Using direct numerical simulations of three-dimensional isotropic Magnetohydrodynamics, the scaling properties of two-point and two-time correlations are investigated. A large scale forcing is imposed and, when a turbulent steady state is reached, the dominant processes in the time decorrelation of the small-scale fluctuations are studied. In particular, the role of the sweeping, due to the motion of large scale eddies, is investigated. Results are also compared with previous studies in hydrodynamics. A possible link between spatial intermittency and bursty Eulerian signals is considered as well.
Space-time statistics of isotropic MHD turbulence: the role of the sweeping effect
SERVIDIO, SERGIO;CARBONE, Vincenzo;
2010-01-01
Abstract
Using direct numerical simulations of three-dimensional isotropic Magnetohydrodynamics, the scaling properties of two-point and two-time correlations are investigated. A large scale forcing is imposed and, when a turbulent steady state is reached, the dominant processes in the time decorrelation of the small-scale fluctuations are studied. In particular, the role of the sweeping, due to the motion of large scale eddies, is investigated. Results are also compared with previous studies in hydrodynamics. A possible link between spatial intermittency and bursty Eulerian signals is considered as well.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.