Numerical investigation of the interaction between a converging shock wave and an offset cylindrical bubble containing different gases

A numerical study investigating the interaction process between a converging shock wave and gas bubble placed at an offset location is presented. As first step, for proofing reliability of used scheme, simulation relevant available experimental findings Hosseini Takayama [“Richtmyer–Meshkov instability induced by cylindrical loading gaseous inhomogeneities,” AIAA Paper No. 2000-2464, 2000] [“Study with interfaces in eccentric arrangement,” Japanese Symposium on Shock Waves, conducted; tested gases were helium (He) sulfur hexafluoride (SF6). The had Mach number 1.18 prior to its impact 50 mm diameter bubble. Achieving good agreement ensures applied scheme. After impacted bubble, different waves are created. These propagate differently than those observed case planar impacting or that where located center. Furthermore, once converged, diverging expands again impacts remaining thus creating more complex patterns. contained inside has effect focus point. In heavy SF6, point near center wave, but light He, it from outside initial He new results current include detailed both bubbles, which not reported 2000]. addition, focusing transmitted SF6 observed. This later creates secondary wave. Higher pressure achieved case.