The Center for Radiative
Shock Hydrodyamics (CRASH) is located at the University of
Michigan and is funded by the Department of Energy under
the Predictive Science Academic
Alliance Program . The purpose of the center is to develop
advanced techniques for predictive simulation of multiscale,
multiphysics phenomena, and to apply these methods to the problem
of radiative shock wave structure and propagation. These shock
waves are generated in the laboratory using lasers. The CRASH
experiments take place at the Omega Laser Facility associated with
the University of Rochester's Laboratory for Laser Energetics. The
target chamber of the facility is shown below.
Target Chamber of the Omega
Intense laser light is focused on a beryllium disk attached to
one end of plastic tube filled with xenon gas. The absorption of
the intense laser light vaporizes the surface of the beryillium
disk and generates a shockwave that propagates into the xenon at a
temperature of roughly 1,000,000 degrees Kelvin. The experimental
apparatus is shown below.
Experimental apparatus for
At these extreme temperatures, the thermal radiation takes the
form of x-rays. A shock wave propagating in the xenon is shown
CLASS is a partner with the University of Michigan in CRASH.
Modeling of radiative shocks requires the coupled solution of the
hydrodynamics equations and the radiation transport equation.
Faculty, staff, and students members of CLASS are contributing to
both the numerical methods and the software needed to model the
thermal radiation, and contributing to the development and
application of methodologies for estimating the uncertainty
associated with the overall calculation.
A shock wave propagating
in the xenon