Shearing box simulations in the Rayleigh unstable regime
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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
Originalsprog | Engelsk |
---|---|
Tidsskrift | Monthly Notices of the Royal Astronomical Society |
Vol/bind | 467 |
Udgave nummer | 2 |
Sider (fra-til) | 1652-1660 |
ISSN | 0035-8711 |
DOI | |
Status | Udgivet - 1 maj 2017 |
Links
- http://arxiv.org/pdf/1507.04711
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