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  Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection

Käpylä, P. J., Gent, F. A., Olspert, N., Käpylä, M. J., & Brandenburg, A. (2020). Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection. Geophysical and Astrophysical Fluid Dynamics, 14(1-2), 8-34. doi:10.1080/03091929.2019.1571586.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-4728-E Version Permalink: http://hdl.handle.net/21.11116/0000-0006-4733-1
Genre: Journal Article

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Käpylä, P. J.1, Author
Gent, F. A., Author
Olspert, N., Author
Käpylä, Maarit J.1, Author              
Brandenburg, A., Author
Affiliations:
1Max Planck Research Group and ERC Consolidator Grant: Solar and Stellar Dynamos - SOLSTAR, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_2265638              

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Free keywords: Convection, turbulence, dynamos, magnetohydrodynamics
 Abstract: We test the sensitivity of hydrodynamic and magnetohydrodynamic turbulent convection simulations with respect to Mach number, thermal and magnetic boundary conditions, and the centrifugal force. We find that varying the luminosity, which also controls the Mach number, has only a minor effect on the large-scale dynamics. A similar conclusion can also be drawn from the comparison of two formulations of the lower magnetic boundary condition with either vanishing electric field or current density. The centrifugal force has an effect on the solutions, but only if its magnitude with respect to acceleration due to gravity is by two orders of magnitude greater than in the Sun. Finally, we find that the parameterisation of the photospheric physics, either by an explicit cooling term or enhanced radiative diffusion, is more important than the thermal boundary condition. In particular, runs with cooling tend to lead to more anisotropic convection and stronger deviations from the Taylor-Proudman state. In summary, the fully compressible approach taken here with the Pencil Code is found to be valid, while still allowing the disparate timescales to be taken into account.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1080/03091929.2019.1571586
 Degree: -

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Title: Geophysical and Astrophysical Fluid Dynamics
Source Genre: Journal
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Publ. Info: New York : Gordon and Breach Science Publishers.
Pages: - Volume / Issue: 14 (1-2) Sequence Number: - Start / End Page: 8 - 34 Identifier: ISSN: 0309-1929
CoNE: https://pure.mpg.de/cone/journals/resource/958480220815