Numerical Investigation on the Oblique Shock and High-speed Vortex Rings Interaction

Abstract

A wedge-shaped micro vortex generator is placed on a flat plate over which a turbulent boundary layer at Mach number 2.5 is developed. The interaction between an oblique shock wave and high-speed vortex rings in the MVG controlled ramp flow is investigated by using a high order implicit large eddy simulation with the fifth order bandwidth optimized WENO scheme. The vortical structures are visualized using the Omega identification method proposed by UTA researchers. By tracking several typical vortex rings before, when and after they pass through the shock front, the quantitative changes of flow properties are studied in detail. It shows that the spanwise vorticity takes a leading role in flow propagation, the reflection shock gets distorted when hit by rings and recovers quickly afterwards, and a number of weak shocks exist around the vortex rings due to the shock ring interaction.