MechE Colloquium: Toward Analysis and Control of Extreme Aerodynamic Flows

Thumbnail

Event details

Date 06.12.2022 12:0013:00  
Speaker Prof. Kunihiko Taira, Computational and Data-Driven Fluid Dynamics Group, Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA)
Location Online
Category Conferences - Seminars
Event Language English
Abstract: Modern air vehicles trying to operate in adverse weather or wakes of urban canyons and mountainous terrains would be hit by strong large-scale atmospheric disturbances.  In such extreme aerodynamic conditions, flight control becomes a great challenge, if not impossible, due to the enormous transient forces that the vehicles experience.  Currently, encounters with these extreme flow phenomena limit operations of fixed and rotating wing aircraft, especially those that are small to medium in size.  The present study is focused on the analysis, modeling, and control of extreme aerodynamic flows, with unsteadiness far larger in amplitudes than those considered in traditional aerodynamics on a time scale comparable to that of the flow instabilities.  A major challenge with extreme aerodynamic problems is the complete lack of theoretical foundation and a unified perspective to tackle such complex nonlinear problems.  The high dimensionality, strong nonlinearity, and multi-scale properties of these extreme flows make effective analysis and control a tremendous challenge.  Without the reduction of the state variable dimension and extraction of dominant dynamics, the application of dynamical systems and control theory for flow control remains a difficult task.  Our research group focuses on developing physics-based to model and control complex fluid flows by leveraging data-driven techniques and high-performance computing.  Equipped with these toolsets, we extract essential dynamics to facilitate the development of sparse and reduced-order models to design flow control strategies for high-dimensional unsteady fluid flows.  We discuss some of the challenges and successes in characterizing, modeling, and controlling extreme aerodynamic flows for lifting surfaces.

This work is supported by the Vannevar Bush Faculty Fellowship and the Air Force Office of Scientific Research.

Biography: Kunihiko Taira is a Professor of Mechanical and Aerospace Engineering at UCLA working in the areas of unsteady aerodynamics and flow control, leveraging computational and data-driven techniques. Prior to joining his current institution, he was a faculty member at Florida State University. He received his B.S. from the University of Tennessee, Knoxville, and his M.S. and Ph.D. from the California Institute of Technology. He is a recipient of the AFOSR Young Investigator Award, the ONR Young Investigator Award, and the Vannevar Bush Faculty Fellowship.  He is an Associate Fellow of the AIAA and serves as an associate editor for the AIAA Journal and the Theoretical and Computational Fluid Dynamics.

Practical information

  • General public
  • Free

Organizer

Tags

MechE Colloquium: Toward Analysis and Control of Extreme Aerodynamic Flows

Share