Abstract
The vortex merging influences both flow evolution and particles motion. With a blobs‐splitting‐and‐merging scheme, the vortex merging is calculated by using discrete vortex method; and the particles motion in vortex merging process are calculated according to the particle kinetic model. As the results indicate, the particle traces are spiral lines, keeping the same rotation direction with the spinning vortex; the center of particles group is in agreement with that of the merged vortex; the merging time is determined by the circulation and initial ratio of the vortex radius and vortex center distance; and in a certain initial condition, a stretched particle trail is generated, which is determined by the viscosity, the relative position between particles and vortex, and the unsymmetrical circulation of the two merging vortex.
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