The VKS experiment: turbulent dynamical dynamos

Sébastien Aumaître; Michael Berhanu; Mickael Bourgoin; Arnaud Chiffaudel; François Daviaud; Bérengère Dubrulle; Stephan Fauve; Louis Marié; Romain Monchaux; Nicolas Mordant; Philippe Odier; François Pétrélis; Jean François Pinton; Nicolas Plihon; Florent Ravelet; Romain Volk

doi:10.1016/j.crhy.2008.07.002

The VKS experiment: turbulent dynamical dynamos

Sébastien Aumaître, Michael Berhanu, Mickael Bourgoin, Arnaud Chiffaudel, François Daviaud, Bérengère Dubrulle, Stephan Fauve, Louis Marié, Romain Monchaux, Nicolas Mordant, Philippe Odier, François Pétrélis, Jean François Pinton, Nicolas Plihon, Florent Ravelet, Romain Volk

Research output: Contribution to journal › Short survey › peer-review

Abstract

The VKS experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von Kármán geometry). We report observations related to the self-generation of a stationary dynamo when the flow forcing is symmetric, i.e. when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical, with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is asymmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow. To cite this article: VKS Collaboration, C. R. Physique 9 (2008).

Original language	English
Pages (from-to)	689-701
Number of pages	13
Journal	Comptes Rendus Physique
Volume	9
Issue number	7
DOIs	https://doi.org/10.1016/j.crhy.2008.07.002
Publication status	Published - 1 Jan 2008
Externally published	Yes

Keywords

Dynamo
Magnetohydrodynamics
Turbulence

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10.1016/j.crhy.2008.07.002

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title = "The VKS experiment: turbulent dynamical dynamos",

abstract = "The VKS experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von K{\'a}rm{\'a}n geometry). We report observations related to the self-generation of a stationary dynamo when the flow forcing is symmetric, i.e. when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical, with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is asymmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow. To cite this article: VKS Collaboration, C. R. Physique 9 (2008).",

keywords = "Dynamo, Magnetohydrodynamics, Turbulence",

author = "S{\'e}bastien Auma{\^i}tre and Michael Berhanu and Mickael Bourgoin and Arnaud Chiffaudel and Fran{\c c}ois Daviaud and B{\'e}reng{\`e}re Dubrulle and Stephan Fauve and Louis Mari{\'e} and Romain Monchaux and Nicolas Mordant and Philippe Odier and Fran{\c c}ois P{\'e}tr{\'e}lis and Pinton, \{Jean Fran{\c c}ois\} and Nicolas Plihon and Florent Ravelet and Romain Volk",

year = "2008",

month = jan,

day = "1",

doi = "10.1016/j.crhy.2008.07.002",

language = "English",

volume = "9",

pages = "689--701",

journal = "Comptes Rendus Physique",

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TY - JOUR

T1 - The VKS experiment

T2 - turbulent dynamical dynamos

AU - Aumaître, Sébastien

AU - Berhanu, Michael

AU - Bourgoin, Mickael

AU - Chiffaudel, Arnaud

AU - Daviaud, François

AU - Dubrulle, Bérengère

AU - Fauve, Stephan

AU - Marié, Louis

AU - Monchaux, Romain

AU - Mordant, Nicolas

AU - Odier, Philippe

AU - Pétrélis, François

AU - Pinton, Jean François

AU - Plihon, Nicolas

AU - Ravelet, Florent

AU - Volk, Romain

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The VKS experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von Kármán geometry). We report observations related to the self-generation of a stationary dynamo when the flow forcing is symmetric, i.e. when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical, with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is asymmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow. To cite this article: VKS Collaboration, C. R. Physique 9 (2008).

AB - The VKS experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von Kármán geometry). We report observations related to the self-generation of a stationary dynamo when the flow forcing is symmetric, i.e. when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical, with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is asymmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow. To cite this article: VKS Collaboration, C. R. Physique 9 (2008).

KW - Dynamo

KW - Magnetohydrodynamics

KW - Turbulence

U2 - 10.1016/j.crhy.2008.07.002

DO - 10.1016/j.crhy.2008.07.002

M3 - Short survey

AN - SCOPUS:52749096904

SN - 1631-0705

VL - 9

SP - 689

EP - 701

JO - Comptes Rendus Physique

JF - Comptes Rendus Physique

IS - 7

ER -

The VKS experiment: turbulent dynamical dynamos

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Keywords

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