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• W3135275156 startingPage "A62" @default.
• W3135275156 abstract "Context. Turbulent transport in stellar radiative zones is a key ingredient of stellar evolution theory, but the anisotropy of the transport due to the stable stratification and the rotation of these regions is poorly understood. The assumption of shellular rotation, which is a cornerstone of the so-called rotational mixing, relies on an efficient horizontal transport. However, this transport is included in many stellar evolution codes through phenomenological models that have never been tested. Aims. We investigate the impact of horizontal shear on the anisotropy of turbulent transport. Methods. We used a relaxation approximation (also known as {tau} approximation) to describe the anisotropising effect of stratification, rotation, and shear on a background turbulent flow by computing velocity correlations. Results. We obtain new theoretical scalings for velocity correlations that include the effect of horizontal shear. These scalings show an enhancement of turbulent motions, which would lead to a more efficient transport of chemicals and angular momentum, in better agreement with helio- and asteroseismic observations of rotation in the whole Hertzsprung-Russell diagram. Moreover, we propose a new choice for the non-linear time used in the relaxation approximation, which characterises the source of the turbulence. Conclusions. For the first time, we describe the effect of stratification, rotation, and vertical and horizontal shear on the anisotropy of turbulent transport in stellar radiative zones. The new prescriptions need to be implemented in stellar evolution calculations. To do so, it may be necessary to implement non-diffusive transport." @default.
• W3135275156 created "2021-03-15" @default.
• W3135275156 creator A5023375159 @default.
• W3135275156 creator A5056314174 @default.
• W3135275156 date "2021-05-01" @default.
• W3135275156 modified "2023-10-18" @default.
• W3135275156 title "Anisotropic turbulent transport with horizontal shear in stellar radiative zones" @default.
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• W3135275156 doi "https://doi.org/10.1051/0004-6361/202039281" @default.
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