The Richtmyer-Meshkov Instability in Cylindrical Geometry: Experiments and Simulation

Details The Richtmyer-Meshkov Instability in Cylindrical Geometry: Experiments and Simulation The Richtmyer-Meshkov Instability in Cylindrical Geometry: Experiments and Simulation

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dfd.bq005g&link_type=abstract

American Physical Society, 54th Annual Meeting of the Division of Fluid Dynamics November 18 - 20, 2001 San Diego, California Me

Physics

Fluid Dynamics

Scientific paper

Hydrodynamic instabilities are important to many fields: astrophysics, inertial confinement fusion and inertial fusion energy. Rayleigh-Taylor (RT) is caused when a material of higher density is accelerated by a material of lower density. Richtmyer-Meshkov (RM) is produced when an shock wave accelerates a material interface causing small disturbances to grow. The RT interface is unstable when an external force acts from a heavy material to a lighter material. RM instability is present whether an incident shock travels from light to heavy or vice versa. Most theoretical, computational and experimental work has been performed for the RM instability in planar geometry. Usually applications of the RM instability occur in curved geometry: cylindrical or spherical. Nova Laser was used to investigate the RM instability in the strong-shock, high-compression regime. A shock was launched into a copper hemicylinder with a thin plastic ablator layer by focusing 6 KPP-smoothed, 1 ns square laser beams at 3ω onto the interior of the target. A single-mode sinusoidal perturbation was machined onto the outer surface of the copper, which was embedded in a thick layer (800 μm) of plastic. We will show numerical simulations of the experiment using two different codes: FronTier and CALE. This work was performed under the auspices of the U.S.DOE by UC,LLNL under Contract W-7405-Eng-48.

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