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    A comparative study of separated boundary layer transition on a flat plate with a blunt/semi-circular leading edge

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    Authors
    Yang, Zhiyin cc
    Affiliation
    University of Derby
    Issue Date
    2011-07
    
    Metadata
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    Abstract
    Boundary layer may separate due to an adverse pressure gradient or due to flow geometry and when a laminar boundary layer separates the free shear layer formed is very unstable even at low Reynolds number, undergoing a transition process to turbulence. This paper presents a comparative numerical study of the transition process in a separated boundary layer induced by changes of curvature of the surface. The geometry is a flat plate with two different leading edges: a blunt and a semi-circular. One of the main purpose of the study is to identify how similar or how different the transition process is with two different leading edges. It is evident that for both cases (blunt and semi-circular leading edges) the primary two-dimensional instability originates from the free shear layer of the separation bubble via the Kelvin-Helmholtz mechanism. Three-dimensional motions develop under any small spanwise disturbances and similar coherent structures have been observed in both cases, strongly indicating that the whole transition process is very similar.
    Citation
    Yang, Zhiyin (2011) A comparative study of separated boundary layer transition on a flat plate with a blunt/semi-circular leading edge. In: Recent Researches in Mechanics. WSEAS press, pp. 191-195. ISBN 978-1-61804-020-6
    Publisher
    World Scientific and Engineering Academy and Society (WSEAS)
    URI
    http://hdl.handle.net/10545/620671
    Additional Links
    http://www.wseas.us/books/2011/Corfu/CUTAFLUP.pdf
    http://www.wseas.org/wseas/cms.action?id=2741
    Type
    Book chapter
    Language
    en
    ISBN
    9781620000000
    Collections
    Department of Mechanical Engineering & the Built Environment

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