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  The stress-pressure lag in MRI turbulence and its implications for thermal instability in accretion discs

Held, L. E., & Latter, H. N. (2022). The stress-pressure lag in MRI turbulence and its implications for thermal instability in accretion discs. Monthly Notices of the Royal Astronomical Society, 510(1), 146-153. doi:10.1093/mnras/stab3398.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-BD57-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0009-C10D-F
Genre: Journal Article

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 Creators:
Held, Loren E.1, Author           
Latter , Henrik N., Author
Affiliations:
1Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR, Physics, Fluid Dynamics, physics.flu-dyn
 Abstract: The classical alpha-disc model assumes that the turbulent stress scales
linearly with -- and responds instantaneously to -- the pressure. It is likely,
however, that the stress possesses a non-negligible relaxation time and will
lag behind the pressure on some timescale. To measure the size of this lag we
carry out unstratified 3D magnetohydrodynamic shearing box simulations with
zero-net-magnetic-flux using the finite-volume code PLUTO. We impose thermal
oscillations of varying periods via a cooling term, which in turn drives
oscillations in the turbulent stress. Our simulations reveal that the stress
oscillations lag behind the pressure by $\sim 5$ orbits in cases where the
oscillation period is several tens of orbits or more. We discuss the
implication of our results for thermal and viscous overstability in discs
around compact objects.

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 Dates: 2021-11-222022
 Publication Status: Issued
 Pages: Accepted for publication in MNRAS (8 pages, 7 figures)
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2111.11226
DOI: 10.1093/mnras/stab3398
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 510 (1) Sequence Number: - Start / End Page: 146 - 153 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150