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

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

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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