisotropic three-dimensional flows.
Author(s): Favier B, Guervilly C, Knobloch E
Publication type: Article
Publication status: Published
Journal: Journal of Fluid Mechanics
Print publication date: 10/04/2019
Online publication date: 07/02/2019
Acceptance date: 08/01/2019
Date deposited: 06/02/2019
ISSN (print): 0022-1120
ISSN (electronic): 1469-7645
Publisher: Cambridge University Press
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