ABSTRACT: The flow over open cavities represents a rich flow field and one of significant practical importance in the aerospace industry as well as many others. Fundamentally, the flow features in the cavity are driven by the shear layer at the opening and it’s interaction with the aft wall. These interactions create an intense aeroacoustic environment in and around the cavity which can be detrimental in many of the applications. This presentation will highlight predominantly experimental studies of the characteristics of flow over two- and three-dimensional cavity geometries and attempts at control with the aim of reducing the surface pressure fluctuations. The studies of the flow characteristics have been conducted over a range of free stream Mach numbers and have involved both Particle Image Velocimetry and time resolved surface pressure fluctuations measurements. These measurements have been used to develop low-dimensional descriptions of the flow using modal analysis and flow estimation techniques resulting in a time dependent description of the flow field. From these results and the introduction of some collaboratively performed numerical simulations, a better understanding of the sources in the flow has been developed which can be used guide flow control. In addition to the studies of the flow features open loop control using several leading-edge flow control concepts in model- and full-scale applications.

BIOSKETCH: Dr. Lawrence Ukeiley works in the fields of fluid mechanics, experimental methods, flow control, reduced order modeling, and fluid structure interactions. He is currently a Professor inthe Mechanical and Aerospace Engineering Department at the University of Florida. He received his B.S. in Mechanical Engineering from Alfred University and his MS and PhD in Mechanical Engineering from Clarkson University. Since graduating with his doctorate he has held positions at BEAM Technologies (Research Scientist), NASA Langley Research Center (NRC Post-Doctoral Associate) and the Jamie Whitten National Center for Physical Acoustics at the University of Mississippi (Senior Research Scientist) before joining the faculty at UF. Dr. Ukeiley is an active member in many professional societies and has served on the Technical Committees in both the AIAA and ASME.