This study presents experimental results on the effects of riblets on the coherent structures of turbulence within a turbulent spot. The riblet spacings of the study correspond to 0.5 and 1.5 times the natural spacing of the low-speed streak. The cross-sectional dimensions of the riblets were chosen to control the spatial distribution of wave packets consisting of streamwise-aligned hairpin vortices. Both riblet spacings demonstrated effective control on the spanwise positioning of the wave packets. The wider-spaced riblets reduced spanwise mutual interaction between wave packets. The closer-spaced riblets promoted this interaction via spanwise-oriented vortical structures which produced stronger turbulent fluctuations.
Measurements of the Effects of Streamwise Riblets on Boundary Layer Turbulence
Ottawa, ON K1S 5B6, Canada
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 9, 2016; final manuscript received May 10, 2017; published online August 11, 2017. Assoc. Editor: Daniel Maynes.
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Ancrum, D. B., and Yaras, M. I. (August 11, 2017). "Measurements of the Effects of Streamwise Riblets on Boundary Layer Turbulence." ASME. J. Fluids Eng. November 2017; 139(11): 111203. https://doi.org/10.1115/1.4037044
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