| Issue |
EAS Publications Series
Volume 82, 2019
Astro Fluid: An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements
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|
|---|---|---|
| Page(s) | 51 - 58 | |
| Section | Tides in Stars and Planets | |
| DOI | https://doi.org/10.1051/eas/1982005 | |
| Published online | 21 June 2019 | |
A.S. Brun, S. Mathis, C. Charbonnel and B. Dubrulle (eds)
EAS Publications Series, 82 (2019) 51-58
The turbulent response to tidal and libration forcing
1 Aix Marseille Univ., CNRS, Centrale Marseille, IRPHE, Marseille, France
2 Department of Earth, Planetary, and Space Sciences, University of California - Los Angeles, Los Angeles, CA, USA
* e-mail: favier@irphe.univ-mrs.fr
In conjunction with thermo-solutal convection, the turbulence generated in planetary liquid cores may be due to the role of boundary forcing through geophysically relevant mechanisms such as precession, libration and tidal forcing (Le Bars et al. 2015). In this paper, we discuss laboratory equatorial velocity measurements and selected high-resolution numerical simulations to show the generation of developed turbulence driven by longitudinal libration or tidal forcing. In both cases, the transition to saturated turbulence is driven by an elliptical instability that excites inertial modes of the system. We find striking similarities in both the transition to bulk turbulence and the enhanced zonal flow hinting at a generic fluid response independent of the forcing mechanism. We finally discuss the relevance of this work to the planetary regime and possible directions for future investigations.
© EAS, EDP Sciences, 2019