PICS Colloquium: “Driving Physics of Inverted Flag Flapping” with Andres Goza

On Friday, February 25 at 2:00 PICS will present a virtual colloquium with Professor Andres Goza, Assistant Professor Aerospace Engineering at the University of Illinois Urbana-Champaign.

Title: Driving physics of inverted flag flapping

Abstract: Fluid-structure interaction (FSI) is ubiquitous in the natural and engineered world, and a better understanding of FSI systems can aid in the design of renewable energy harvesting technologies, bio-inspired propulsion vehicles, and biomedical devices (to name a few applications). In this talk we will investigate “inverted” flag flapping, in which the flag is clamped at its trailing edge with respect to the incoming uniform flow. This canonical system exhibits a diverse range of behavioral regimes, including flapping with amplitudes comparable to the flag length, making it promising for energy harvesting. We will identify the physical mechanisms responsible for the onset of flapping, the role of vortex shedding in flapping, and the chaotic flapping regime that the system undergoes for different parameters. We will also characterize the effect of nonuniform flexibility in the dynamics of this beautiful FSI system, and discuss some efforts for reduced-order modeling of these varied behaviors.

Bio: Andres Goza is an Assistant Professor in the Aerospace Engineering Department at the University of Illinois at Urbana-Champaign. He received his PhD from Caltech in 2017 and was a postdoctoral researcher at Princeton University from 2017-2018. His research focuses on the use of computational fluid dynamics and modeling techniques to gain fundamental physical insights into fluid-structure interaction (FSI) systems. Andres’s interest in these systems ranges from harnessing flow-induced vibrations for robust energy harvesting to utilizing FSI for passive control and/or estimation of unsteady aerodynamic flows. His group is funded through NSF, AFOSR, and Sandia National Labs. He was awarded an NSF Graduate Research Fellowship to perform his doctoral work, and his thesis work led to his selection as a Caltech Everhart Lecturer. He was also a “Teacher Ranked As Excellent” at UIUC in 2020, and was awarded the “AIAA Teacher of the Year” award by the Aerospace Engineering Department at UIUC.