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Proceedings/Recueil Des Communications Proceedings of the National Academy of Sciences of the United States of America Année : 2021

Experimental observation of the geostrophic turbulence regime of rapidly rotating convection

Résumé

The competition between turbulent convection and global rota-tion in planetary and stellar interiors governs the transport of heat and tracers, as well as magnetic field generation. These objects operate in dynamical regimes ranging from weakly rotat -ing convection to the "geostrophic turbulence" regime of rapidly rotating convection. However, the latter regime has remained elusive in the laboratory, despite a worldwide effort to design ever-taller rotating convection cells over the last decade. Building on a recent experimental approach where convection is driven ra-diatively, we report heat transport measurements in quantitative agreement with this scaling regime, the experimental scaling law being validated against direct numerical simulations (DNS) of the idealized setup. The scaling exponent from both experiments and DNS agrees well with the geostrophic turbulence prediction. The prefactor of the scaling law is greater than the one diagnosed in previous idealized numerical studies, pointing to an unexpected sensitivity of the heat transport efficiency to the precise distribu-tion of heat sources and sinks, which greatly varies from planets to stars.

Dates et versions

cea-04484307 , version 1 (29-02-2024)

Identifiants

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Vincent Bouillaut, Benjamin Miquel, Keith Julien, Sébastien Aumaître, Basile Gallet. Experimental observation of the geostrophic turbulence regime of rapidly rotating convection. National Academy of Sciences of the United States of America, Proceedings of the National Academy of Sciences of the United States of America, 118 (44), 2021, ⟨10.1073/pnas.2105015118⟩. ⟨cea-04484307⟩
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