One mechanism by which laminar flow becomes turbulence is through the instability of vortex interaction.The nonlinear evolution of the interactions between the∧-vortex and the secondary closed vortex has been investigated.This nonlinear instability process leads to some fundamental changes in the topology of flows.Experimental observations are presented here,showing the formation of a chain of ring-like vortices,which generate high frequency spikes on time traces in a transitional boundary layer.
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