Shearing box simulations in the Rayleigh unstable regime
Research output: Contribution to journal › Journal article › Research › peer-review
We study the stability properties of Rayleigh unstable flows both in the
purely hydrodynamic and magnetohydrodynamic (MHD) regimes for two
different values of the shear $q=2.1, 4.2$ ($q = - d\ln\Omega / d\ln r$)
and compare it with the Keplerian case $q=1.5$. The Rayleigh stability
criterion states that hydrodynamic shear flows are stable for $q2$ regime as the volume
averaged velocities ($k=0$ mode) are unstable in this regime but the
advantage of using a pseudospectral code is that the $k=0$ mode is
conserved. We find that the $q>2$ regime is unstable to turbulence
both in the hydrodynamic and in the MHD limit (with an initially weak
magnetic field). In the $q>2$ regime, the velocity fluctuations
dominate the magnetic fluctuations whereas in the $q2$ regime the instability produces primarily velocity fluctuations
that cause magnetic fluctuations, with the causality reversed for the
$q
Original language | English |
---|---|
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 467 |
Issue number | 2 |
Pages (from-to) | 1652-1660 |
ISSN | 0035-8711 |
DOIs | |
Publication status | Published - 1 May 2017 |
- Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics
Research areas
Links
- http://arxiv.org/pdf/1507.04711
Submitted manuscript
ID: 166633220