a1 Department of Engineering, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK
Experimental measurements of the three-dimensional (3D) velocity field in a moderate Reynolds number zero pressure-gradient boundary layer are presented. The measurements are analysed to produce 3D correlations and conditional averaging techniques are used to further elucidate the underlying structure. The results show clear evidence of vortex-packet-type structures and shed new light on the detailed 3D structure of such packets in a real zero pressure-gradient boundary layer.
(Received April 08 2010)
(Revised September 27 2010)
(Accepted December 03 2010)
(Online publication March 14 2011)