Supertransient magnetohydrodynamic turbulence in Keplerian shear flows

Details Supertransient magnetohydrodynamic turbulence in Keplerian shear flows Supertransient magnetohydrodynamic turbulence in Keplerian shear flows

2010-06-29

arxiv.org/abs/1006.5669v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 5 figures, accepted for publication in Physical Review Letters

Scientific paper

A subcritical transition to turbulence in magnetized Keplerian shear flows is investigated 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 Rm. The results reveal no clear transition to sustained turbulence as the average lifetime of the transients grows as an exponential function of Rm, in accordance with a type-II supertransient law.

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