Vous êtes ici

Two-dimensional state in driven magnetohydrodynamic turbulence

TitreTwo-dimensional state in driven magnetohydrodynamic turbulence
Type de publicationJournal Article
Year of Publication2011
AuteursBigot, B, Galtier, S
JournalPhysical Review EPhysical Review E
Date PublishedFeb
ISBN Number1539-3755
Numéro d'accèsWOS:000287488500003

The dynamics of the two-dimensional (2D) state in driven three-dimensional (3D) incompressible magnetohydrodynamic turbulence is investigated through high-resolution direct numerical simulations and in the presence of an external magnetic field at various intensities. For such a flow the 2D state (or slow mode) and the 3D modes correspond, respectively, to spectral fluctuations in the plane k(parallel to) = 0 and in the area k(parallel to) > 0. It is shown that if initially the 2D state is set to zero it becomes nonnegligible in few turnover times, particularly when the external magnetic field is strong. The maintenance of a large-scale driving leads to a break for the energy spectra of 3D modes; when the driving is stopped, the previous break is removed and a decay phase emerges with Alfvenic fluctuations. For a strong external magnetic field the energy at large perpendicular scales lies mainly in the 2D state, and in all situations a pinning effect is observed at small scales.

Equipes concernées: 
S'abonner à Syndiquer