Events

How flying insects cope with separated flow

Speaker :
Dr. Jong-Seob HAN
Research Fellow, Chair of Aerodynamics and Fluid mechanics, Technical University of Munich, Germany
Date : 3 Sep 2020 (Thu)
Time : 4:00 pm
Venue : https://hkust.zoom.us/
Organizer : Meeting ID:983 2470 9864

Abstract

Recent aerodynamic devices do not obey the conventional design languages, and thus easily create fully three-dimensional separated flows bringing complicated interaction in shed wake and vortices. These are beyond the theories or techniques we currently use; novel approaches coping with the flow are quite needful. It is worth taking a look at how flying insects cope with the separated flow. They do not try to keep smooth streamlines. Instead, they proactively employ an intense vortex system. This, completely different from a conventional engineering concept, creates a tiny tornado on the leading edge and augments the aerodynamic force over twice than estimated by the conventional aerodynamics, giving tremendous agility to them, which we need for state-of-art aerial vehicle development. 

In this seminar, the speaker will be presenting his journey to unravel underlying aerodynamic principles in flying insects. The reasons why the insects adept at hovering have a similar aspect ratio, and why they have a certain preferred flight speed will be discussed. The flight stability in hover will be then discussed. Finally, the most recent study on fundamental characteristics of the leading-edge vortex, which has been done with one large wind tunnel at the Technical University of Munich, will be presented with possible applications and future research.

Biography

Dr. Jong-Seob Han is an expert in experimental aerodynamics. He is currently a research fellow at the Chair of Aerodynamics and Fluid Mechanics, the Technical University of Munich, Germany. Before joining the TUM-AER in 2018, he worked as a research assistant professor at Korea Advanced Institute of Science of Technology, South Korea, where he received his PhD in 2016. He has published 17 peer-reviewed journal papers and received 9 awards, and has contributed to 11 peer-reviewed journals as a reviewer. His research interests include unsteady aerodynamics, low Reynolds number flow, separated flow, vortex-dominant flow, flow control, and measurement techniques in wind-tunnel testing.