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

Details Large scale fluctuations and dynamics of the Bullard - von Kármán dynamo Large scale fluctuations and dynamics of the Bullard - von Kármán dynamo

2009-06-15

arxiv.org/abs/0906.2719v1

Physics

Fluid Dynamics

Scientific paper

A synthetic fluid dynamo built in the spirit of the Bullard device [E. C. Bullard, Proc. Camb. Phil. Soc., 51, 744 (1955)] is investigated. It is a two-step dynamo in which one process stems from the fluid turbulence, while the other part is an alpha effect achieved by a linear amplification of currents in external coils [M. Bourgoin et al., New J. Phys., 8, 329 (2006)]. 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 scales fluctuations have a significant impact on the resulting dynamo, in particular in the observation of magnetic field reversals.

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