Impact of bulk viscosity on flow morphology of shock-accelerated cylindrical light bubble in diatomic and polyatomic gases

Shock-accelerated bubbles have long been an intriguing topic for understanding the fundamental physics of turbulence generation and mixing caused by Richtmyer–Meshkov instability. In this study, impact bulk viscosity on flow morphology a shock-accelerated cylindrical light bubble in diatomic polyatomic gases is investigated numerically. An explicit mixed-type modal discontinuous Galerkin scheme with uniform meshes employed to solve two-dimensional system unsteady physical conservation laws derived rigorously from Boltzmann–Curtiss kinetic equations. We also derive new complete viscous compressible vorticity transport equation including viscosity. The numerical results show that, during interaction between planar shock wave bubble, associated excess normal stress plays important role. cause significant changes morphology, resulting complex patterns, generation, vortex formation, deformation. contrast monatomic gases, produce larger rolled-up chains, various inward jet formations, large zones strong, large-scale expansion. effects are explored detail through phenomena such as degree nonequilibrium, enstrophy, dissipation rate. Furthermore, evolution trajectories interface features investigated. Finally, comprehensively analyzed.