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

Numerical analysis of a pressure wave generated in a liquid Pb 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 Pb 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 Pb 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/s, while at lower velocities of 10m/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 compressible InterFoam within OpenFOAM.

Pressure waves ; nonlinear acoustics ; impact dynamics ; multiphase flow Read More: https://www.worldscientific.com/doi/abs/10.1142/S1758825117500375

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