laboratoire de physique statistique
 
 
laboratoire de physique statistique

Publications

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GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS 


2
P U B L I C A T I O N S

S E L E C T I O N N E R
P A R M I :



 
2012
Reversals of a large-scale field generated over a turbulent background - Gallet, B. and Herault, J. and Laroche, C. and Petrelis, F. and Fauve, S.
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS 106468-492 (2012)

Abstract : We present a study of several systems in which a large-scale field is generated over a turbulent background. These large-scale fields break a symmetry of the forcing by selecting a direction. Under certain conditions, the large-scale field displays reversals so that the symmetry of the forcing is recovered statistically. We present examples of such dynamics in the context of the dynamo instability, of two-dimensional turbulent Kolmogorov flows and of turbulent Rayleigh-Benard convection. In these systems reversals occur respectively for the dynamo magnetic field, for the large-scale circulation generated by a periodic forcing in space and for the large-scale roll generated by turbulent thermal convection. We compare the mechanisms involved and show that their properties depend on some symmetries of the system and on the way they are broken.
 
2007
On the magnetic fields generated by experimental dynamos - Petrelis, F. and Mordant, N. and Fauve, S.
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS 101289-323 (2007)

Abstract : We review the results obtained by three successful fluid dynamo experiments and discuss what has been learnt from them about the effect of turbulence on the dynamo threshold and saturation. We then discuss several questions that are still open and propose experiments that could be performed to answer some of them.