Dynamo efficiency controlled by hydrodynamic bistability

被引：6

作者：

Miralles, Sophie ^{[1
,2
]}

Herault, Johann ^{[3
]}

Fauve, Stephan ^{[3
]}

Gissinger, Christophe ^{[3
]}

Petrelis, Francois ^{[3
]}

Daviaud, Francois ^{[4
,5
]}

Dubrulle, Berengere ^{[4
,5
]}

Boisson, Jean ^{[6
]}

Bourgoin, Mickael ^{[7
,8
]}

Verhille, Gautier ^{[9
,10
]}

Odier, Philippe ^{[1
,2
]}

Pinton, Jean-Francois ^{[1
,2
]}

Plihon, Nicolas ^{[1
,2
]}

机构：

[1] Ecole Normale Super Lyon, CNRS, Phys Lab, F-69364 Lyon 07, France

[2] Univ Lyon, F-69364 Lyon 07, France

[3] Univ Paris 06, Univ Paris Diderot, Ecole Normale Super, Lab Phys Stat,CNRS, Paris, France

[4] CNRS, Serv Phys Etat Condense, SPHYNX, F-91191 Gif Sur Yvette, France

[5] CEA Saclay, F-91191 Gif Sur Yvette, France

[6] ENSTA ParisTech, Unite Mecan Chaire AREVA, F-91762 Palaiseau, France

[7] CNRS, Lab Ecoulements Geophys & Ind, F-38041 Grenoble 9, France

[8] Univ Grenoble 1, F-38041 Grenoble 9, France

[9] CNRS, Inst Rech Phenomenes Hors Equilibre, F-13384 Marseille 13, France

[10] Univ Aix Marseille, F-13384 Marseille 13, France

来源：

PHYSICAL REVIEW E | 2014年 / 89卷 / 06期

关键词：

FLOW; STATIONARY; GENERATION; BEHAVIOR;

D O I：

10.1103/PhysRevE.89.063023

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Hydrodynamic and magnetic behaviors in a modified experimental setup of the von Karman sodium flow-where one disk has been replaced by a propeller-are investigated.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

引用

页数：5

共 37 条

[1] Heat transfer and large scale dynamics in turbulent Rayleigh-Benard convection
Ahlers, Guenter
Grossmann, Siegfried
Lohse, Detlef
[J]. REVIEWS OF MODERN PHYSICS, 2009, 81 (02) : 503 - 537
[2] Dynamo regimes and transitions in the VKS experiment
Berhanu, M.
Verhille, G.
Boisson, J.
Gallet, B.
Gissinger, C.
Fauve, S.
Mordant, N.
Petrelis, F.
Bourgoin, M.
Odier, P.
Pinton, J. -F.
Plihon, N.
Aumaitre, S.
Chiffaudel, A.
Daviaud, F.
Dubrulle, B.
Pirat, C.
[J]. EUROPEAN PHYSICAL JOURNAL B, 2010, 77 (04) : 459 - 468
[3] Bistability between a stationary and an oscillatory dynamo in a turbulent flow of liquid sodium
Berhanu, M.
Gallet, B.
Monchaux, R.
Bourgoin, M.
Odier, Ph.
Pinton, J. -F.
Plihon, N.
Volk, R.
Fauve, S.
Mordant, N.
Petrelis, F.
Aumaitre, S.
Chiffaudel, A.
Daviaud, F.
Dubrulle, B.
Ravelet, F.
[J]. JOURNAL OF FLUID MECHANICS, 2009, 641 : 217 - 226
[4] Symmetry and couplings in stationary Von Karman sodium dynamos
Boisson, J.
Aumaitre, S.
Bonnefoy, N.
Bourgoin, M.
Daviaud, F.
Dubrulle, B.
Odier, Ph
Pinton, J-F
Plihon, N.
Verhille, G.
[J]. NEW JOURNAL OF PHYSICS, 2012, 14
[5] CONTINUATION OR BREAKDOWN IN TORNADO-LIKE VORTICES
BURGGRAF, OR
FOSTER, MR
[J]. JOURNAL OF FLUID MECHANICS, 1977, 80 (MAY23) : 685 - &
[6] Numerical modelling of the geodynamo: a systematic parameter study
Christensen, U
Olson, P
Glatzmaier, GA
[J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 1999, 138 (02) : 393 - 409
[7] High Magnetic Shear Gain in a Liquid Sodium Stable Couette Flow Experiment: A Prelude to an α-Ω Dynamo
Colgate, Stirling A.
Beckley, Howard
Si, Jiahe
Martinic, Joe
Westpfahl, David
Slutz, James
Westrom, Cebastian
Klein, Brianna
Schendel, Paul
Scharle, Cletus
McKinney, Travis
Ginanni, Rocky
Bentley, Ian
Mickey, Timothy
Ferrel, Regnar
Li, Hui
Pariev, Vladimir
Finn, John
[J]. PHYSICAL REVIEW LETTERS, 2011, 106 (17)
[8] Normalized kinetic energy as a hydrodynamical global quantity for inhomogeneous anisotropic turbulence
Cortet, Pierre-Philippe
Diribarne, Pantxo
Monchaux, Romain
Chiffaudel, Arnaud
Daviaud, Francois
Dubrulle, Berengere
[J]. PHYSICS OF FLUIDS, 2009, 21 (02)
[9] Slow dynamics in a turbulent von karman swirling flow
de la Torre, A.
Burguete, J.
[J]. PHYSICAL REVIEW LETTERS, 2007, 99 (05)
[10] Bifurcations and dynamo action in a Taylor-Green flow
Dubrulle, B.
Blaineau, P.
Lopes, O. Mafra
Daviaud, F.
Laval, J-P
Dolganov, R.
[J]. NEW JOURNAL OF PHYSICS, 2007, 9

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