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SUMMARY:Large scale structures of high Reynolds number turbulent boundary 
 layers - Tutkun\, M (Norwegian Defense Research Establishment)
DTSTART:20080911T132000Z
DTEND:20080911T134000Z
UID:TALK13375@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Time-resolved measurements from the European Wallturb consorti
 um experiment conducted using the large Laboratoire de Mecanique de Lille 
 (LML) wind tunnel at Lille\, France are reported. Data were taken at Re_th
 eta = 9\,800 and 19\,100. Data were obtained using a rake of 143 single ho
 t-wires which were spaced logarithmically across the flow in the spanwise 
 and vertical directions over a distance approximately equal to the boundar
 y layer thickness of 0.3 m. The wires were calibrated in situ using data f
 rom the simultaneous PIV experiment in a plane just upstream of the wire. 
 Other PIV planes were also recorded in synch with the hot-wire data acquis
 ition. This paper reports the cross-correlations and spectra generated amo
 ng the wires themselves and those generated the upstream PIV plane immedia
 tely upstream of the rake. The existence of very long elongated structures
  are also shown by the space-time correlations obtained using the hot-wire
  rake data. Proper orthogonal decomposition (POD) applied on the same how-
 wire rake data are found to be very efficient in term of energy such that 
 only a few spanwise wavenumber modes are necessary to capture 90% of the e
 nergy\, and the details POD results like eigenspectra and eigenfunctions a
 re discussed in the paper.
LOCATION:Seminar Room 1\, Newton Institute
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