Backwards and forwards relative dispersion in turbulent flow: An experimental investigation

J. Berg, B. Lüthi, J. Mann, Søren Ott

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    Abstract

    From particle tracking velocimetry we present an experimental measure of the ratio between backwards and forwards relative dispersion in an intermediate Reynolds number turbulent flow. Lack of time-reversal symmetry implies that their ratio may be different from 1. From a stochastic model, this has recently been studied by Sawford [Phys. Fluids 17, 095109 (2005)] giving ratios between 5 and 20. We find a value of approximately 2 and discuss it in the context of the characteristics of the rate of strain tensor s(ij). An analysis of a direct numerical simulation by Biferale [Phys. Rev. Lett. 93, 064502 (2004) and Phys. Fluids 17, 021701 (2004)] gives the same result.
    Original languageEnglish
    JournalPhysical Review E
    Volume74
    Issue number1
    Pages (from-to)016304
    Number of pages7
    ISSN2470-0045
    DOIs
    Publication statusPublished - 2006

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