Shear-layer instability in a rotating system - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Flow Visualization and Image Processing Année : 2007

Shear-layer instability in a rotating system

Résumé

The shear-layer instability in the flow over a rotating disk with a free surface is investigated experimentally by flow visualizations for a large range of the flow control parameters: the aspect ratio G of the cavity, the rotationnal Reynolds number Re and the radius ratio s between the inner and outer radii of the rotating disk. This instability develops along the cylindrical shroud as sharp-cornered polygonal patterns characterized by the number of vortices m. This number m can be scaled by considering an Ekman number based on the water depth, which confirms that the shroud boundary layer is of Stewartson type. The appearance threshold of the first polygonal mode is constant by considering the mixed Reynolds number introduced by Niino and Misawa (1984) based on both the water depth at rest and the rotating disk radius. For large values of s, the instability patterns appear along the hub as small stationary cells.
Fichier principal
Vignette du fichier
JFVIP_poncet.pdf (1.58 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00085998 , version 1 (06-09-2007)

Identifiants

  • HAL Id : hal-00085998 , version 1

Citer

Sébastien Poncet, Marie-Pierre Chauve. Shear-layer instability in a rotating system. Journal of Flow Visualization and Image Processing, 2007, 14 (1), pp.85-105. ⟨hal-00085998⟩
60 Consultations
471 Téléchargements

Partager

Gmail Facebook X LinkedIn More