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    Numerical study of the primary instability in a separated boundary layer transition under elevated free-stream turbulence

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    Authors
    Langari, Mostafa
    Yang, Zhiyin cc
    Affiliation
    University of Sussex, Brighton, UK
    University of Derby, UK
    Issue Date
    2013-07-25
    
    Metadata
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    Abstract
    Numerical studies of laminar-to-turbulent transition in a separation bubble subjected to two free-stream turbulence levels (FST) have been performed using Large-Eddy Simulation (LES). Separation of the laminar boundary layer occurs at a curvature change over a plate with a semi-circular leading edge at Re = 3450 based on the plate thickness and the uniform inlet velocity. A numerical trip is used to produce the targeted free-stream turbulence levels and the decay of free-stream turbulence is well predicted. A dynamic sub-grid-scale model is employed in the current study and a good agreement has been obtained between the LES results and the experimental data. Detailed analysis of the LES data has been carried out to investigate the primary instability mechanism. The flow visualisations and spectral analysis of the separated shear layer reveal that the 2D Kelvin-Helmholtz instability mode, well known to occur at low FST levels, is bypassed at higher levels leading to earlier breakdown to turbulence.
    Citation
    Langari, M., Yang, Z. 'Numerical study of the primary instability in a separated boundary layer transition under elevated free-stream turbulence' 2013, 25 (7):074106 Physics of Fluids
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    URI
    http://hdl.handle.net/10545/620640
    DOI
    10.1063/1.4816291
    Additional Links
    http://scitation.aip.org/content/aip/journal/pof2/25/7/10.1063/1.4816291
    http://scitation.aip.org/content/aip/journal/pof2;jsessionid=q_e7ESabqj2dVx1vpVPzDNL2.x-aip-live-02
    Type
    Article
    Language
    en
    ISSN
    10706631
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4816291
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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