Vortex bursting on a vortex tube with initial core-size perturbations

When a straight vortex tube is endowed with core-size perturbations, the differential rotation along the tube leads to the tilting of vortex lines and formation of twist waves. The waves propagate and collide, resulting in a drastic expansion of the vortex core and the formation of an annular structure with high azimuthal vorticity, a process known as vortex bursting. In this talk we examine vortex bursting using numerical simulations on straight vortex tubes with initial perturbations. We investigate the early twist generation, the bursting intensity, and the late-time flow evolution including secondary bursting phenomena along the tube. Further, we analyze the effect of Reynolds number and initial perturbation amplitude on the flow evolution and discuss possible vortex bursting related instabilities in vortical structures beyond straight tubes.