Experimental investigation and modeling on the flow-structure interactions of pendulum systems
Fluid–structure interactions involving pendular systems are prevalent in both natural and engineering environments, often leading to rich dynamical behaviors and instabilities.
In this talk, we focus on the flow-structure interactions of simple pendulum systems with one degree of freedom in the crossflow direction. We begin with a disk pendulum and show how the variation in the yaw angle of the disk gives rise to complex bi-stable dynamics. We also present how the dynamics are modeled by a simple stochastic approach.
We then examine a pendulum with a "T-shaped" geometry. This configuration triggers galloping instability, resulting in large amplitude oscillations. We analyze the flow–structure interaction and show how a nonlinear oscillator model can predict the behavior of the system.
Finally, we show how additive manufacturing combined with miniature pressure sensors helps the investigations. These techniques enable direct aerodynamic force estimation on the slender "T-shaped "geometry (as thin as 3 mm). They also paved the way for the development of cost-effective multi-hole pressure probes.
Contact Christophe Brun for more information or to schedule a discussion with the seminar speaker.