Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session C02: Shallow Bubble Collapse II / Ejecta Surface
11:00 AM–12:30 PM,
Monday, July 11, 2022
Anaheim Marriott
Room: Platinum 6
Chair: Fady Najjar, Lawrence Livermore Natl Lab
Abstract: C02.00003 : Unifying failure: exploring the relationship between ejecta & spall*
11:30 AM–11:45 AM
Presenter:
Robin J Williams
(AWE)
Authors:
Matthew A Brown
(AWE)
Robin J Williams
(AWE)
Surface jetting, due to shock-induced Richtmyer-Meshkov Instability at a perturbed surface [1,2], will be sensitive to material several wavelengths deep below the free surface. Once shocked, rarefactions travelling back into the bulk material can significantly affect the structure of this sub-surface region, causing variations in density, temperature, solid/melt phase, while also potentially causing breakup and cavitation due to spall. Subsequent re-shocks will be shaped by this new structure, leading to variations in local shock strength and breakout time that can enhance breakup and failure of the surface. In this work we explore the sensitivities of this complex failure process, using 3D LES applied to typical experimental conditions and assemblies.
[1] R. D. Richtmyer, Commun. Pure Appl. Math., 13:297 (1960).
[2] E. E. Meshkov, Fluid Dyn. 4:101 (1969)
*UK Ministry of Defence © Crown Owned Copyright 2022/AWE
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