Understanding The Shallow Bubble Collapse Mechanism with Resolved 2D and 3D Hydrodynamic Computations

Recent experiments have demonstrated that, under certain shock conditions, the Shallow Bubble Collapse (SBC) mechanism can produce ejecta with high areal masses (>300 mg/cm2) at elevated temperatures (>2500K) substantially above conditions observed for RMI ejecta. In this talk, we discuss methods for modeling SBC in 2D and 3D to understand the time evolution and structures. We show validation results for a series of experiments, as well as the sensitivity to modeling choices. We find that, while lower drive SBC experiments are relatively consistent with the experimental data, higher drives require additional model development. We also provide highlights from our computational SBC effort including recent GPU-accelerated 3D hydrodynamic calculations on the LLNL Lassen supercomputer.