In strongly decelerating turbulent boundary layers, riblets achieve far larger drag reductions than on flat plates, and in some cases produce a net upstream force, due to intensified KH rollers in the grooves.
Drag characteristics of V-groove and transverse curvature riblets,
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Attached Decelerating Turbulent Boundary Layers over Riblets
In strongly decelerating turbulent boundary layers, riblets achieve far larger drag reductions than on flat plates, and in some cases produce a net upstream force, due to intensified KH rollers in the grooves.