passes through the next, whose radius decreases while the velocity increases. The radius of the next vortex increases and the velocity decreases. The first ring moves through the second. The process is then [...] using the finite volume method (OpenFOAM) and the computational vortex element method (CVM). The inviscid CVM reproduces this process for a longer time. The numerical diffusion in FVM transforms the two [...] self-induction, the rings move towards each other. Due to the mutual influence, they grow. In frictionless flow, this process continues until convective instability destroys the vortices. The motion is modeled
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