Abstract
A scanning laser-Doppler velocimetric (LDV) system was used for detecting coherent structures in a turbulent boundary layer. This scanning LDV system gives instantaneous velocity profiles that enable uus to develop a new coherent structure detection technique based on the spatial structure of an event. This spatial detection was found to be relatively independent of threshold. A conditional sampling analysis based on the spatial size and location of low-speed structures indicated movement of the low-speed structure away from the wall corresponding to the movement of a high-speed structure toward the wall.
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