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Pressure Wave in Liquid Generated by Pneumatic Pistons and Its Interaction with a Free Surface

Abstract

Numerical analysis of a pressure wave generated in a liquid PbPb upon impact of the pneumatic pistons and its interaction with a free surface has been performed for the geometry and parameters of the plasma compression system prototype constructed by General Fusion Inc. Stress wave developing in the hammer–anvil piston assembly is first simulated using high-fidelity structural mechanics research code, then propagated through the liquid PbPb with several solvers within OpenFOAM®® software and also with nonlinear acoustics in-house code based on the Westervelt equation. In the current system, a pressure wave transmitted into the liquid PbPb is characterized by a complex temporal double peak structure and strong spatial amplitude variation. An imprint of discrete pulses remains detectable during the entire propagation of the combined wave. An excellent agreement between the results produced with different numerical codes is obtained. Nonlinear effects associated with equation of state are found to be significant at impact velocities of 50m/s50m/s, while at lower velocities of 10m/s10m/s the difference between the results obtained with linear and nonlinear equations of state is negligible. Liquid–gas interface dynamics during the compression process of a spherical gas cavity is captured very well by the compressibleInterFoam within OpenFOAM.

V. Suponitsky, D. Plant, E. J. Avital and A. Munjiza, 2017. Pressure Wave in Liquid Generated by Pneumatic Pistons and Its Interaction with a Free Surface. International Journal of Applied Mechanics, volume 9, issue 3. doi: 10.1142/S1758825117500375

 

Licence information
This is a pre-copyedited, author-produced version of an article accepted for publication in the International Journal of Applied Mechanics following peer review.
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© 2017 International Journal of Applied Mechanics and Imperial College Press.