Woodruff School of Mechanical Engineering

Mechanical Engineering Seminar


Turbulent Mixing Induced by Shock-driven Instabilities


Dr. Ricardo Mejia-Alvarez


Los Alamos National Laboratory


Thursday, March 17, 2016 at 11:00:00 AM


Love Building, Room 109


Dr. Devesh Ranjan


Turbulent Mixing Induced by Shock-driven Instabilities: Instability (RMI) occurs when a shock wave interacts with a spatially perturbed interface between two fluids of different density. The subsequent growth of this instability typically results in turbulent mixing of species. RMIs are known to take place from large-scale processes like supernovae, to microscopic scales like inertial confinement fusion (ICF). A deep understanding of the physical phenomena behind RMI is critical, either to understand the consequences behind the natural events in which it is present, or to attempt to control its effects in technological applications. In this talk, I will discuss some fundamentals of this phenomenon as well as some of my experimental contributions at Los Alamos National Laboratory.


Ricardo Mejia-Alvarez obtained a B.S. degree in Mechanical Engineering from The National University of Colombia in 2000 (Summa Cum Laude) and a M.Sc. degree in Thermal Engineering in 2004 from the University of Antioquia (at Medellin - Colombia). The same year, he obtained a Fulbright fellowship to pursue Ph.D. studies in the University of Illinois at Urbana-Champaign, where he was the recipient of the 2007 MechSE James O. Smith award for teaching excellence, and obtained a M.Sc. and a Ph.D. degree in Theoretical and Applied Mechanics. For his work on turbulent boundary layers over highly irregular rough surfaces, the American Physical Society awarded Ricardo the 2011 version of the Francois Frenkiel Award for Fluid Dynamics. After concluding his Ph.D. program, he joined the Extreme Fluids Team at Los Alamos National Laboratory as a Postdoctoral Research Associate, where he conducted experimental research on shock-driven instabilities, relevant to supernova explosions, inertial confinement fusion, and stockpile stewardship. Ricardo is currently a Research Scientist at Los Alamos National Laboratory, where he conducts studies relevant to national security.


Refreshments will be served.