Organised motions in turbulent boundary layers over a wide range of Reynolds number

Abstract

The motivation behind this paper comes from the large-scale coherence that has been recently reported in the near-wall and logarithmic regions of wall-bounded turbulent flows. Associated with these are inclined vortical structures that populate the near-wall region. Most often these inclined structures have been inferred as hairpin shaped vortices that have been observed experimentally and evidenced using conditional averaging and two-point correlations. The objective of this study is to analyse three-component velocity fields and determine the instantaneous three-dimensional structure around these large-scale coherent motions and their concurrent existence in the laboratory and the neutral ..