Milestone project

This year, I worked a lot on the project Milestone project (financed by Euhit). I was co-manager with Erik Lindborg (KTH, Stockholm) of this great project implying 4 researchers from KTH (Erik Lindborg, Antonio Segalini, Ashwin Vishnu Mohanan and Henrik Alfredsson), people from LEGI (in particular Joël Sommeria and Samuel Viboud) and one PhD student (Diane Micard) from LMFA (Lyon).

The proceding First report of the MILESTONE experiment: strongly stratified turbulence and mixing efficiency in the Coriolis platform has been presented at the VIIIth International Symposium on Stratified Flows (ISSF, Aug 2016, San Diego).

group guys

Abstract: During the last decade a new theory of stratified turbulence has emerged. The project aims at testing the predictions of this theory in controlled laboratory experiments for the first time. A series of experiments of high Reynolds number and low Froude number stratified turbulence will be carried out at the Coriolis platform. Turbulence generated by an array of translating vertical cylinders in the presence of background stratification, with and without system rotation, will by studied by means of PIV. Three-dimensional velocity fields from the wake will be retrieved, from which spectra, structure functions as well as different length scales will be calculated. Mixing efficiency for different buoyance Reynolds numbers will be estimated. The results will be compared with theoretical predictions as well as results from Direct Numerical Simulations.

These photos show the Coriolis platform during the experiment (left) and a to view for the experiment (right).

Coriolis carriage_top

The first results are very promising. Here are some nice photos of the particles used to do PIV moved by strongly stratified turbulence!

Flow 0. Flow 1.