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    Kelvin–Helmholtz rollers in turbulent flow over riblets

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    Author
    Endrikat, S; Modesti, D; García-Mayoral, R; Hutchins, N; Chung, D
    Date
    2018-01-01
    Source Title
    Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018
    Publisher
    Australasian Fluid Mechanics Society
    University of Melbourne Author/s
    Chung, Daniel; Hutchins, Nicholas; Endrikat, Sebastian; Modesti, Davide
    Affiliation
    Mechanical Engineering
    Metadata
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    Document Type
    Conference Paper
    Citations
    Endrikat, S., Modesti, D., García-Mayoral, R., Hutchins, N. & Chung, D. (2018). Kelvin–Helmholtz rollers in turbulent flow over riblets. Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018, Australasian Fluid Mechanics Society.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252857
    Open Access URL
    http://people.eng.unimelb.edu.au/imarusic/proceedings/21/Contribution_586_final.pdf
    ARC Grant code
    ARC/DP170102595
    Abstract
    Structures resulting from a Kelvin–Helmholtz instability have been shown to contribute to skin-friction drag in turbulent flow over blade-shaped riblets [4]. Using Direct Numerical Simulation (DNS) data, the present survey of several different riblet shapes reveals that the contribution to wall-shear stress due to the Kelvin–Helmholtz instability depends on riblet shape, in addition to a previously known dependence on riblet size. For a given drag change, sharp triangular and blade riblets promote development of the instability whilst blunt triangular and trapezoidal riblets appear to suppress it.

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