Large-scale fluctuations and dynamics of the Bullard-von Karman dynamo

被引:4
|
作者
Verhille, Gautier
Plihon, Nicolas [1 ]
Fanjat, Gregory
Volk, Romain
Bourgoin, Mickael
Pinton, Jean-Francois
机构
[1] Ecole Normale Super Lyon, Phys Lab, CNRS, F-69364 Lyon, France
来源
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS | 2010年 / 104卷 / 2-3期
关键词
Magnetohydrodynamics; Dynamo; Bifurcation; Turbulence; On-off intermittency; MAGNETIC-FIELDS; INTERMITTENCY; INDUCTION; NOISE;
D O I
10.1080/03091920903301938
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A synthetic fluid dynamo built in the spirit of the Bullard device (Bullard, The stability of a homopolar dynamo, Proc. Camb. Phil. Soc. 1955, 51, 744) is investigated. It is a two-step dynamo in which one process stems from the fluid turbulence, while the other part is achieved by a linear amplification of currents in external coils (Bourgoin et al., A bullard-von Karman dynamo, New J. Phys., 2006, 8, 329). Modifications in the forcing are introduced in order to change the dynamics of the flow, and hence the dynamo behavior. Some features, such as on-off intermittency at onset of dynamo action, are very robust. Large-scale fluctuations have a significant impact on the resulting dynamo, in particular in the observation of magnetic field reversals.
引用
收藏
页码:189 / 205
页数:17
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