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Effects of stratification in spherical shell convection
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
2011 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 332, 883Article in journal (Refereed) Published
Abstract [en]

We report on simulations of mildly turbulent convection in spherical wedge geometry with varying density stratification. We vary the density contrast within the convection zone by a factor of 20 and study the influence of rotation on the solutions. We demonstrate that the size of convective cells decreases and the anisotropy of turbulence increases as the stratification is increased. Differential rotation is found to change from anti-solar (slow equator) to solar-like (fast equator) at roughly the same Coriolis number for all stratifications. The largest stratification runs, however, are sensitive to changes of the Reynolds number. Evidence for a near-surface shear layer is found in runs with strong stratification and large Reynolds numbers.

Place, publisher, year, edition, pages
2011. Vol. 332, 883
Keyword [en]
convection, hydrodynamics, methods: numerical, Sun: rotation, stars: rotation, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-70039DOI: 10.1002/asna.201111619ISI: 000297949100006OAI: oai:DiVA.org:su-70039DiVA: diva2:478722
Note

authorCount :3

Available from: 2012-01-16 Created: 2012-01-16 Last updated: 2017-12-08Bibliographically approved

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Brandenburg, Axel
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Department of AstronomyNordic Institute for Theoretical Physics (Nordita)
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