– Niels Bohr Institute - University of Copenhagen

Shearing box simulations in the Rayleigh unstable regime

Research output: Contribution to journalJournal articleResearchpeer-review

Farrukh Nauman, Eric G. Blackman

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 languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume467
Issue number2
Pages (from-to)1652-1660
ISSN0035-8711
DOIs
StatePublished - 1 May 2017

    Research areas

  • Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics

ID: 166633220