Second Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP2
THE SMALL-SCALE STRUCTURE OF ACCELERATION IN TURBULENT CHANNEL FLOW
pages 21-26
DOI: 10.1615/TSFP2.30
ABSTRAKT
Temporal and convective derivatives of velocity are computed from time-resolved particle-image velocimetry data in the streamwise-wall-normal plane of turbulent channel flow. Advection of the small-scale vortices embedded within the flow dominates the small-scale behavior of the velocity time-derivative; however, in a reference frame traveling with the vortices, a marked deceleration represents the evolution of the flow. This large-scale deceleration is conjectured to be the dynamic influence of larger-scale vortices present further away from the wall on the smaller-scale vortices present closer to the wall.