Large Scale Structures under Adverse Pressure Gradient EuHIT Funded Project

Team

Omid Amili
University of Minnesota, Minneapolis, United States
Callum Atkinson
Monash University, Melbourne, Australia
Rainer Hain
Bundeswehr University Munich, Neubiberg, Germany
Agocs Janos
German Aerospace Centre (DLR), Goettingen, Germany
Sven Scharnowski
Bundeswehr University Munich, Neubiberg, Germany
Andreas Schroeder
German Aerospace Centre (DLR), Goettingen, Germany
Julio Soria
Monash University, Melbourne, Australia
Christian Willert
German Aerospace Center (DLR), Koeln, Germany

Overview

Research Infrastructure
LMFL Boundary Layer Wind Tunnel, France
Facilities used
LMFL Boundary Layer Wind Tunnel (LML)
Project leader
Christian J. Kähler
Universität der Bundeswehr München, Neubiberg, Germany

Abstract

Over the last several years, the observation of large scale turbulent flow structures in turbulent boundary layer flows has stimulated intense experimental and numerical investigations with the aim of characterizing not only the topological features of the coherent structures but also their dynamics. Due to the large length of the structures (approximately 7-14δ) it is very difficult to analyse them reliably since both a large field of view and a high spatial resolution are simultaneously required to measure all relevant spatial scales. Moreover, a low uncertainty of the experimental techniques is required as the disturbance of the velocity field can be quite weak. As a consequence of the recent technological progress, the required measurement uncertainty can be reached with sophisticated image analysis techniques but the resolution of the structures requires a number of sCMOS cameras which is not available at any one research organisation alone. The aim of this project is to combine the sCMOS cameras of all team members to make large scale turbulent boundary layer measurements with the highest spatial resolution possible. Since the structure and dynamics of the large scale turbulent flow structures is unknown, as is their significance for the statistical properties of the flow, in the case of adverse pressure gradients (APG), the fundamental aim of this project is to resolve and characterize these structures in an APG boundary layer flow at the LML.