Hi! I'm Rémy, an early career researcher. I defended my PhD in April 2024 at ISTerre lab in Grenoble on topographic core-mantle coupling within the ERC project "THEIA". I'm currently a research fellow at ISTerre until the end of June 2024. I am interested in geophysical fluid dynamics, rotating flows and magnetohydrodynamics.
Earth and Moon's rotations are tracked accurately, and these data are inverted with rotation
models, providing coupling between the liquid core and the solid layers (mantle, inner
core). Despite these well-constrained values, the coupling mechanisms are still disputed.
Interactions between planetary fluid layers and their solid boundaries are crucial aspects
when studying flow dynamics and planetary motions. These couplings are not
straightforward to calculate and can originate from pressure, gravity, viscous, or
electromagnetic forces.
This topic has been widely explored in atmospheric and oceanic sciences but also has an
interest for planetary interiors (e.g., liquid cores, magma oceans of exoplanets, subsurface
oceans of icy moons). We thus need models combining rotation, stratification, and
magnetic fields.
On Earth, it is a key aspect that is missing in forward models to explain the decadal change
of the length of the day and the concomitant changes in core axial angular momentum, as
well as the dissipation of the retrograde annual nutation.
Here, we focus on the small-scale topographic effects caused by the flow in a stratified
liquid core over a bumpy mantle, which gives rise to pressure forces or/and increases the
electromagnetic coupling.
We develop a local Cartesian model based on plane wave perturbations, following the work
of Jault (2020) and Glane & Buffett(2018). Our code ToCCo, relying on symbolic and
arbitrary precision calculations, unlocks several limitations of previous approaches. Our
“higher-order” solutions go beyond the forced wave linear regime, investigating non-linear
effects and improving on previous results. With this new method, we explore a wide range
of parameters and boundary conditions for arbitrary topography shapes. We also consider
the spherical geometry, via spatial integration, that includes the lateral variations of the
magnetic field and of the orientation of the rotation vector. To do so, we have implemented
the “improved β-plane” approximation of Dellar (2011), for both the magnetic field and the
rotation vector.
ISTerre , Grenoble Institute of Earth Sciences, Gières, 38610, France
M.SC.2 INTERNSHIP: TOPOGRAPHIC EFFECTS AND WAVE EMISSION IN ROTATING STRATIFIED FLUIDS
Feb 2020 - July 2020LEGI, Laboratory of industrial and geophysical flows, Gières, 38610, France
M.SC.1 INTERNSHIP: THE MONT BLANC AND ITS COOLING ROLE IN THE ARVE VALLEY DURING ”COLD AIR POOL” EPISODES
Apr 2019 - May 2019ISTerre , Grenoble Institute of Earth Sciences, Gières, 38610, France
L.SC.3 INTERNSHIP: DOUBLE DIFFUSIVE CONVECTION IN ROTATING STRATIFIED SPHERES
Apr - July 2018M.SC. Atmosphere, Climate, Continental Surfaces 2018 - 2020
B.SC. Physics, Earth Sciences, Mechanics 2015 - 2018