Abstract

Using a vortex-in-cell method, the interactions of two identical rings moving on a collision course along parallel lines are studied. Evolution of a passive nondiffusing scalar carried initially with the vortices is visualized and analyzed. Diagnostics of mixing of the scalar particles demonstrate an improvement in mixing as the offset of the lines of propagation of the vortices is increased from zero to about a quarter of the ring diameter. With further increase of the offset the mixing is gradually reduced due apparently to a vortex reconnection process that limits the amount of stretching of the configuration.

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