Generation of mean flows in rotating anisotropic turbulence: The case of solar near-surface shear layer

A. Barekat, M. J. Käpylä, P. J. Käpylä, E. P. Gilson, Hantao Ji

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The radial gradient of the rotation rate in the near-surface shear layer (NSSL) of the Sun is independent of latitude and radius. Theoretical mean-field 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 languageEnglish
JournalAstronomy & Astrophysics
Publication statusAccepted/In press - 1 Dec 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Astrophysics - Solar and Stellar Astrophysics
  • Physics - Fluid Dynamics

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