Head-On Collision of a Pair of Coaxial Circular Vortex Filament

英文摘要：

We consider the head-on collision of two coaxial vortex rings described as the motion of two circular vortex filaments under the localized induction approximation. We prove the existence of solutions to a system of nonlinear partial differential equations proposed by the author which exhibit head--on collision. We also give a necessary and sufficient condition for the initial configuration and parameters of the filaments for head-on collision to occur. Our results suggest that there exists a critical value $ γ_{\ast}>1 $ for the ratio $ γ$ of the absolute value of the circulations such that when $ γ\in [1,γ_{\ast}]$, two approaching rings will collide, and when $ γ\in (γ_{\ast},\infty) $, the ring with the larger circulation passes through the other and then separate indefinitely.