On the 26th of February 2020, Miguel Clape Linares will defend his PhD entitled "Numerical study of 2d stratified turbulence forced by internal gravity waves"
This PhD was co-supervised by Nicolas Mordant and Pierre Augier (LEGI).
The defense will take place at 2 pm at the LEGI (room K118).
The oceanic motions are composed of eddies with a very large horizontal scale and 3D propagating internal gravity waves. Its kinetic energy spectra follow the well-known Garrett and Munk spectrum, which is usually interpreted as the signature of interacting internal gravity waves. Our main motivation is to reproduce the turbulence regime observed in nature by forcing waves.
We first present the different regimes of 2D stratified turbulence with a particular interest in the ocean-like regime, i.e. strong stratification and large Reynolds number. The dynamics of the energy cascade is analysed by means of the spectral energy budget. Furthermore, we check if it is possible to obtain turbulence driven by weakly non-linear ineracting waves by performing a spatio-temporal analysis. To conclude, we report results of numerical simulations forced either on the vorticity or on the eigenmode of the Navier-Stokes equations in order to study the degree of universality of 2D stratified turbulence with respect to the forcing.