Velocity statistics and flow structures observed in bypass transition using stereo PTV

A. Inasawa, F. Lundell, M. Matsubara, Y. Kohama, P. H. Alfredsson

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    It is known from smoke visualizations that in a transitional boundary layer subjected to free-stream turbulence, streaks appear and eventually break down to turbulence after wavy motions. In order to observe the streaky structures directly, a stereo particle-tracking velocimetry system using hydrogen bubbles in a water channel has been developed and validated against laser Doppler velocimetry. Mean flow statistics show good agreement with previous results. With the developed measurement system, the instantaneous spanwise distribution of the streamwise and wall-normal velocities can be measured fast enough to resolve the time development of the streaky structures. Measurements of instantaneous spanwise distributions of the streamwise and wall-normal velocity disturbances show strong negative correlation between the wall-normal and streamwise velocities in the streaks.

    Original languageEnglish
    Pages (from-to)242-252
    Number of pages11
    JournalExperiments in Fluids
    Issue number2
    Publication statusPublished - 2003 Feb

    ASJC Scopus subject areas

    • Computational Mechanics
    • Mechanics of Materials
    • Physics and Astronomy(all)
    • Fluid Flow and Transfer Processes

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