TY - GEN
T1 - The spikes from Richtmyer-Meshkov instabilities in pulsed power cylindrical experiments
AU - Freeman, Matthew S.
AU - Rousculp, Chris
AU - Oro, David
AU - Kreher, Seth
AU - Cheng, Baolian
AU - Griego, Jeffrey
AU - Patten, Austin
AU - Neukirch, Levi
AU - Reinovsky, Robert
AU - Turchi, Peter
AU - Bradley, Joseph
AU - Reass, William
AU - Fierro, Franklin
AU - Randolph, Randall
AU - Donovan, Patrick
AU - Saunders, Alexander
AU - Mariam, Fesseha
AU - Tang, Zhaowen
N1 - Publisher Copyright:
© 2018 Author(s).
PY - 2018/7/3
Y1 - 2018/7/3
N2 - The LANL PHELIX pulsed-power driven liner implosion apparatus is fielded to measure the growth of Richtmyer-Meshkov instabilities (RMIs) in a cylindrical geometry under the conditions of liquid (Cren-1), mixed-state (Cren-2), and solid (Cren-3) release. 2D Lagrangian hydrocode simulations of this imploding geometry are compared against 800-MeV proton radiography data of the RMI growth. The liquid release (>35 GPa) was achieved with a liner velocity of 3 km s-1, and demonstrates a linear, continuous spike growth that agrees with the model. The mixed release (20 - 35 GPa) was achieved with a liner velocity of 1.4 km s-1 and demonstrates growth stagnation with time, due to increased transit time effects. The solid release (<20 GPa), achieved with a liner velocity of 0.8 km s-1, also demonstrates growth stagnation, while also showing an effect not predicted by the model, in that some peaks, at late time, disappear completely, while other, central, peaks, grow disproportionately large, due to RMI bubble merger behavior. These experiments demonstrate a broad parameter space in which to study RMIs in a cylindrical geometry, and a rich dataset against which to validate and inform future iterations of the simulation.
AB - The LANL PHELIX pulsed-power driven liner implosion apparatus is fielded to measure the growth of Richtmyer-Meshkov instabilities (RMIs) in a cylindrical geometry under the conditions of liquid (Cren-1), mixed-state (Cren-2), and solid (Cren-3) release. 2D Lagrangian hydrocode simulations of this imploding geometry are compared against 800-MeV proton radiography data of the RMI growth. The liquid release (>35 GPa) was achieved with a liner velocity of 3 km s-1, and demonstrates a linear, continuous spike growth that agrees with the model. The mixed release (20 - 35 GPa) was achieved with a liner velocity of 1.4 km s-1 and demonstrates growth stagnation with time, due to increased transit time effects. The solid release (<20 GPa), achieved with a liner velocity of 0.8 km s-1, also demonstrates growth stagnation, while also showing an effect not predicted by the model, in that some peaks, at late time, disappear completely, while other, central, peaks, grow disproportionately large, due to RMI bubble merger behavior. These experiments demonstrate a broad parameter space in which to study RMIs in a cylindrical geometry, and a rich dataset against which to validate and inform future iterations of the simulation.
UR - http://www.scopus.com/inward/record.url?scp=85049793122&partnerID=8YFLogxK
U2 - 10.1063/1.5044847
DO - 10.1063/1.5044847
M3 - Conference contribution
AN - SCOPUS:85049793122
T3 - AIP Conference Proceedings
BT - Shock Compression of Condensed Matter - 2017
A2 - Knudson, Marcus D.
A2 - Brown, Eric N.
A2 - Chau, Ricky
A2 - Germann, Timothy C.
A2 - Lane, J. Matthew D.
A2 - Eggert, Jon H.
PB - American Institute of Physics Inc.
T2 - 20th Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2017
Y2 - 9 July 2017 through 14 July 2017
ER -