Modeling of a Divergent Geometry RM Experiment on Nova

Details Modeling of a Divergent Geometry RM Experiment on Nova Modeling of a Divergent Geometry RM Experiment on Nova

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.rp194k&link_type=abstract

American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #RP

Physics

Plasma Physics

Scientific paper

Richtmeyer-Meshkov (RM) instabilities in divergent geometry are important in astrophysical phenomenon such as supernovae (Arnett, D., Fryxell, B.A., and Mueller, E., Ap.J. 341, L63, 1989) The effect of divergence upon the growth of hydrodynamic instabilities in the nonlinear regime is only partly understood, and mainly for the case of incompressible fluids (Plesset, J. Appl. Phys 28, 96, 1954; Yedvab et al., proc. 6th IWMPTCM, Marseille, 528, 1997). At Lawrence Livermore National Laboratory (LLNL), the Nova Laser was used to to send a 15 Mbar shock outward through a sinusoidal material perturbation at the interface between the inner heavy layer (Cu) and the outer light layer (CH) of a cylindrical target, triggering the RM instability at the interface. Numerical simulations of the experiments are done using the code HYADES, the LLNL code CALE, and the astrophysics code PROMETHEUS. Potential flow and thin shell theory are used to model undecompressed bubble and spike positions (Ott, PRL 29, 1429, 1972; Alon et al., PRL 74, 534, 1995; J. Kane et al., Phys. Plasmas 6, 2065, 1999.) * Work performed under the auspices of the U.S. DOE by LLNL under contract number W-7405-ENG-48 through ILSA.

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