Kelvin–Helmholtz rollers in turbulent flow over riblets
AuthorEndrikat, S; Modesti, D; García-Mayoral, R; Hutchins, N; Chung, D
Source TitleProceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018
PublisherAustralasian Fluid Mechanics Society
University of Melbourne Author/sChung, Daniel; Hutchins, Nicholas; Endrikat, Sebastian; Modesti, Davide
Document TypeConference Paper
CitationsEndrikat, 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 StatusOpen Access
Open Access URLPublished version
ARC Grant codeARC/DP170102595
Structures resulting from a Kelvin–Helmholtz instability have been shown to contribute to skin-friction drag in turbulent flow over blade-shaped riblets . 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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