Small-scale turbulence characteristics of two-dimensional bluff body wakes

R.A. Antonia, Tongming Zhou, G.P. Romano

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    Measurements have been made in nominally two-dimensional turbulent wakes generated by five different bluff bodies. Each wake has a different level of large-scale organization which is reflected in different amounts of large-scale anisotropy. Structure functions of streamwise (u) and lateral (v) velocity fluctuations at approximately the same value of R-lambda, the Taylor microscale Reynolds number, indicate that inertial-range scales are significantly affected by the large-scale anisotropy. The effect is greater on v than u and more pronounced for the porous-body wakes than the solid-body wakes. In particular, 'relative' values of the scaling (or power-law) exponents indicate that the magnitude of the transverse exponents can exceed that of the longitudinal ones in the porous-body wakes. This is supported by the inertial-range behaviour of the spectra of u and v. The difference between the transverse and longitudinal exponents appears to depend on the large-scale anisotropy of the flow, as measured by the ratio of the variances of v and u and ratio of the integral length scales of v and u. The spanwise vorticity spectra are much less affected by the anisotropy than the spectra of u and v.
    Original languageEnglish
    Pages (from-to)67-92
    JournalJournal of Fluid Mechanics
    Volume459
    DOIs
    Publication statusPublished - 2002

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