Physics – Fluid Dynamics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1005s&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1005
Physics
Fluid Dynamics
Scientific paper
Astrophysical bodies are subject to various harmonic forcings such as latitudinal or longitudinal librations, precession or tides. In this study we focus on the longitudinal libration forcing which takes place in planetary bodies such as Ganymede or Europa. Libration measurements can be used to constrain interior models by comparison with theoretical models. The accuracy of these constraints directly depends on the refinement of the model. Taking into account the influence of a non-trivial flow in the internal liquid layers of planetary bodies requires a precise knowledge of the fluid dynamics. In this work we consider a simple model of a librating shell and we focus on: (1) the mean zonal flow induced by a longitudinal libration which is determined using a weakly non-linear analysis; (2) the torque and the viscous dissipation in the interior fluid induced by longitudinal libration, which are numerically studied in various cases where inertial waves may be present or in the presence of a centrifugal instability at the outer boundary.
Cébron David
Le Bars Michael
Le Dizès S.
Sauret Alban
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