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A New Look at the Near-Wall Turbulence Structure

  • Kwing-So Choi

Abstract

An experiment was carried out in the BMT environmental wind tunnel (4.8m × 2.4m × 15m) in order to study the near-wall structure of the turbulent boundary layer, particular attention being given to the dynamics of the “near-wall bursts” [1]. Conditional samping of the wall-shear stress fluctuations was extensively used along with a simultaneous application of flow visualisation using a streak-smoke wire and a sheet of laser light. The results suggested that a “near-wall burst” was taking place between a pair of smoke tubes, which was interpreted as a pair of stretched legs of neighbouring hairpin loops. The spanwise spacing of the “near-wall bursts” determined from a conditional space correlation of skin-friction signals was found to be a function of the threshold value used in burst detection.

Keywords

Turbulent Boundary Layer Flow Visualisation Wall Unit Burst Detection Flow Visualisation Study 
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.

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • Kwing-So Choi
    • 1
  1. 1.Applied Fluid Mechanics DivisionBritish Maritime Technology Ltd.Teddington, MiddlesexUK

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