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Coupled experimental-numerical study of libration driven flows in planetary cores and subsurface oceans.

English title Coupled experimental-numerical study of libration driven flows in planetary cores and subsurface oceans.
Applicant Noir Jérõme André Roland
Number 140708
Funding scheme Project funding
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Astronomy, Astrophysics and Space Sciences
Start/End 01.04.2012 - 31.03.2016
Approved amount 210'339.00
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All Disciplines (2)

Discipline
Astronomy, Astrophysics and Space Sciences
Geophysics

Keywords (8)

angular momentum; laboratory experiment; libration; ellipsoid; dynamo; magnetic field; planetary cores; subsurface oceans

Lay Summary (English)

Lead
Lay summary
Significant ressources are presently devoted to the investigation of librating planets such as Europa, Titan, Io, Mercury, Callisto, Ganymede and the Earth's moon. These efforts, which include space mission and ground based studies, suggest that in some cases the planetary upper solid layers are decoupled from the deep interior by a fluid layer, such as a liquid core on Mercury or on the Earth's moon and possibly a subsurface ocean on Titan and Europa. Despite the increasing amount of data, the current simple models of cores and subsurface oceans dynamics limit significantly our ability to probe in greater details the interior of the planets from astronomical and magnetic observations.

The present proposal seeks financial support for one PhD student and fabrication of a new libration experiment. We aim to carry out coupled experimental and numerical simulations to derive more realistic models of the flow driven inside the liquid layers of a librating planet by viscous and topographic couplings. The objectives of the proposed coupled experimental-numerical project are two-fold: 1) To characterize the flows driven by longitudinal and latitudinal libration in a generic triaxial geometry; 2) To establish scaling laws for the energy dissipation and angular momentum transfer as the control parameters tends toward planetary settings. The outcome of the proposed study will contribute to a better understanding of planetary dynamics by improving upon the current solid body rotation models of the liquid layer inside librating planets. LLR and VLBI data could then be interpreted in greater details in terms of internal structure of planets such as the Earth's moon and Mercury. In addition, our results will serve as a guidance for direct numerical simulations of induced magnetic field to compare with the upcoming satellite observations from space missions Messenger, Bepi-Colombo on Mercury and EJSM Europa.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Libration-driven inertial waves and mean zonal flows in spherical shells
Lin Yufeng, Noir Jérôme (2020), Libration-driven inertial waves and mean zonal flows in spherical shells, in Geophysical & Astrophysical Fluid Dynamics, 1-22.
Latitudinal libration driven flows in triaxial ellipsoids
Vantieghem Stijn, Cebron David, Noir Jerome (2015), Latitudinal libration driven flows in triaxial ellipsoids, in Journal of Fluid Mechanics, 771, 193-228.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Structures and Dynamics of Earth like planets Poster Flows and Instabiolities driven by latitudinal libration ub truxual ellipsoids 20.11.2014 Paris, France Charles Yoann;
European Post-Graduate Fluid dynamics conference Poster Experimental Study of latitudinally driven flows ib planetary cores. 04.09.2014 illemenhau , Germany Charles Yoann;
SEDI 2014 Poster Experimental Study of latitudinally driven flows ib planetary cores. 03.08.2014 Kanagawa, Japan Charles Yoann;
GDRe Dynamo Poster Inverse pumping in swearling flows 06.09.2013 Cargese, France Charles Yoann;
non linear hydrodynamics Poster Inertial Modes resonance driven by latitudinal libration in triaxial ellipsoide 02.09.2013 Paris, France Charles Yoann;


Abstract

Significant ressources are presently devoted to the investigation of librating planets such as Europa, Titan, Io, Mercury, Callisto, Ganymede and the Earth's moon. These efforts which include space mission and ground based studies suggest that in some cases the planetary upper solid layers should be decoupled from the deep interior by a fluid layer, such as a liquid core on Mercury or on the Earth's moon and possibly a subsurface ocean on Titan and Europa. Despite the increasing amount of data, the current simple models of cores and subsurface oceans dynamics limit significantly our ability to probe in greater details the interior of the planets from astronomical and magnetic observations. The present proposal seeks financial support for one Phd student and fabrication of a new libration experiment. We aim to carry out coupled experimental and numerical simulations to derive more realistic models of the flow driven inside the liquid layers of a librating planet by viscous and topographic couplings. The objectives of the proposed coupled experimental-numerical project are two-fold: 1) To characterize the flows driven by longitudinal and latitudinal libration in a generic triaxial geometry, 2) To establish scaling laws of the energy dissipation and angular momentum transfer as the control parameters tends toward planetary settings. The outcome of the proposed study will contribute to a better understanding of planetary dynamics by improving upon the current solid body rotation models of the liquid layer inside librating planets. LLR and VLBI data could then be interpreted in greater details in terms of internal structure of planets such as the Earth's moon and Mercury. In addition, our results will serve as a guidance for direct numerical simulations of induced magnetic field to compare with the upcoming satellite observations from space missions Messenger, Bepi-Colombo and EJSM, respectively, on Mercury and Europa.
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