Nonlinear saturation of bubble evolution in a two-dimensional single-mode stratified compressible Rayleigh-Taylor instability

For the compressible Rayleigh-Taylor instability (RTI), density stratification is found to cause different bubble behaviors for different Atwood number (At) values. We propose a modified buoyancy-drag model that interprets the physical mechanism causing these behaviors, and analyze the acceleration behavior of a bubble at high At in detail. This work provides a more comprehensive understanding of the compressibility effects on nonlinear evolution of RTI.