Evolution of coherent structures in turbulent boundary layers based on moving tomographic PIV

Evolution of coherent structures in turbulent boundary layers based on moving tomographic PIV A moving tomographic particle image velocimetry method was designed and implemented to measure temporal evolution of velocity fields in three-dimensional volumes and to track coherent structures within a turbulent boundary layer with Re τ ≈ 2,410. The evolution of hairpin structures and eddy packets was examined at two locations in the logarithmic region: z + = 100–300 and 300–500. Meandering, merging and breaking of long slow regions associated with packets were observed. The meandering of long slow regions at both wall-normal locations was tracked using cross-correlation between neighboring time steps. It was found that long slow regions could persist within the logarithmic region over a travel distance of 15δ corresponding to a time period 24.3δ/U ∞ (t + > 2,300) and that the packet regions could travel stably forward in the streamwise direction while maintaining fixed spanwise inclinations in the range 0°–10°. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Evolution of coherent structures in turbulent boundary layers based on moving tomographic PIV

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Springer Berlin Heidelberg
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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