Graduate Seminar Series – Dr. Kunihiko Taira, UCLA

“Tackling the Complex Dynamics of Unsteady Flows”

By: Dr. Kunihiko “Sam” Taira
Mechanical and Aerospace Engineering, UCLA

ABSTRACT: Controlling the behavior of flows around air, marine, and ground vehicles can greatly enhance their performance, efficiency, and safety. The high-dimensionality, strong nonlinearity, and multi-scale properties of these flows make effective control a tremendous challenge. Without the reduction of the state variable dimension and extraction of important dynamics, the application of dynamical systems and control theory for flow control becomes a remains a difficult task. Our research group focuses on developing physics-based approaches to model and control complex fluid flows by leveraging modal analysis, data science, network science, machine learning, and high-performance computing. Equipped with these toolsets, we can extract essential dynamics to facilitate the development of sparse and reduced-order models to design flow control techniques for high-dimensional unsteady fluid flows. We discuss some of the challenges and successes in characterizing, modeling, and controlling unsteady bluff-body wakes and stalled flows over wings. The techniques developed here are tested and validated with DNS and LES.

BIO: Kunihiko (Sam) Taira is an Associate Professor of Mechanical and Aerospace Engineering at UCLA working in the ares of unsteady aerodynamics and flow control, leveraging computational and data-driven techniques. Prior to his current position, he was an Associate Professor of Mechanical Engineering at the Florida State University. He received his B.S. (Aerospace Engineering and Mathematics) from the University of Tennessee, Knoxville. At UTK, he was fortunate to experience academic research as an undergraduate research assistant under the close guidance of Prof. Jay Frankel, who is now the MAE Department Head at NMSU. During his undergraduate research experience, he was trained in theoretical inverse heat transfer. He pursued his graduate degrees of M.S. (Mechanical Engineering) and Ph.D. (Mechanical Engineering) at the California Institute of Technology. He is a recipient of the 2013 U.S. Air Force Office of Scientific Research and 2016 U.S. Office of Naval Research Young Investigator Awards. He is an Associate Fellow of AIAA and serves as an Associate Editor of the AIAA Journal.

Tackling the complex dynamics of unsteady flows


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