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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

THE SMALL-SCALE STRUCTURE OF ACCELERATION IN TURBULENT CHANNEL FLOW

pages 21-26
DOI: 10.1615/TSFP2.30
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摘要

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.

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