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Convection géostrophique turbulente engendrée par chauffage radiatif

Vincent Bouillaut 1, 2 
2 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : We study rapidly rotating convection forced by a radiative heat source. Radiative heating is relevant to stellar and planetary interiors, where the main challenge is to quantify the transport of heat and tracers by turbulent convection, including the crucial impact of global rotation. Rotating convection can operate in various regimes ranging from weakly rotating convection to the "geostrophic turbulence" regime of rapidly rotating convection. The latter was predicted in 1979, and has been awaiting laboratory confirmation ever since, despite the development of ever-taller rotating convection experiments worldwide. The common point of these experiments is heat injection through conduction between the wall and the fluid, a rather inefficient transfer mechanism. The idea here is to use radiative forcing, i.e., a partially volumic heat source, to inject heat directly into the turbulent flow. This type of forcing has already proven able to achieve fully turbulent convection. We modified the existing experiment to subject the flow to uniform global rotation. After verifying, through the development of a finite difference code, that the threshold of rotating convection is hardly modified by the partially volumic heat source, we experimentally study the effect of rotation on the turbulent convective flow (in terms of dimensionless heat flux). We observe that, for sufficiently fast rotation, the efficiency of thermal convection decreases as compared to the case without rotation. Finally, we show that this decrease follows the scaling prediction of the "geostrophic turbulence" regime. Radiative heating thus allows us to provide the first clear experimental observation of this extreme regime.
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Submitted on : Tuesday, May 24, 2022 - 5:22:31 PM
Last modification on : Wednesday, May 25, 2022 - 3:48:06 AM

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  • HAL Id : tel-03677597, version 1

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Vincent Bouillaut. Convection géostrophique turbulente engendrée par chauffage radiatif. Fluid Dynamics [physics.flu-dyn]. Université Paris-Saclay, 2022. English. ⟨NNT : 2022UPASP008⟩. ⟨tel-03677597⟩

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