We continue our seminars serie, on Monday, December 15th at 13:00H
On site: Sala Multimedia 3.S1.08
For this event in the Aerospace PhD Seminar Series, we will have the pleasure of hosting Dr. Sina Ghaemi, Full Professor in the Department of Mechanical Engineering at the University of Alberta.
The event will take place in the Sala Multimedia 3.S1.08 on Monday, December 15th at 13:00pm and it will be streamed online.
Sina Ghaemi completed his BSc in Aerospace Engineering at Sharif University of Technology, Iran, in 2006, followed by an MSc in Mechanical Engineering at the University of Alberta, Canada, in 2009. He received his PhD in Aerodynamics from Delft University of Technology, the Netherlands, in 2013, under the supervision of Professor Fulvio Scarano. After completing his PhD, he joined the Department of Mechanical Engineering at the University of Alberta as an Assistant Professor. Sina was promoted to Associate Professor in 2019 and to Full Professor in 2022. His research interests are broad and span both fundamental and applied areas. The fundamental component focuses on understanding various turbulent flows to develop effective flow-control strategies, while the applied component involves projects related to aerodynamics and multiphase flows..
“Understanding and Control of Turbulent Flows: Key Experimental Observations“
Abstract:
In his seminar, he will present three experimental investigations aimed at advancing their understanding and capability to control various turbulent flows.
(a) The first investigation examines how active, localized surface deformation influences near-wall velocity fluctuations generated by a wall-mounted hemisphere. The insights from this experiment were applied to a subsequent study aimed at controlling very-large-scale motions (VLSMs) in a turbulent boundary layer (TBL). This experiment used real-time particle image velocimetry for sensing and a custom-built linear actuator to generate local surface deformations. The results demonstrate attenuation of the VLSMs when the controller operated in an opposition mode based on measurements of streamwise velocity fluctuations.
(b) The second investigation focuses on understanding turbulent motions in the wake of an Ahmed body. This study combines time-resolved, three-dimensional velocity measurements with spectral proper orthogonal decomposition to classify and interpret the underlying turbulent structures. Sina will also discuss the extension of this work to higher Reynolds numbers and outline future plans for implementing active flow control in this configuration.
(c) The third investigation examines the unsteady topology of the separation front, the formation of large zones of velocity fluctuations, and their relationship with the breathing motion in the separated TBL over a thick airfoil. Additionally, Sina will show how the breathing motion correlates with surface pressure fluctuations, providing a basis for developing sensing techniques for active flow-control strategies. Finally, he will present their ongoing research extending these investigations to dynamic stall and the future implementation of active flow control for this case.
The seminar will begin at 13:00 pm and will take place in the Sala Multimedia 3.S1.08.
No previous registration is required.
PhD in Aerospace Engineering UC3M 