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    Separated boundary layer transition under pressure gradient in the presence of free-stream turbulence

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    PoF_2019_ZY_pre-print.pdf
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    Authors
    Li, Huajun
    Yang, Zhiyin
    Affiliation
    University of Derby
    University of Sussex
    Issue Date
    2019-10-14
    
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    Abstract
    Large-eddy simulation (LES) has been carried out to investigate the transition process of a separated boundary layer on a flat plate. A streamwise pressure distribution is imposed to mimic the suction surface of a low-pressure turbine blade, and the free-stream turbulence intensity at the plate leading edge is 2.9%. A dynamic subgrid scale model is employed in the study, and the current LES results compare well with available experimental data and previous LES results. The transition process has been thoroughly analyzed, and streamwise streaky structures, known as the Klebanoff streaks, have been observed much further upstream of the separation. However, transition occurs in the separated shear layer and is caused by two mechanisms: streamwise streaks and the inviscid K-H instability. Analysis suggests that streamwise streaks play a dominant role in the transition process as those streaks severely disrupt and break up the K-H rolls once they are formed, leading to significant three-dimensional (3D) motions very rapidly. It is also demonstrated in the present study that the usual secondary instability stage under low free-stream turbulence intensity where coherent two-dimensional (2D) spanwise rolls get distorted gradually and eventually broken up into 3D structures has been bypassed.
    Citation
    Li, H.J. and Yang, Z., (2019). 'Separated boundary layer transition under pressure gradient in the presence of free-stream turbulence'. Physics of Fluids, 31(10), pp, 1-14. DOI: 10.1063/1.5122889.
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    URI
    http://hdl.handle.net/10545/624251
    DOI
    10.1063/1.5122889
    Additional Links
    https://doi.org/10.1063/1.5122889
    https://aip.scitation.org/doi/pdf/10.1063/1.5122889?class=pdf
    Type
    Article
    Language
    en
    ISSN
    10706631
    EISSN
    10897666
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5122889
    Scopus Count
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    Department of Mechanical Engineering & the Built Environment

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