EDP Sciences
Free access
Issue A&A
Volume 487, Number 1, August III 2008
Page(s) 1 - 5
Section Astrophysical processes
DOI http://dx.doi.org/10.1051/0004-6361:200809730
Published online 09 June 2008

A&A 487, 1-5 (2008)
DOI: 10.1051/0004-6361:200809730

Aspect ratio dependence in magnetorotational instability shearing box simulations

G. Bodo1, A. Mignone1, 2, F. Cattaneo3, P. Rossi1, and A. Ferrari2, 3

1  INAF, Osservatorio Astronomico di Torino, Strada Osservatorio 20, Pino Torinese, Italy
    e-mail: bodo@to.astro.it
2  Dipartimento di Fisica Generale, Universitá di Torino, via Pietro Giuria 1, 10125 Torino, Italy
3  Department of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis ave., Chicago IL 60637, USA

Received 6 March 2008 / Accepted 9 May 2008

Aims. We study the changes in the properties of turbulence driven by the magnetorotational instability in a shearing box, as the computational domain size in the radial direction is varied relative to the height.
Methods. We perform 3D simulations in the shearing box approximation, with a net magnetic flux, and we consider computational domains with different aspect ratios.
Results. We find that in boxes of aspect ratio unity the transport of angular momentum is strongly intermittent and dominated by channel solutions in agreement with previous work. In contrast, in boxes with larger aspect ratios, the channel solutions and the associated intermittent behavior disappear.
Conclusions. There is strong evidence that, as the aspect ratio becomes larger, the characteristics of the solution become aspect ratio independent. We conclude that shearing box calculations with an aspect ratio of unity or near unity may introduce spurious effects.

Key words: accretion, accretion disks -- instabilities -- turbulence -- magnetic fields -- magnetohydrodynamics (MHD)

© ESO 2008

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: N. Aghanim

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)