Noise-sustained convective instability in a magnetized Taylor-Couette flow

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The helical magnetorotational instability of the magnetized Taylor-Couette flow is studied numerically in a finite cylinder. A distant upstream insulating boundary is shown to stabilize the convective instability entirely while reducing the growth rate of the absolute instability. The reduction is less severe with greater height. After we model the boundary conditions properly, the wave patterns observed in the experiment turn out to be a noise-sustained convective instability. After the source of the noise resulting from unstable Ekman and Stewartson layers is switched off, a slowly decaying inertial oscillation is observed in the simulation. We reach the conclusion that the experiments completed to date have not yet reached the regime of absolute instability.

Original languageEnglish (US)
Pages (from-to)998-1003
Number of pages6
JournalAstrophysical Journal
Volume692
Issue number2
DOIs
StatePublished - Feb 20 2009

Keywords

  • Accretion, accretion disks
  • Instabilities
  • MHD
  • Methods: numerical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Noise-sustained convective instability in a magnetized Taylor-Couette flow'. Together they form a unique fingerprint.

Cite this