Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9..298a&link_type=abstract
New Journal of Physics, Volume 9, Issue 8, pp. 298 (2007).
Physics
12
Scientific paper
The nature of the interactions between different scales in magneto-hydrodynamic (MHD) turbulence is important for the understanding of the behaviour of magnetized astrophysical, geophysical and industrial flows in a turbulent state. In this paper, we review some recent results in the study of locality of interactions in turbulent flows and we address some of the questions that arise. We examine the cascade of ideal invariants in turbulent MHD flows by examining the transfer functions. We show new results indicating that the nonlocal behaviour of the energy transfer in MHD is the result of a correlation between the velocity and magnetic fields. This nonlocality disappears if we randomize the phases of the two fields keeping the hydrodynamic and magnetic helicities fixed. The cascade of magnetic helicity is also investigated, with special focus on the fate of the small-scale helicity and its coupling with the large-scale flow. These results have implications for dynamo action, in particular for the commonly used distinction between large- and small-scale dynamos. The long-range interactions that exist in MHD flows also raise the question of the existence of universality in MHD, both in the kinematic dynamo regime as well as in the turbulent steady state.
Alexakis Alexandros
Mininni Pablo Daniel
Pouquet Annick
No associations
LandOfFree
Turbulent cascades, transfer, and scale interactions in magnetohydrodynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Turbulent cascades, transfer, and scale interactions in magnetohydrodynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Turbulent cascades, transfer, and scale interactions in magnetohydrodynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1796611