Multiscale fluid mechanics at the ocean-atmosphere interface
| When |
Mar 14, 2023
from 11:00 to 12:00 |
|---|---|
| Where | Salle des thèses |
| Attendees |
Stéphane Popinet |
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Turbulent exchanges of mass, heat, and momentum between the ocean and the atmosphere are a critical component of the climate system. Climate models currently use relatively crude semi-empirical parameterisations of these fluxes often based on in-situ observation campaigns. The limitations of these parameterisations (range of validity, robustness, sensitivity, etc.) are well-known to climate modellers. They are due both to the difficulty of acquiring enough experimental data and to a lack of understanding of the complex processes linking sub-millimetric physics to kilometre-scale fluxes. In this talk, I will report on recent results from a collaborative effort to build a hierarchy of theoretical and numerical models able to span this range of spatial scales. The resulting framework will hopefully allow to fill the gap in available experimental/field data and to make the link between climate-scale parameterisations and small-scale physics.
References
[1] W. Mostert, S. Popinet, and L. Deike (2022). High-resolution direct simulation of deep-water breaking waves: transition to turbulence, bubbles and droplets production. Journal of Fluid Mechanics, 942, A27.
[2] J. Wu, S. Popinet, and L. Deike (2022). Revisiting wind wave growth with fully-coupled direct numerical simulations. Submitted to Journal of Fluid Mechanics.
[3] S. Popinet (2020). A vertically-Lagrangian, non-hydrostatic, multilayer model for multiscale free-surface flows. Journal of Computational Physics, 418:109609.
[4] T. Uchida, B. Deremble, and S. Popinet (2022). Deterministic model of the eddy dynamics for a midlatitude ocean model. Journal of Physical Oceanography, 52(6), 1133 1154.