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Turbulence in the boundary layer of precession-driven flow

Authors

Shih,  Sheng-An
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Triana,  Santiago Andrés
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rekier,  Jérémy
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dehant,  Véronique
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Shih, S.-A., Triana, S. A., Rekier, J., Dehant, V. (2023): Turbulence in the boundary layer of precession-driven flow, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4286


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021722
Abstract
The boundary layer (in the outer core) between the core and the mantle is known to be thin, with the nominal value about 0.11 meters. The presence of turbulence in the boundary layer has been proposed as a mechanism to explain the observed damping of the Free Core Nutation (FCN). However, the small amplitude of FCN makes the turbulence scenario unlikely. A recent study shows that the precession-driven flow is at the margin of turbulence. Here, we use a local Cartesian box model to study numerically the boundary layer. Our numerical results show that the boundary layer at certain latitudes is not turbulent. By considering the total dissipation in the boundary layer, we find an increase by a factor of 1.86 compared to the laminar solution, implying that the effective viscosity is increased by a factor of 3.5. This may have implications for the chemical interaction occurring at the core-mantle boundary.