HAL : hal-00003337, version 3

arXiv : physics/0411213

DOI : 10.1063/1.2130745

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Physics of Fluids 17 (2005) 117104

Versions disponibles :

v1 (23-11-2004)

v2 (03-08-2005)

v3 (25-08-2005)

Towards an experimental von Karman dynamo: numerical studies for an optimized design

Florent Ravelet 1, Arnaud Chiffaudel 1, François Daviaud 1, Jacques Léorat 2

(15/11/2005)

Numerical studies of a kinematic dynamo based on von Karman type flows between two counterrotating disks in a finite cylinder are reported. The flow has been optimized using a water model experiment, varying the driving impellers configuration. A solution leading to dynamo action for the mean flow has been found. This solution may be achieved in VKS2, the new sodium experiment to be performed in Cadarache, France. The optimization process is described and discussed, then the effects of adding a stationary conducting layer around the flow on the threshold, on the shape of the neutral mode and on the magnetic energy balance are studied. Finally, the possible processes involved into kinematic dynamo action in a von Karman flow are reviewed and discussed. Among the possible processes we highlight the joint effect of the boundary-layer radial velocity shear and of the Ohmic dissipation localized at the flow/outer-shell boundary.

1 :	Service de physique de l'état condensé (SPEC)
	CNRS : URA2464 – CEA : DSM/IRAMIS
2 :	Laboratoire Univers et Théories (LUTH)
	CNRS : UMR8102 – INSU – Observatoire de Paris – Université Paris-Diderot - Paris VII

Domaine

:

Physique/Physique/Dynamique des Fluides

Mots Clés : dynamo – von karman – induction mechanisms – experimental dynamo

hal-00003337, version 3

http://hal.archives-ouvertes.fr/hal-00003337/fr/

oai:hal.archives-ouvertes.fr:hal-00003337_v3

Contributeur : Florent Ravelet <>

Soumis le : Jeudi 25 Août 2005, 14:59:14

Dernière modification le : Mardi 10 Juillet 2007, 10:12:42