Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q28: Flow Instability: Rayleigh-Taylor/Richtmyer-Meshkov III
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B316
Chair: Jacob McFarland, University of Missouri
Abstract ID: BAPS.2018.DFD.Q28.9
Abstract: Q28.00009 : Ejecta velocities from twice-shocked metals
2:34 PM–2:47 PM
Presenter:
Praveen K Ramaprabhu
(Univ of North Carolina - Charlotte)
Authors:
Praveen K Ramaprabhu
(Univ of North Carolina - Charlotte)
Varad A Karkhanis
(Univ of North Carolina - Charlotte)
William T Buttler
(Los Alamos National Laboratory)
Frank J Cherne
(Los Alamos National Laboratory)
James E Hammerberg
(Los Alamos National Laboratory)
empirical, and accounts for the modification of the ejecta velocity due to initial amplitudes,
curvature and Mach number effects. The model has been validated extensively by comparison
with numerical simulations and published experimental data. In this work, we present an extension to ejecta from twice-shocked metals, where we find that taking the effective wavelength of the bubble in the model produces the most favorable comparison with data. Specifically, we compare with detailed continuum hydrodynamics and molecular dynamics simulations using the FLASH2 and SPASM3 numerical codes. Experimental data is obtained from target experiments in which two successive shocks were generated using a specially designed physics package4, while the ejecta velocities were measured using LDV techniques.
1V. Karkhanis et al., J. Appl. Phys., 123, 025902 (2018).
2B.Fryxell et al., Astrophys. J. Suppl. Ser., 131, 273 (2000).
3K. Kadau, T.C. Germann, and P.S. Lomdahl, Int. J. Mod. Phys. C 17, 1755 (2006).
4W.T. Buttler et al., J. Appl. Phys., 116, 103519 (2014).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q28.9
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