We examine the complex nonlinear flow-magnetic field dynamics in magnetohydrodynamic
(MHD) turbulence. Using direct numerical simulations (DNS), we investigate the dynamical
interactions subject to the influence of a uniform applied background magnetic field.
tial magnetic and kinetic Reynolds numbers (based on Taylor microscale) are 45 and
no initial magnetic field fluctuations. The sum total of turbulent magnetic and kinetic
decays monotonically. With time, the turbulent magnetic fluctuations grow by extracting
from velocity fluctuations. Expectedly, the distribution of energy between kinetic
fluctuations exhibits large periodic oscillations from the equipartition state due
to Alfven waves.
We perform a detailed analysis of the flow-magnetic field coupling and posit a simple
the energy interchange. Such dynamical analysis can provide the insight required for
control and closure modeling strategies.