Abstract
In this study, time-resolved particle image velocimetry (PIV) was performed in wall-parallel planes to investigate both the time evolution of structures in the flow as well as the 3D spatio-temporal spectrum. In particular vortex signatures in wall-parallel planes were studied which were found to correspond closely with the signature of hairpin vortices found in wall-bounded shear flows. Considering the convection velocity of different streamwise-spanwise scale pairs calculated from the spatio-temporal spectrum, it was found that the average convection velocity of highly energetic scales in the range 1.5 < λx/δ < 5.0 and 0.5 < λz/δ < 1.0 was close to the convection velocity of the vortex signatures. Also, this range of wavelengths is similar in size to the streamwise-elongated structures around which these vortices often appear.
| Original language | English (US) |
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| State | Published - 2011 |
| Event | 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada Duration: Jul 28 2011 → Jul 31 2011 |
Other
| Other | 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 |
|---|---|
| Country/Territory | Canada |
| City | Ottawa |
| Period | 7/28/11 → 7/31/11 |
Bibliographical note
Funding Information:We would like to thank the Air Force Office of Scientific Research for their support of this research under award number #FA9550-09-1-0701.
Publisher Copyright:
© 2011 International Symposium on Turbulence and Shear Flow Phenomena TSFP. All rights reserved.