Riblets incur a drag penalty in accelerating boundary layers from crest-localized viscous shear during relaminarization, with the outer flow scaling on groove shear stress until Kelvin-Helmholtz instabilities promote stronger retransition.
& K&7, J.1993 Direct numerical simulation of turbulent flow over riblets
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Drag penalty during relaminarization and Kelvin-Helmholtz-promoted retransition in an accelerating turbulent boundary layer over initially drag-reducing riblets
Riblets incur a drag penalty in accelerating boundary layers from crest-localized viscous shear during relaminarization, with the outer flow scaling on groove shear stress until Kelvin-Helmholtz instabilities promote stronger retransition.