Turbulence from fractal impellers EuHIT Funded Project

Team

Berengere Dubrulle
Centre National de la Recherche Scientifique, Gif sur Yvette, France
Mathieu Gibert
CNRS, Grenoble, France
John Christos Vassilicos
Imperial College London, London, United Kingdom

Overview

Research Infrastructure
Max Planck High-Turbulence Facility, Germany
Facilities used
von Karman Flow Apparatus (GTF3)
Project leader
ewe-wei saw
CEA - Saclay, Gif sur Yvette, France

Abstract

In isotropic, homogeneous turbulence experiment, the energy is injected at large scale, and then cascade towards smaller scales, building a self-similar top to bottom cascade with an exponent close to -5/3. we would like to observe how is turbulence different when generated by impellers with Fractal blades in Von- Karman swirling flow experiment. From previous studies with Fractal grid turbulence in wind-tunnel, it was seen that there are interesting interaction between ”fractal generated” structures at a given scale, with the “cascade generated” structures created by the classical energy cascade from larger scales. Specifically are now interested to investigate the features of this type of turbulence from a Lagrangian measurement perspective. This will be done by the method of Lagragian particle tracking.