Granular Rayleigh-Taylor instability - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2009

Granular Rayleigh-Taylor instability

Résumé

A granular instability driven by gravity is studied experimentally and numerically. The instability arises as grains fall in a closed Hele-Shaw cell where a layer of dense granular material is positioned above a layer of air. The initially flat front defined by the grains subsequently develops into a pattern of falling granu-lar fingers separated by rising bubbles of air. A transient coarsening of the front is observed right from the start by a finger merging process. The coarsening is later stabilized by new fingers growing from the center of the rising bubbles. The structures are quantified by means of Fourier analysis and quantitative agreement between experiment and computation is shown. This analysis also reveals scale invariance of the flow structures under overall change of spatial scale.
Fichier principal
Vignette du fichier
2007-VinninglandJohnsenFlekkoyToussaintMaloy-TGF07.pdf (556.02 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02378044 , version 1 (24-11-2019)

Identifiants

  • HAL Id : hal-02378044 , version 1

Citer

Jan Ludvig Vinningland, Øistein Johnsen, Eirik Grude Flekkøy, Renaud Toussaint, Knut J. Måløy. Granular Rayleigh-Taylor instability. Appert-Rolland, C., Chevoir, F., Gondret, P., Lassarre, S., Lebacque, J.-P., Schreckenberg, M. Traffic and Granular Flow ' 07, Springer, pp.577-586, 2009, 978-3-540-77074-9. ⟨hal-02378044⟩
7 Consultations
36 Téléchargements

Partager

Gmail Facebook X LinkedIn More