Event
AE Seminar: Kunihiko Taira "Network-Theoretic Analysis of Unsteady Fluid Flows"
Thursday, October 20, 2016
3:00 p.m.
3164 Glenn Martin Hall (Aerospace Conference Room)
Anya Jones
http://www.aero.umd.edu/events/seminars
Kunihiko Taira
Assistant Professor
Florida A&M University
NETWORK-THEORETIC ANALYSIS OF UNSTEADY FLUID FLOWS
October 20th, 2016 | 3:00 PM
3164 Glenn Martin Hall (Aerospace Conference Room)
ABSTRACT: Fluid flows exhibit rich dynamics over a range of spatial and temporal scales due to their nonlinear interactions. Identification of important interactions present in the flow field can reveal deeper insights into the flow physics and may enable interaction-based control of fluid flows. In an effort to understand and characterize the complex web of interactions present in the flow field, we consider the use of network and graph theories for examining unsteady fluid flows. In this talk, we will discuss three representative problems to highlight the strength of network analysis. We first consider the quantification of vortical interactions for clusters of discrete vortices and derive the sparsified dynamics model. The formulation is then extended to examine turbulent flows, revealing the structures of turbulence networks and their network characteristics. Furthermore, we show preliminary findings on network-based analysis to identify kinetic energy transfer in canonical unsteady flows. From these examples, we demonstrate that the current network-based approaches are able to highlight important nonlinear interactions in the flow field that are not readily captured by traditional analyses and leverage that knowledge to perform feedback flow control. We will also present an overview of the CFD and active flow control efforts undertaken by our research group.
