Computational Modeling of Experimental Richtmyer-Meshkov Instabilities in Copper

Technical Report · Wed Sep 12 00:00:00 EDT 2012

DOI:https://doi.org/10.2172/1051073· OSTI ID:1051073

Reeve, Sam T. ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Computational modeling of explosively driven ejecta in copper done experimentally by Buttler et al. was performed using the computational fluid dynamics code PAGOSA. Four sets of sinusoidal perturbations of differing amplitude were shocked using high explosives (HE), forming Richtmyer-Meshkov instabilities (RMI). These instabilities transformed the peaks and troughs of the perturbations into "spikes" and "bubbles" moving at velocities dependent on the initial size of the perturbations. These velocity profiles were the main method of comparing the models to experiment. Relevant variables in modeling the experiments included the length scale of the code, the flyer plate velocity or amount of HE, the ratio of copper to HE, and the strength model used. The best current models in this ongoing work include a flyer plate approximation and an area approximation of the HE using only TNT in the HE lens.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1051073
• Report Number(s): LA-UR--12-24698
• Country of Publication: United States
• Language: English

Related Subjects

Material Science
Materials Science(36)