Dependence of the large-scale vortex instability on latitude, stratification and domain size

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dc.contributor University of Helsinki, Department of Astronomy (-2009) en
dc.contributor University of Helsinki, Department of Astronomy (-2009) en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author J. Mantere, Maarit
dc.contributor.author J. Käpylä, Petri
dc.contributor.author Hackman, Thomas
dc.date.accessioned 2012-01-16T10:30:01Z
dc.date.available 2012-01-16T10:30:01Z
dc.date.issued 2011
dc.identifier.citation J. Mantere , M , J. Käpylä , P & Hackman , T 2011 , ' Dependence of the large-scale vortex instability on latitude, stratification and domain size ' Astronomische Nachrichten , vol. 332 , no. 9/10 , pp. 876 – 882 . DOI: 10.1002/asna.201111620 en
dc.identifier.issn 0004-6337
dc.identifier.other PURE: 20206714
dc.identifier.other PURE UUID: 9ad30232-9049-408f-841d-4d7a730e5b8b
dc.identifier.other ArXiv: http://arxiv.org/abs/1109.4317v2
dc.identifier.other WOS: 000297949100005
dc.identifier.other Scopus: 83455234922
dc.identifier.uri http://hdl.handle.net/10138/29166
dc.description.abstract In an earlier study, we reported on the excitation of large-scale vortices in Cartesian hydrodynamical convection models subject to rapid enough rotation. In that study, the conditions for the onset of the instability were investigated in terms of the Reynolds (Re) and Coriolis (Co) numbers in models located at the stellar North pole. In this study, we extend our investigation to varying domain sizes, increasing stratification, and place the box at different latitudes. The effect of the increasing box size is to increase the sizes of the generated structures, so that the principal vortex always fills roughly half of the computational domain. The instability becomes stronger in the sense that the temperature anomaly and change in the radial velocity are observed to be enhanced. The model with the smallest box size is found to be stable against the instability, suggesting that a sufficient scale separation between the convective eddies and the scale of the domain is required for the instability to work. The instability can be seen upto the colatitude of 30 degrees, above which value the flow becomes dominated by other types of mean flows. The instability can also be seen in a model with larger stratification. Unlike the weakly stratified cases, the temperature anomaly caused by the vortex structures is seen to depend on depth. en
dc.format.extent 7
dc.language.iso eng
dc.relation.ispartof Astronomische Nachrichten
dc.rights en
dc.subject astro-ph.SR en
dc.subject 115 Astronomy, Space science en
dc.title Dependence of the large-scale vortex instability on latitude, stratification and domain size en
dc.title.alternative Dependence of the large-scale vortex instability on latitude, stratification and domain size en
dc.type Article
dc.identifier.doi https://doi.org/10.1002/asna.201111620
dc.type.uri info:eu-repo/semantics/other
dc.contributor.pbl

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