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
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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