Eulerian vs Lagrangian Irreversibility in an experimental turbulent swirling flow - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2022

Eulerian vs Lagrangian Irreversibility in an experimental turbulent swirling flow

Abstract

In a turbulent fluid, the time-reversal symmetry is explicitly broken by viscosity, and spontaneously broken in the inviscid limit. Recently, Drivas proved the equivalence of two different local indicators of time-irreversibility: i) an Eulerian one, based on regularity properties of the velocity field ii) a Lagrangian one, based on symmetry properties of the trajectories under time reversal. We test this equivalence in a turbulent Von Kármán experiment at a resolution of the order of the Kolmogorov scale using a high resolution 4D-PTV technique. We use the equivalence to perform the first joined Eulerian-Lagrangian exploration of the dynamics leading to time irreversibility, and find that it is linked with vortex interaction, suggesting a link between irreversibility and singularity.
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Dates and versions

hal-03765230 , version 1 (31-08-2022)

Identifiers

  • HAL Id : hal-03765230 , version 1

Cite

Adam Cheminet, Damien Geneste, Antoine Barlet, Yasar Ostovan, Tarek Chaabo, et al.. Eulerian vs Lagrangian Irreversibility in an experimental turbulent swirling flow. Physical Review Letters, In press. ⟨hal-03765230⟩
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