Dynamo Efficiency Controlled by Hydro- dynamic Bistability - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2014

Dynamo Efficiency Controlled by Hydro- dynamic Bistability

Sophie Miralles
François Daviaud
  • Fonction : Auteur
  • PersonId : 829347
Jean Boisson
Nicolas Plihon

Résumé

Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Karman sodium flow - where one disk has been replaced by a propeller - are investigated.When the rotation frequencies of the disk and the propeller are different, we show that the fully turbulent hydrodynamic flow undergoes a global bifurcation between two configurations. The bistability of these flow configurations is associated with the dynamics of the central shear layer. The bistable flows are shown to have different dynamo efficiencies; thus for a given rotation rate of the soft-iron disk, two distinct magnetic behaviors are observed depending on the flow configuration. The hydrodynamic transition controls the magnetic field behavior, and bifurcations between high and low magnetic
Fichier principal
Vignette du fichier
Miralles_PRE_89.pdf (801.8 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01079011 , version 1 (13-04-2015)

Identifiants

Citer

Sophie Miralles, Johann Hérault, Stéphan Fauve, Christophe Gissinger, François Pétrélis, et al.. Dynamo Efficiency Controlled by Hydro- dynamic Bistability. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2014, 89, pp.063023. ⟨10.1103/PhysRevE.89.063023⟩. ⟨hal-01079011⟩
460 Consultations
446 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More