Mixing and length scales in Stratified Turbulence EuHIT Funded Project

Team

P. Henrik Alfredsson
Royal Institute of Technoogy (KTH), Stockholm, Sweden
Pierre Augier
CNRS, Grenoble, France
Ashwin Vishnu Mohanan
Royal Institute of Technology, Stockholm, Sweden
Antonio Segalini
KTH Mechanics, Stockholm, Sweden
Joel Sommeria
Centre National de la Recherche Scientifique, Grenoble, France

Overview

Research Infrastructure
CORIOLIS Rotating Platform, France
Facilities used
Coriolis Rotating Platform (Coriolis)
Project leader
Erik Lindborg
Royal institute of technology, Stockholm, Sweden

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.