Conditional averages of large scale motions through synchronous PIV and surface shear stress measurements – Proceedings of the 13th International Symposium on Particle Image Velocimetry Jul 2019

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Synchronous stereo particle image velocimetry (PIV) and fluctuating wall shear stress measurements wereperformed in a moderate Reynolds number zero pressure gradient turbulent boundary layer. Multiple, dis-crete PIV planes allow for a reconstruction of the wall shear stress-streamwise velocity cross correlation ina volume around the sensor. The velocity field is averaged on imposed conditions of the wall shear stressto identify large scale motions during these conditions. A simple condition based on large scale dynamicsis introduced to identify periodic patterns of the velocity field associated with wall-distance scaling. Thisstudy represents a novel application of microelectromechanical systems floating element wall shear stresssensor types simultaneously with PIV, and addresses experimental procedures to prevent degradation andsignal corruption caused by both seeded flow and laser radiation.

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