Dr. Steven J. Beresh

Dr. Steven J. Beresh

is a Distinguished Member of the Technical Staff at Sandia National Laboratories in Albuquerque, New Mexico, U.S.A., where he has worked since 1999 and leads the Experimental Aerosciences Facility.  He received his B.S. in Mechanical Engineering from Michigan State University in 1994 and his Ph.D. in Aerospace Engineering from The University of Texas at Austin in 1999.  His research interests emphasize the use of PIV for compressible aerosciences experimentation.  He is an Associate Fellow of the American Institute for Aeronautics and Astronautics, has served as Chair for the AIAA Aerodynamic Measurement Technology Technical Committee, and is a past President of the Supersonic Tunnel Association International.

Plenary Talk Title

Pushing the Frontiers of Time-Resolved PIV for Compressible Flows

Abstract

Time-resolved particle image velocimetry (TR-PIV) has become widespread in fluid dynamics, but its application to compressible flows encounters additional challenges that can be addressed by recently maturing technologies.  Building on pioneering efforts by other research groups, a pulse-burst laser has been used to obtain movies at up to 50 kHz in Sandia’s wind tunnels and shock tubes.  Pulse-burst PIV is now being used to obtain previously unrealized frequency-domain data in problems of practical aerodynamic importance including jet interactions, cavity acoustics, unsteady shock motion, and shock/particle interactions.  With some reconfiguration, pulse-burst PIV can obtain velocity power spectra at 100’s of kHz to reveal turbulence scaling laws inaccessible to conventional instrumentation.  The present work illustrates how advanced PIV capabilities are transforming the use of high-speed ground testing facilities.