Investigation of inertial particle dynamics in turbulent channel flow EuHIT Funded Project

Team

Jonathan Bodenschatz
MPIDS, Goettingen, Germany
Javier Jimenez
U. Politecnica de Madrid, Madrid, Spain
Jan Molacek
Max Planck Institute, Göttingen, Germany
Zellman Warhaft
Cornell University, Ithaca, United States
Haitao Xu
Max Planck Institute for Dynamics & Self-Organization (MPIDS), Goettingen, Germany

Overview

Research Infrastructure
LMFL Boundary Layer Wind Tunnel, France
Facilities used
LMFL Boundary Layer Wind Tunnel (LML)
Project leader
Eberhard Bodenschatz
MPIDS, Goettingen, Germany

Abstract

Experiments of the Max Planck Institute for Dynamics and Self-Organization (MPIDS, Goettingen Germany) at the environmental research station Schneeferner Haus at 2700m in the German Alps have shown that as a function of Stokes number circular disks void of cloud droplets appear in the highly turbulent flow of an atmospheric cloud. The MPIDS group led by Prof. Eberhard Bodenschatz and Project Leader Dr. Haiato Xu associates these approximately Taylor microscale vioids (or holes) with coherent vortical structures. It was also observed that in the close vicinity of the building, i.e., in the shear driven turbulent boundary layer, the behavior changed very significantly with the number of holes greatly increasing. In the School of Aeronautics Universidad Politecnica de Madrid (Spain) Javier Jimenez is conducting numerical simulations of inertial particle dynamics in shear driven turbulence. The measurements proposed here will use light sheets to identify the hole dynamics in the Lille Tunnel and will provide data to compare both with the atmospheric experiments as well as with the numerical investigation. The experiments shall be conducted with the help of Zellman Warhaft from the Department of Mechanical and Aerospace Engineering at Cornell University, who is an expert in turbulence/spray interactions and offers his expertise and spray generating equipment.