Fig. 1
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Comparison between (a) the vorticity, (b) the swirling strength, and (c) the Rortex criteria for a Lamb–Oseen vortex. Arrows indicate the velocity vector field of the Lamb–Oseen vortex and their length is proportional to the magnitude of the flow. The blue-dashed circles denote the boundary of the vortex defined by r = rmax.
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