期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 48, 期 -, 页码 43-51出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2014.04.006
关键词
Wall turbulence; Roughness; Superstructures; Particle-image velocimetry
资金
- Air Force Office of Scientific Research [FA9550-05-1-0043, FA9550-07-1-0129]
The existence of meandering superstructures in a turbulent boundary layer overlying irregular roughness is explored with high-frame-rate particle-image velocimetry measurements within the roughness sub-layer at moderate Reynolds number. Elongated streamwise fields of view reconstructed from this data using a Taylor's hypothesis approach revealed spanwise-meandering regions of low-streamwise-momentum fluid that extended several boundary-layer thicknesses in the streamwise direction. Such signatures are consistent with previous observations of superstructures in smooth-wall turbulence. Counter-rotating wall-normal vortex cores were found to reside along the spanwise boundaries of these superstructure patterns, consistent with the spatial characteristics of hairpin vortex packets. (C) 2014 Elsevier Inc. All rights reserved.
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