Abstract
Correlation between simultaneous visual pattern of coherent motion and fluctuating components of velocity in the near-wall turbulent flow is investigated using ‘dyeparticle-image velocimetry’ technique. The results indicate that the dye-streak pattern of coherent motion associates with the transversal vortical structure in the head of wall streamwise vortices', large-scale sweep event and large-scale ejection event.DPIV technique plays an important role to understand the physics of coherent motionin the near-wall turbulence.
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