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    Large-eddy simulation of transitional flows using a co-located grid

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    Authors
    Langari, Mostafa
    Yang, Zhiyin cc
    Page, Gary J.
    Affiliation
    University of Sussex, Brighton, UK
    University of Derby, UK
    Issue Date
    2013-07-12
    
    Metadata
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    Abstract
    A large-eddy simulation (LES) of a transitional separated flow over a plate with a semi-circular leading at low (<0.2%) and high (5.6%) free-stream turbulence (FST) has been performed, using a co-located grid with the Rhie–Chow pressure smoothing. A numerical trip is used to produce a high FST level and a dynamic subgrid-scale model is also employed in the current study. The entire transition process leading to breakdown to turbulence has been shown clearly by the flow visualisations using instantaneous spanwise vorticities, and the differences between the low- and high-FST cases are clearly visible. Coherent structures are also visualised using isosurfaces of the Q-criterion, and for the high-FST case, the spanwise-oriented quasi-two-dimensional rolls, which are clearly present in the low-FST case, are not visible anymore. Detailed quantitative comparisons between the present LES results and experimental data and the previous LES results at low FST using a staggered grid have been done and a good agreement has been obtained, indicating that the current LES using a co-located grid with pressure smoothing can also predict transitional flows accurately.
    Citation
    Langari, Mostafa, Yang, Zhiyin, Page, Gary J., 'Large-eddy simulation of transitional flows using a co-located grid' 2013, 27 (4-5):189 International Journal of Computational Fluid Dynamics
    Publisher
    Taylor and Francis
    Journal
    International Journal of Computational Fluid Dynamics
    URI
    http://hdl.handle.net/10545/620641
    DOI
    10.1080/10618562.2013.799666
    Additional Links
    http://www.tandfonline.com/doi/abs/10.1080/10618562.2013.799666
    Type
    Article
    Language
    en
    ISSN
    1061-8562
    1029-0257
    ae974a485f413a2113503eed53cd6c53
    10.1080/10618562.2013.799666
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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