Effect of freestream conditions on the far wake of a circular cylinder

John Michael Cimbala, Mark V. Krein

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Hot-wire anemometry was incorporated to measure the frequency spectra at various downstream locations in the wake of a two-dimensional circular cylinder at a Reynolds number of 1.4 × 10. Two different freestream conditions were imposed on the wake to study the dependence of the wake spectra on background noise. The prominent frequencies observed in the wake showed significant dependence on freestream conditions. Moreover, all of the spectral peaks could be identified as sums or differences between the Karman frequency and prominent freestream frequencies or their harmonics or sums or differences between two or more prominent freestream peaks independent of Karman frequency. This implies that the far-wake structures arise due to hydrodynamic instability of the wake and that the associated frequencies of these structures are dependent on nonlinear interactions between the existing wake structures and disturbances in the freestream.

    Original languageEnglish (US)
    Pages (from-to)1369-1373
    Number of pages5
    JournalAIAA journal
    Volume28
    Issue number8
    DOIs
    StatePublished - Jan 1 1990

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    Circular cylinders
    Reynolds number
    Hydrodynamics
    Wire

    All Science Journal Classification (ASJC) codes

    • Aerospace Engineering

    Cite this

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    abstract = "Hot-wire anemometry was incorporated to measure the frequency spectra at various downstream locations in the wake of a two-dimensional circular cylinder at a Reynolds number of 1.4 × 10. Two different freestream conditions were imposed on the wake to study the dependence of the wake spectra on background noise. The prominent frequencies observed in the wake showed significant dependence on freestream conditions. Moreover, all of the spectral peaks could be identified as sums or differences between the Karman frequency and prominent freestream frequencies or their harmonics or sums or differences between two or more prominent freestream peaks independent of Karman frequency. This implies that the far-wake structures arise due to hydrodynamic instability of the wake and that the associated frequencies of these structures are dependent on nonlinear interactions between the existing wake structures and disturbances in the freestream.",
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    Effect of freestream conditions on the far wake of a circular cylinder. / Cimbala, John Michael; Krein, Mark V.

    In: AIAA journal, Vol. 28, No. 8, 01.01.1990, p. 1369-1373.

    Research output: Contribution to journalArticle

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