Dynamo efficiency controlled by hydrodynamic bistability

Sophie Miralles; Johann Hérault; Stephan Fauve; Christophe Gissinger; François Pétrélis; François Daviaud; Bérengère Dubrulle; Jean Boisson; Mickaël Bourgoin; Gautier Verhille; Philippe Odier; Jean François Pinton; Nicolas Plihon

doi:10.1103/PhysRevE.89.063023

Dynamo efficiency controlled by hydrodynamic bistability

Sophie Miralles
, Johann Hérault
, Stephan Fauve
, Christophe Gissinger
, François Pétrélis
, François Daviaud
, Bérengère Dubrulle
, Jean Boisson
, Mickaël Bourgoin
, Gautier Verhille
, Philippe Odier
, Jean François Pinton
, Nicolas Plihon

Research output: Contribution to journal › Article › peer-review

Abstract

Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Kármán sodium flow - where one disk has been replaced by a propeller - are investigated.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 field branches are investigated.

Original language	English
Article number	063023
Journal	Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume	89
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevE.89.063023
Publication status	Published - 30 Jun 2014
Externally published	Yes

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10.1103/PhysRevE.89.063023

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Miralles, S., Hérault, J., Fauve, S., Gissinger, C., Pétrélis, F., Daviaud, F., Dubrulle, B., Boisson, J., Bourgoin, M., Verhille, G., Odier, P., Pinton, J. F., & Plihon, N. (2014). Dynamo efficiency controlled by hydrodynamic bistability. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 89(6), Article 063023. https://doi.org/10.1103/PhysRevE.89.063023

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title = "Dynamo efficiency controlled by hydrodynamic bistability",

abstract = "Hydrodynamic and magnetic behaviors in a modified experimental setup of the von K{\'a}rm{\'a}n 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 field branches are investigated.",

author = "Sophie Miralles and Johann H{\'e}rault and Stephan Fauve and Christophe Gissinger and Fran{\c c}ois P{\'e}tr{\'e}lis and Fran{\c c}ois Daviaud and B{\'e}reng{\`e}re Dubrulle and Jean Boisson and Micka{\"e}l Bourgoin and Gautier Verhille and Philippe Odier and Pinton, \{Jean Fran{\c c}ois\} and Nicolas Plihon",

year = "2014",

month = jun,

day = "30",

doi = "10.1103/PhysRevE.89.063023",

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AU - Miralles, Sophie

AU - Hérault, Johann

AU - Fauve, Stephan

AU - Gissinger, Christophe

AU - Pétrélis, François

AU - Daviaud, François

AU - Dubrulle, Bérengère

AU - Boisson, Jean

AU - Bourgoin, Mickaël

AU - Verhille, Gautier

AU - Odier, Philippe

AU - Pinton, Jean François

AU - Plihon, Nicolas

PY - 2014/6/30

Y1 - 2014/6/30

N2 - Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Kármán 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 field branches are investigated.

AB - Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Kármán 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 field branches are investigated.

U2 - 10.1103/PhysRevE.89.063023

DO - 10.1103/PhysRevE.89.063023

M3 - Article

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AN - SCOPUS:84903650314

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VL - 89

JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

IS - 6

M1 - 063023

ER -

Dynamo efficiency controlled by hydrodynamic bistability

Abstract

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