A comparison of local simulations and reduced models of MRI-induced turbulence

Details A comparison of local simulations and reduced models of MRI-induced turbulence A comparison of local simulations and reduced models of MRI-induced turbulence

2009-04-21

arxiv.org/abs/0904.3190v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

MNRAS accepted, 9 pages, 11 figures

Scientific paper

We run mean-field shearing-box numerical simulations with a temperature-dependent resistivity and compare them to a reduced dynamical model. Our simulations reveal the co-existence of two quasi-steady states, a `quiet' state and an `active' turbulent state, confirming the predictions of the reduced model. The initial conditions determine on which state the simulation ultimately settles. The active state is strongly influenced by the geometry of the computational box and the thermal properties of the gas. Cubic domains support permanent channel flows, bar-shaped domains exhibit eruptive behaviour, and horizontal slabs give rise to infrequent channels. Meanwhile, longer cooling time-scales lead to higher saturation amplitudes.

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