Friday, November 9, 2012

1211.1910 (Z. Bradshaw et al.)

Energy-Level Cascades in Physical Scales of 3D Incompressible
Magnetohydrodynamic Turbulence

Z. Bradshaw, Z. Grujić
The total energy in 3D MHD turbulence is shown to cascade over an inertial range the lower limit of which is a modified Taylor length scale. Direct cascades are also investigated for energies transported by distinct mechanisms which together comprise the total energy. These include the convection of total fluid energy by the velocity field, the kinetic to kinetic energy transfer advected by the velocity field, and the magnetic to magnetic energy transfer advected by the velocity field. Flux locality for the cascading quantities is also addressed. A scenario in which the inter-medium energy transfer is predominantly from kinetic to magnetic and a note regarding the cascade of kinetic energy for non-decaying fluid turbulence are included.
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