On the Evolution of Shear-Layer Structures in Near-Wall Turbulence
Lift-up of low-speed fluid from the viscous sublayer creates shear-layer structures in the buffer region, that have been shown to be dynamically important for the generation of turbulence in wall-bounded flows. The present experiments, carried out in the Göttingen oil channel, focus on the evolution of shear-layers, by means of two-probe measurements in the buffer region of turbulent channel flow. Various separations in the streamwise and normal directions were used to obtain data on the inclination angles and progation velocity of the shear-layer, as well as the coherence of the flow structure.
KeywordsMigration Coherence Vorticity Advection
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