par Domaradzki, Julian Andrzej ;Teaca, Bogdan ;Carati, Daniele
Référence Physics of fluids, 22, 5, page (1-4), 021005PHF
Publication Publié, 2010-05
Article révisé par les pairs
Résumé : The scale locality functions, originally introduced by Kraichnan for hydrodynamic turbulence, are computed from results of direct numerical simulations of forced magnetohydrodynamic turbulence. It is found that asymptotically the dynamics is dominated by local interactions, but the locality is much weaker than in hydrodynamic turbulence, which is characterized by the scaling exponent of 4/3. Specifically, in magnetohydrodynamic turbulence, two distinct exponents are observed, 1/3 and 2/3. Despite that, direct numerical simulation results reported in this paper exhibit strong coupling between large scales from the forcing band and smallest resolved scales because the locality is too weak to achieve decoupling for the numerical resolution available. © 2010 American Institute of Physics.