Ensemble averaged high resolution direct numerical simulations of reverse spectral transfer are presented , extending on the many single realization numerical studies done up to now .
This identifies this type of spectral transfer as a statistical property of magnetohydrodynamic turbulence and thus permits reliable numerical exploration of its dynamics .
The magnetic energy decay exponent from these ensemble runs has been determined to be n _ { E } = ( 0.47 \pm 0.03 ) + ( 13.9 \pm 0.8 ) / R _ { \lambda } for initially helical magnetic fields .
We show for the first time that even after removing the Lorentz force term in the momentum equation , thus decoupling it from the induction equation , reverse spectral transfer still persists .
The induction equation is now linear with an externally imposed velocity field , thus amenable to numerous analysis techniques .
A new door has opened for analyzing reverse spectral transfer , with various ideas discussed . In Press Physical Review E Rapid Communication ( 2014 ) .