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Pré-Publication, Document De Travail Année : 2023

Gyre Turbulence

Résumé

Investigation of a two-dimensional model for large-scale oceanic gyres reveals the existence of an asymptotic turbulent regime in which the energy dissipation becomes independent of the fluid viscosity. The role of the no-slip boundary conditions is critical: the inverse cascading behaviour of two-dimensional turbulence described previously for free-slip conditions is halted by vortex fragmentation through collisions with lateral walls. This leads to a distribution of dissipation events resembling a lognormal function, but a departure from this lognormal pattern appears in the distribution's tail, corresponding to intense vortices that dominate the overall dissipation. While the instantaneous vorticity field is dominated by a vortex gas, the time-averaged flow remains close to an ocean gyre predicted by laminar theory. This regime shows an unexpected role of two-dimensional turbulence in the organisation of oceanic flow.

Dates et versions

hal-04270349 , version 1 (04-11-2023)

Identifiants

Citer

Lennard Miller, Bruno Deremble, Antoine Venaille. Gyre Turbulence. 2023. ⟨hal-04270349⟩
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