Supertransient magnetohydrodynamic turbulence in Keplerian shear flows.
A subcritical transition to turbulence in magnetized Keplerian shear flows is investigated by using a statistical approach. Three-dimensional numerical simulations of the shearing box equations with zero net magnetic flux are employed to determine the transition from decaying to sustained turbulence as a function of the magnetic Reynolds number R{m}. The results reveal no clear transition to sustained turbulence as the average lifetime of the transients grows as an exponential function of R{m}, in accordance with a type-II supertransient law.
Rempel
Erico L
EL
Institute of Aeronautical Technology (IEFM/ITA), World Institute for Space Environment Research (WISER), São José dos Campos-SP 12228-900, Brazil. rempel@ita.br
Lesur
Geoffroy
G
Proctor
Michael R E
MR