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Experiments in Fluids

, 54:1625 | Cite as

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

  • Qi GaoEmail author
  • Cecilia Ortiz-Dueñas
  • Ellen K. Longmire
Research Article

Abstract

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°.

Keywords

Turbulent Boundary Layer Streamwise Velocity Spanwise Direction Tomographic Particle Image Velocimetry Multiplicative Algebraic Reconstruction Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was supported by the National Science Foundation under Grant Number CTS-0324898. We gratefully acknowledge the Graduate School of the University of Minnesota for providing the first author with a Doctoral Dissertation Fellowship. The first author would also like to thank the National Natural Science Foundation of China (Grant Number: 11102013) for support during the analysis portion of this study.

Supplementary material

AVI (3734 KB)

AVI (2206 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Qi Gao
    • 1
    Email author
  • Cecilia Ortiz-Dueñas
    • 2
  • Ellen K. Longmire
    • 2
  1. 1.Key Laboratory of Fluid Mechanics, Ministry of EducationBeijing University of Aeronautics and AstronauticsBeijingChina
  2. 2.Department of Aerospace Engineering and MechanicsUniversity of MinnesotaMinneapolisUSA

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