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dc.contributor.authorHeld, LE
dc.contributor.authorLatter, Henrik
dc.date.accessioned2018-10-03T04:44:39Z
dc.date.available2018-10-03T04:44:39Z
dc.date.issued2018-11
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/283065
dc.description.abstractThe prevalence and consequences of convection perpendicular to the plane of accretion discs have been discussed for several decades. Recent simulations combining convection and the magnetorotational instability have given fresh impetus to the debate, as the interplay of the two processes can enhance angular momentum transport, at least in the optically thick outburst stage of dwarf novae. In this paper we seek to isolate and understand the most generic features of disc convection, and so undertake its study in purely hydrodynamical models. First, we investigate the linear phase of the instability, obtaining estimates of the growth rates both semi-analytically, using one-dimensional spectral computations, as well as analytically, using WKBJ methods. Next we perform three-dimensional, vertically stratified, shearing box simulations with the conservative, finite-volume code PLUTO, both with and without explicit diffusion coefficients. We find that hydrodynamic convection can, in general, drive outward angular momentum transport, a result that we confirm with ATHENA, an alternative finite-volume code. Moreover, we establish that the sign of the angular momentum flux is sensitive to the diffusivity of the numerical scheme. Finally, in sustained convection, whereby the system is continuously forced to an unstable state, we observe the formation of various coherent structures, including large- scale and oscillatory convective cells, zonal flows, and small vortices.
dc.publisherOxford University Press (OUP)
dc.titleHydrodynamic convection in accretion discs
dc.typeArticle
prism.endingPage4816
prism.issueIdentifier4
prism.publicationDate2018
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage4797
prism.volume480
dc.identifier.doi10.17863/CAM.30427
rioxxterms.versionofrecord10.1093/mnras/sty2097
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-01
dc.identifier.eissn1365-2966
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/sty2097
rioxxterms.typeJournal Article/Review
cam.issuedOnline2018-08-02
cam.orpheus.successThu Jan 30 10:54:21 GMT 2020 - The item has an open VoR version.
rioxxterms.freetoread.startdate2100-01-01


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