MechE Colloquium: Dynamics of laminar separation bubbles on airfoils
Cancelled
Event details
| Date | 05.05.2020 |
| Hour | 12:15 › 13:15 |
| Speaker | Prof. Serhiy Yarusevych, Fluid Mechanics Research Laboratory, Department of Mechanical and Mechatronics Engineering, University of Waterloo |
| Location | |
| Category | Conferences - Seminars |
Abstract:
A brief overview of ongoing and recent research projects in the Fluid Mechanics Research Laboratory will be presented first. These projects include experimental investigations of airfoil performance in low Reynolds number flows, flows over complex cylindrical geometries common to mechanical systems and civil structures, energy harvesting from vortical structures, flow induced vibrations, and flow control.
The main presentation will focus on separating-reattaching flows on airfoils and their response to forcing. Recent advancements in small and medium scale wind turbines as well as unmanned aerial vehicles brought about an increased interest in airfoil operation at low chord Reynolds numbers (below about 500,000). Airfoil performance in this domain of Reynolds numbers differs significantly from that common to high Reynolds number flows. In particular, a laminar boundary layer on the suction side of the airfoil often separates even at low angles of attack, which detrimentally affects airfoil performance. The severity of airfoil performance degradation depends significantly on separated shear layer development. The shear layer is inherently unstable and undergoes transition to turbulence downstream of separation, which can lead to flow reattachment and the formation of a separation bubble. Recent results from a series of experimental studies will be presented to provide a new outlook on the attendant bubble dynamics and the response of such flows to controlled excitation.
Bio:
Dr. Serhiy Yarusevych received his PhD in Mechanical Engineering from the University of Toronto in 2006. Since 2006, he has been directing the Fluid Mechanics Research Laboratory in the Department of Mechanical and Mechatronics Engineering at the University ofWaterloo, Canada. His research is focused on fluid mechanics and its multidisciplinary applications in engineering, including operation of airfoils at low Reynolds numbers, flows over bluff bodies, free shear flows, flow induced vibrations and noise, laminar-to-turbulent transition, and flow control.
A brief overview of ongoing and recent research projects in the Fluid Mechanics Research Laboratory will be presented first. These projects include experimental investigations of airfoil performance in low Reynolds number flows, flows over complex cylindrical geometries common to mechanical systems and civil structures, energy harvesting from vortical structures, flow induced vibrations, and flow control.
The main presentation will focus on separating-reattaching flows on airfoils and their response to forcing. Recent advancements in small and medium scale wind turbines as well as unmanned aerial vehicles brought about an increased interest in airfoil operation at low chord Reynolds numbers (below about 500,000). Airfoil performance in this domain of Reynolds numbers differs significantly from that common to high Reynolds number flows. In particular, a laminar boundary layer on the suction side of the airfoil often separates even at low angles of attack, which detrimentally affects airfoil performance. The severity of airfoil performance degradation depends significantly on separated shear layer development. The shear layer is inherently unstable and undergoes transition to turbulence downstream of separation, which can lead to flow reattachment and the formation of a separation bubble. Recent results from a series of experimental studies will be presented to provide a new outlook on the attendant bubble dynamics and the response of such flows to controlled excitation.
Bio:
Dr. Serhiy Yarusevych received his PhD in Mechanical Engineering from the University of Toronto in 2006. Since 2006, he has been directing the Fluid Mechanics Research Laboratory in the Department of Mechanical and Mechatronics Engineering at the University ofWaterloo, Canada. His research is focused on fluid mechanics and its multidisciplinary applications in engineering, including operation of airfoils at low Reynolds numbers, flows over bluff bodies, free shear flows, flow induced vibrations and noise, laminar-to-turbulent transition, and flow control.
Practical information
- General public
- Free