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Article Dans Une Revue Journal of Fluid Mechanics Année : 2019

Subcritical turbulent condensate in rapidly rotating Rayleigh-Bénard convection

Résumé

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.
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Dates et versions

hal-02351103 , version 1 (06-11-2019)

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Benjamin Favier, Céline Guervilly, Edgar Knobloch. Subcritical turbulent condensate in rapidly rotating Rayleigh-Bénard convection. Journal of Fluid Mechanics, 2019, 864, ⟨10.1017/jfm.2019.58⟩. ⟨hal-02351103⟩
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