Reference : UMR7342-MICLEB-003
Nombre de Postes : 1
Workplace : MARSEILLE 13
Date of publication : Wednesday, January 25, 2023
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 April 2023
Proportion of work : Full time
Remuneration : from 2889 to 4541 euros (monthly gross) depending on experience
Desired level of education : PhD
Experience required : Indifferent
The solar system has many icy moons, rich in water and likely to harbor a liquid ocean under their icy crust. The internal dynamics of these systems remain largely unknown, in particular the main sources of oceanic motions and heat, and the exchanges between the abyss and the surface. Two of the most ambitious planetary missions to come are dedicated to characterizing such worlds: ESA's JUICE towards Ganymede, and NASA's Europa Clipper. To prepare these missions, a better theoretical knowledge of the expected flows is necessary. This is the objective of our ANR COLOSSE project (collaboration with LPG Nantes and IPG Paris), using a dual experimental and numerical approach.
In this postdoctoral project, we will address the following fundamental question: considering a density-stratified ocean, what turbulence and what mixing rate can be expected from a libration forcing (i.e. periodic modulation of the rotation rate), a mechanism of great relevance in icy moons subject to a strong gravitational coupling with their planet and significantly deformed by tides? We will tackle this question by an experimental approach.
The postdoc will be responsible for:
- the installation of the metrology (PIV and conductivity probe) on the experimental set-up already operational, in coordination with the technical support services of the laboratory;
- the realization of systematic measurements of the velocity field and mixing rate for various amplitudes and frequencies of libration in a large scale topography (i.e. elliptical cylinder);
- the realization of systematic measurements of the velocity field and mixing rate for various small-scale topographies (rough bottoms by 3D printing).
The analysis of the results will be done in collaboration with the scientific PIs of the project.
The candidate must have a solid experience in experimental fluid mechanics, in particular on the realization and analysis of velocimetry measurements (PIV). No specific knowledge in geophysics is necessary, but a confirmed interest in interdisciplinary sciences is essential.
IRPHE, a joint research unit of Aix-Marseille University, CNRS and École Centrale Marseille, is a multidisciplinary institute. Its research topics mainly concern fluid mechanics, energetics in the broad sense including combustion and reactive systems, the physics of fronts and interfaces, the self-organization of out-of-equilibrium systems, the biomechanics and biophysics, the rotating flows and in particular those related to astrophysics and geophysics, the interactions between the ocean and the atmosphere as well as the environmental applications of turbulence.
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