Turbulent Richtmyer{endash}Meshkov instability experiments with strong radiatively driven shocks
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
The Richtmyer{endash}Meshkov instability is investigated in the turbulent regime with strong radiatively driven shocks (Mach {gt}10) on the Nova laser [Phys. Rev. Lett. {bold 70}, 1806 (1993)]. The targets are planar with near solid density and Atwood number {approximately}{minus}0.9. The interfacial perturbations are three dimensional (3-D), random, and nonlinear with a broad scale distribution such that they develop into a turbulent mixing zone (TMZ). The TMZ is diagnosed radiographically using x-ray dopants localized to the center of the target to avoid edge effects. Two different diagnostic configurations yield comparable results. The total width of the TMZ is found to increase in time as H{approximately}t{sup {Theta}}, with {Theta}{approximately}0.5{plus_minus}0.1. When compared to shock tube data, this result supports the suggestion [Phys. Fluids {bold 8}, 614 (1996)] that {Theta} decreases with Mach number. The data are used to test turbulence models and to determine the effective drag coefficient C{sub d}{approximately}2.6{plus_minus}1.2 for potential flow mix models in the high compression regime. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Lawrence Livermore National Laboratory
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 553016
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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