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Sensitivity to lumi...
Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection
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- Käpylä, Petri (författare)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Georg-August-Universität Göttingen, Germany; Leibniz-Institut für Astrophysik, Germany; ReSoLVE Centre of Excellence, Finland; Max-Planck-Institut für Sonnensystemforschung, Germany,Georg August Univ Gottingen, Inst Astrophys, Gottingen, Germany.;Leibniz Inst Astrophys, Potsdam, Germany.;ReSoLVE Ctr Excellence, Dept Comp Sci, Aalto, Finland.;Max Planck Inst Sonnensyst Forsch, Gottingen, Germany.;KTH Royal Inst Technol, NORDITA, Stockholm, Sweden.;Stockholm Univ, Stockholm, Sweden.
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- Gent, F. A. (författare)
- ReSoLVE Ctr Excellence, Dept Comp Sci, Aalto, Finland.
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- Olspert, N. (författare)
- ReSoLVE Ctr Excellence, Dept Comp Sci, Aalto, Finland.
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- Kaepylae, M. J. (författare)
- ReSoLVE Ctr Excellence, Dept Comp Sci, Aalto, Finland.;Max Planck Inst Sonnensyst Forsch, Gottingen, Germany.
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- Brandenburg, Axel (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, Stockholm, Sweden.;Univ Colorado, JILA, Boulder, CO 80309 USA.;Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Lab Atmospher & Space Phys, Boulder, CO USA.,Nordiska institutet för teoretisk fysik (Nordita),Institutionen för astronomi,University of Colorado, USA; Laboratory for Atmospheric and Space Physics, Boulder, USA
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(creator_code:org_t)
- 2019-02-15
- 2020
- Engelska.
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Ingår i: Geophysical and Astrophysical Fluid Dynamics. - : Taylor & Francis. - 0309-1929 .- 1029-0419. ; 114:1-2, s. 8-34
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Nyckelord
- Convection
- turbulence
- dynamos
- magnetohydrodynamics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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