期刊
JOURNAL OF FLUID MECHANICS
卷 864, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2019.58
关键词
Benard convection; geostrophic turbulence; turbulent transition
资金
- project Equip@Meso of the programme 'Investissements d'Avenir' [ANR-10-EQPX-29-01]
- GENCI-IDRIS [A0020407543, A0040407543]
- UK Natural Environment Research Council [NE/M017893/1]
- European Research Council under the European Union [681835-FLUDYCO-ERC-2015-CoG]
- Lorentz Center at the University of Leiden
- NERC [NE/M017893/1] Funding Source: UKRI
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 such as atmospheric or oceanic circulations.
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