Disentangling inertial waves from eddy turbulence in a forced rotating-turbulence experiment - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue Physical Review E Année : 2015

Disentangling inertial waves from eddy turbulence in a forced rotating-turbulence experiment

Résumé

We present a spatiotemporal analysis of a statistically stationary rotating-turbulence experiment, aiming to extract a signature of inertial waves and to determine the scales and frequencies at which they can be detected. The analysis uses two-point spatial correlations of the temporal Fourier transform of velocity fields obtained from time-resolved stereoscopic particle image velocimetry measurements in the rotating frame. We quantify the degree of anisotropy of turbulence as a function of frequency and spatial scale. We show that this space-time-dependent anisotropy is well described by the dispersion relation of linear inertial waves at large scale, while smaller scales are dominated by the sweeping of the waves by fluid motion at larger scales. This sweeping effect is mostly due to the low-frequency quasi-two-dimensional component of the turbulent flow, a prominent feature of our experiment that is not accounted for by wave-turbulence theory. These results question the relevance of this theory for rotating turbulence at the moderate Rossby numbers accessible in laboratory experiments, which are relevant to most geophysical and astrophysical flows.
Fichier principal
Vignette du fichier
2015_campagne_disentangling_inertial_waves_from_eddy_turbulence_in_a_forced_rotating-turbulence_experiment.pdf (477.83 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

cea-01366748 , version 1 (15-09-2016)

Identifiants

Citer

Antoine Campagne, Basile Gallet, Frederic Moisy, Pierre-Philippe Cortet. Disentangling inertial waves from eddy turbulence in a forced rotating-turbulence experiment. Physical Review E , 2015, 91, pp.043016. ⟨10.1103/PhysRevE.91.043016⟩. ⟨cea-01366748⟩
256 Consultations
257 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More