Formation of spanwise vorticy in oblique turbulent bands of transitional plane Couette flow, part 1: Numerical experiments

Abstract : This article investigates the formation of spanwise vorticity in the velocity streaks of the oblique laminar-turbulent bands of plane Couette flow (PCF) by mean of Direct Numerical Simulations (DNS). The spanwise vorticity is created by a roll–up type development of the streamwise-wall normal shear layer of the velocity streaks. It is advected by the large scale flow along the bands. We propose a criterion on spanwise vorticity which detects these events in order to perform systematic measurements. Beside of the streamwise and spanwise correlation lengths of the rolls, their advection velocity is measured and shown to match the large scale flow along the band near the turbulent region. Eventually, we discuss the possible relation between ejection of vorticity away from the bands near the laminar region and the size of said laminar region.
Liste complète des métadonnées

Littérature citée [32 références]  Voir  Masquer  Télécharger

https://hal-polytechnique.archives-ouvertes.fr/hal-01092448
Contributeur : Joran Rolland <>
Soumis le : lundi 8 décembre 2014 - 16:55:17
Dernière modification le : jeudi 10 mai 2018 - 02:02:50
Document(s) archivé(s) le : lundi 9 mars 2015 - 12:17:44

Fichier

isp1_.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Joran Rolland. Formation of spanwise vorticy in oblique turbulent bands of transitional plane Couette flow, part 1: Numerical experiments. European Journal of Mechanics - B/Fluids, Elsevier, 2014, 50C, pp.52. 〈http://www.sciencedirect.com/science/article/pii/S0997754614001599〉. 〈10.1016/j.euromechflu.2014.11.007〉. 〈hal-01092448〉

Partager

Métriques

Consultations de la notice

145

Téléchargements de fichiers

73