Three-dimensional conditional structure of a high-Reynolds-number turbulent boundary layer
N Hutchins, JP Monty, B Ganapathisubramani, HCH Ng, I Marusic
Journal of Fluid Mechanics | CAMBRIDGE UNIV PRESS | Published : 2011
An array of surface hot-film shear-stress sensors together with a traversing hot-wire probe is used to identify the conditional structure associated with a large-scale skin-friction event in a high-Reynolds-number turbulent boundary layer. It is found that the large-scale skin-friction events convect at a velocity that is much faster than the local mean in the near-wall region (the convection velocity for large-scale skin-friction fluctuations is found to be close to the local mean at the midpoint of the logarithmic region). Instantaneous shear-stress data indicate the presence of large-scale structures at the wall that are comparable in scale and arrangement to the superstructure events tha..View full abstract
Awarded by Australian Research Council
N.H., J.P.M. and I.M. acknowledge support from the Australian Research Council through grants DP0663499, FF0668703, DP0984577 and DP1093585. B. G. acknowledges the Royal Society for the travel grant that enabled his visit to the University of Melbourne. We also wish to thank the reviewers for their helpful comments.