Article Dans Une Revue Physical Review Fluids Année : 2024

Gyre turbulence: Anomalous dissipation in a two-dimensional ocean model

Résumé

The exploration of a two-dimensional wind-driven ocean model with no-slip boundaries reveals the existence of a turbulent asymptotic regime where energy dissipation becomes independent of fluid viscosity. This asymptotic flow represents an out-of-equilibrium state, characterized by a vigorous two-dimensional vortex gas superimposed onto a westernintensified gyre. The properties of the vortex gas are elucidated through scaling analysis for detached Prandtl boundary layers, providing a rationalization for the observed anomalous dissipation. The asymptotic regime demonstrates that boundary instabilities alone can be strong enough to evacuate wind-injected energy from the large-scale oceanic circulation.

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hal-04765467 , version 1 (16-07-2025)

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Lennard Miller, Bruno Deremble, Antoine Venaille. Gyre turbulence: Anomalous dissipation in a two-dimensional ocean model. Physical Review Fluids, 2024, 9 (5), pp.L051801. ⟨10.1103/PhysRevFluids.9.L051801⟩. ⟨hal-04765467⟩
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