Turbulent Boundary Layer over a Ribleted Surface with Tandem Manipulators Using Surface Drag Balances

Nguyen, Viet-Dung; Dickinson, J. T.; Jean, Yves; Chalifour, Y.; Smaïli, Arezki; Pagé, A; Paquet, F.

doi:10.1007/978-94-009-2159-7_10

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Perry et al 1969;Antonia & Luxton 1971), drag balance (e.g. Nguyen et al 1990;, the combined use of the log-law and 'error in origin' (e.g. Perry & Joubert 1963), and extrapolation of the Reynolds shear stress uv (e.g.…”

Section: Wall Shear Stress -Implication For Self-preservationmentioning

confidence: 99%

The turbulent boundary layer over transverse square cavities

1999

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Laser-induced uorescence (LIF) and laser Doppler velocimetry (LDV) are used to explore the structure of a turbulent boundary layer over a wall made up of two-dimensional square cavities placed transversely to the flow direction. There is strong evidence of occurrence of outflows of fluid from the cavities as well as inflows into the cavities. These events occur in a pseudo-random manner and are closely associated with the passage of near-wall quasi-streamwise vortices. These vortices and the associated low-speed streaks are similar to those found in a turbulent boundary layer over a smooth wall. It is conjectured that outflows play an important role in maintaining the level of turbulent energy in the layer and enhancing the approach towards self-preservation. Relative to a smooth wall layer, there is a discernible increase in the magnitudes of all the Reynolds stresses and a smaller streamwise variation of the local skin friction coefficient. A local maximum in the Reynolds shear stress is observed in the shear layers over the cavities.

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Section: Wall Shear Stress -Implication For Self-preservationmentioning

confidence: 99%

The turbulent boundary layer over transverse square cavities

1999

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Bio‐Inspired Passive Drag Reduction Techniques: A Review

2015

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It was believed that fluid flow and the laminar to turbulent transition delay were more easily controlled on smooth surfaces until the discovery of the grooved shark skin surface that changed the whole idea of how smooth the surface should be to have high flow in submerged surfaces. Riblets have gained renewed interest in academic fields of study and in industry due to several advantages in manipulating the turbulence boundary layer. Drag reduction using small, longitudinally grooved surface provides up to 10 % lower energy consumption in several applications. This review provides an overview of the mechanism of drag reduction with riblets, the different geometries and types, and the latest developments in drag reduction riblet technology.

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