From Supernovae to Confinement Fusion: mixing under extreme conditions
with Dr. Ricardo Mejia-Alvarez, Extreme Fluids Group, Los Alamos National Laboratory

DateOctober 21, 2013Time12:20 - 1:20 pm
LocationRogers Engineering Building, Room 204
Description

From Supernovae to Confi nement Fusion: mixing under extreme conditions
Ricardo Mejia-Alvarez, Extreme Fluids Group, Los Alamos National Laboratory

Abstract: A Richtmyer-Meshkov Instability (RMI) occurs when a shock wave interacts with a spatially perturbed interface between two uids of di erent density. The subsequent growth of this instability typ- ically results in turbulent mixing of species under extreme conditions. RMIs are known to take place from large-scale processes like supernovae, to microscopic scales like inertial con nement 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 e ects in technological appli- cations. Los Alamos National Laboratory (LANL) is part of a national e ort to develop the technology for ICF. In this talk, I will discuss some fundamentals of this phenomenon as well as the experimental contributions of the Extreme Fluids Team at LANL.

Short Bio: Dr. Mejia-Alvarez obtained his B.S. degree in Mechanical Engineering from The National University of Colombia in 2000 (Summa Cum Laude). He was one of the recipients of the 2000-2001 Best Theses Award from the National University of Colombia for his work on Unsteady Forced Convection in Packed Beds. He continued his work on unsteady forced convection at The University of Antioquia (at Medellin - Colombia), where he earned his M.S. degree in Thermal Engineering in 2004. The same year, he obtained a Fulbright fellowship to pursue Ph.D. studies in the University of Illinois at Urbana- Champaign under the supervision of Professor Kenneth T. Christensen. While in Illinois, Ricardo was the recipient of the James O. Smith award for teaching excellence and obtained a M.S. and PhD degrees in Theoretical and Applied Mechanics. For his work on turbulent boundary layers over highly irregular rough surfaces, Ricardo was the recipient of the 2011 APS Frenkiel Award for Fluid Mechanics. After concluding his Ph.D. program, he joined the Extreme Fluids Team at Los Alamos National Laboratory as a Postdoctoral Research Associate, to conduct experimental research on ows under extreme conditions with the supervision of Dr. Katherine P. Prestridge. Ricardo was recently converted into a Sta Scientist at LANL. His current work focuses on shock-driven instabilities.

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