The illusion of a Kolmogorov cascade - Complexe de recherche interprofessionnel en aerothermochimie Accéder directement au contenu
Article Dans Une Revue Journal of Fluid Mechanics Année : 2020

The illusion of a Kolmogorov cascade

Résumé

The theory of Kolmogorov, enunciated for very large Reynolds numbers, has progressively been shown to be inoperative for characterizing flows of practical relevance. Yet, in a recent study by Alves Portela et al. (2020), the turbulence statistics in the very near wake of a square prism at modest Reynolds numbers, reveal a significant portion of scales complying with a cascade of Kolmogorov-type. By resorting to a generalized version of the Kármán-Howarth-Kolmogorov equation, this intriguing observation is shown to be an illusion, hiding a measurable influence of coherent structures and statistical inhomogeneity. This striking conclusion highlights that a complete statistical theory of turbulence cannot dispense with the influence of large scales, possibly coherent, motions.
Fichier principal
Vignette du fichier
FOF_Thiesset_Danaila_200712.pdf (158.21 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02929162 , version 1 (03-09-2020)

Identifiants

Citer

F. Thiesset, L. Danaila. The illusion of a Kolmogorov cascade. Journal of Fluid Mechanics, 2020, 902, pp.F1. ⟨10.1017/jfm.2020.594⟩. ⟨hal-02929162⟩
147 Consultations
153 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More