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    Numerical investigation of the near-field flow-structures produced by a pitched and skewed vortex generating jet.

    Access Status
    Fulltext not available
    Authors
    Jewkes, James
    Chung, Y.
    Date
    2011
    Type
    Conference Paper
    
    Metadata
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    Citation
    Jewkes, James W. and Chung, Yongmann M. 2011. Numerical investigation of the near-field flow-structures produced by a pitched and skewed vortex generating jet, in 7th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-7), Jul 28-31 2011. Ottawa, Canada: University of Ottawa.
    Source Title
    Proceedings of the 7th International Symposium on Turbulence and Shear Flow Phenomena
    Source Conference
    TSFP7: the 7th International Symposium on Turbulence and Shear Flow Phenomena.
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/4646
    Collection
    • Curtin Research Publications
    Abstract

    A large-eddy simulation of a velocity-ratio (VR = 1:0), pitched and skewed vortex generating jet issuing into a turbulent boundary layer (Red = 2000) is presented. As the jet issues from the orifice, an asymmetrical counter-rotating vortex pair is produced, consisting of a strong primary vortex and a weaker secondary vortex. The secondary vortex quickly dissipates to leave the primary vortex, which persists farther downstream. The primary vortex replaces the near-wall region with higher momentum fluid, and is shown to be associated with improved skin friction downstream of the jet. This increase in skin friction has been previously shown to be associated with improved resistance to boundary-layer separation.

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