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Collision of two viscous vortex rings

Development of side-by-side collision of two viscous vortex rings. Starting from the (x,z)-plane, the rings travel in the positive y-direction and move towards the x = 0 plane, being attracted by mutual induction. Induced by the collision of the inner cores, vortex bridges are formed and the inner core strengths decrease while the circulation inside the bridges increases rapidly. Furthermore, during this process large gradients of vorticity appear, but they get annihilated by vortex diffusion. Eventually, the two rings are merged to a single yet disturbed vortex ring.