MEchanics GAthering -MEGA- Seminar: Talk1 - Understanding the role of morphology and kinematics in bio-inspired locomotion; Talk2 - Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall
Event details
| Date | 24.10.2019 |
| Hour | 16:15 › 17:30 |
| Speaker | Fatma Ayancik & Guosheng He , UNFoLD, EPFL |
| Location | |
| Category | Conferences - Seminars |
Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion, by Fatma Ayancik
The development and use of bio-inspired autonomous underwater vehicles (AUVs) have been of great interest over the past years. If these vehicles’s ability to operate effectively over an extensive range of conditions was enhanced, they could be utilized for exploration in dynamic environments including scientific and military surveying purposes. In this regard, nature has thousands of design solutions that can operate in these dynamic environments and have adaptive swimming performance, which makes them effective and efficient at a host of tasks, and operational over a wide range of conditions.
In this talk, inspiring by the advanced capabilities of fish and other aquatic swimmers, we will focus on understanding fish-like propulsion in terms of morphology and kinematics. We will investigate the interplay along the morphology and kinematics and their influence on the swimming performance. With the help of Evolutionary Algorithm, we will search for an optimum morpho-kinematic feature by considering the three main aspects of the swimming performance: swimming speed, swimming range, and efficiency. Finally, scaling laws will be presented in this talk to provide insight into the flow physics that drive thrust production, power consumption, and efficient swimming when the morphology and kinematics are varied.
Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall, by Guosheng He
The flow around a pitching NACA0015 airfoil with an active trailing-edge flap is investigated using two-dimensional time-resolved particle image velocimetry and surface pressure measurements. The airfoil is pitching around the static stall angle of attack at α = 20° and the flap is either oscillating around the symmetrical plane at β = 0° or fixed at a deflection angle. The pitching of the airfoil and the deflection of the flap can be individually controlled in terms of mean angle, oscillating amplitude, frequency and initial phase angle. Variations of the phase delay between the oscillations of the main airfoil and the flap lead to the rotation, expansion or contraction of the lift curves undergoing dynamic stall. Quantitative evidences have been extracted from the PIV data to help elucidate the significantly modified aerodynamic characteristics of the pitching airfoil manipulated by an active flap.
The development and use of bio-inspired autonomous underwater vehicles (AUVs) have been of great interest over the past years. If these vehicles’s ability to operate effectively over an extensive range of conditions was enhanced, they could be utilized for exploration in dynamic environments including scientific and military surveying purposes. In this regard, nature has thousands of design solutions that can operate in these dynamic environments and have adaptive swimming performance, which makes them effective and efficient at a host of tasks, and operational over a wide range of conditions.
In this talk, inspiring by the advanced capabilities of fish and other aquatic swimmers, we will focus on understanding fish-like propulsion in terms of morphology and kinematics. We will investigate the interplay along the morphology and kinematics and their influence on the swimming performance. With the help of Evolutionary Algorithm, we will search for an optimum morpho-kinematic feature by considering the three main aspects of the swimming performance: swimming speed, swimming range, and efficiency. Finally, scaling laws will be presented in this talk to provide insight into the flow physics that drive thrust production, power consumption, and efficient swimming when the morphology and kinematics are varied.
Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall, by Guosheng He
The flow around a pitching NACA0015 airfoil with an active trailing-edge flap is investigated using two-dimensional time-resolved particle image velocimetry and surface pressure measurements. The airfoil is pitching around the static stall angle of attack at α = 20° and the flap is either oscillating around the symmetrical plane at β = 0° or fixed at a deflection angle. The pitching of the airfoil and the deflection of the flap can be individually controlled in terms of mean angle, oscillating amplitude, frequency and initial phase angle. Variations of the phase delay between the oscillations of the main airfoil and the flap lead to the rotation, expansion or contraction of the lift curves undergoing dynamic stall. Quantitative evidences have been extracted from the PIV data to help elucidate the significantly modified aerodynamic characteristics of the pitching airfoil manipulated by an active flap.
Practical information
- General public
- Free
Organizer
- MEGA.Seminar Organizing Committee