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Abstract
The radial gradient of the rotation rate in the nearsurface shear layer
(NSSL) of the Sun is independent of latitude and radius. Theoretical
meanfield models have been successful in explaining this property of
the solar NSSL, while global direct convection models have been
unsuccessful. We investigate reason for this discrepancy by measuring
the mean flows, Reynolds stress, and turbulent transport coefficients
under NSSL conditions. Simulations have minimal ingredients. These
ingredients are inhomogeneity due to boundaries, anisotropic turbulence,
and rotation. Parameters of the simulations are chosen such they match
the weakly rotationally constrained NSSL. The simulations probe locally
Cartesian patches of the star at a given depth and latitude. The depth
of the patch is varied by changing the rotation rate such that the
resulting Coriolis numbers
Original language  English 

Journal  Astronomy & Astrophysics 
Publication status  Accepted/In press  1 Dec 2020 
MoE publication type  A1 Journal articlerefereed 
Keywords
 Astrophysics  Solar and Stellar Astrophysics
 Physics  Fluid Dynamics
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Projects
 1 Active

UniSDyn: Building up a Unified Theory of Stellar Dynamos
Käpylä, M., Rheinhardt, M. & Pekkilä, J.
01/01/2020 → 30/04/2024
Project: EU: ERC grants