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Influence of riblet geometry on fatigue life of surface structured AA 2024 thin sheets
International Journal of Fatigue, 2014 Fatigue testing was performed on riblet structured AA 2024 T351 thin sheets. Main focus was put on the influence of different riblet geometries on fatigue life in the very high cycle fatigue (VHCF) regime.
T Beck
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Numerical investigation of V-shaped riblets and an improved model of riblet effects
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2017Symmetric V-shaped riblets are simulated by using the computational fluid dynamic method to understand the riblet effects on the turbulent boundary layer and the skin friction reduction. Three classical turbulence models, namely Spalart–Allmaras, shear stress transport, and re-normalization group k-epsilon models, are investigated under different grid ...
Yu Yang, Zhang Ming-Ming, Li Xue-Song
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Coherent structures and riblets
Applied Scientific Research, 1995We study the effect of the riblets on the coherent structures near the wall. The emphasis is put on the genesis of the quasi-streamwise vortices in the presence of the riblets. The quasi-streamwise vortices regenerate by the tilting of wall normal vorticity induced by prevailing structures. This requires a mechanism which leads to a temporal streamwise
Tardu, Sedat F., Tardu, Sedat, F.
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The effect of riblets on sails
Experiments in Fluids, 1995This paper describes an experimental investigation into the effect of riblets on the aerodynamic forces generated by sails. Riblets are known to reduce the viscous drag on flat surfaces and on airfoils, but their effect on the drag — or on the lift — of a highly three-dimensional, very thin lifting surface such as a sail is unknown.
A. E. Alving, P. Freeberg
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Flow, Turbulence and Combustion, 1998
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Drag Reduction in Pipes Lined with Riblets
AIAA Journal, 1990In the present paper, experiments are reported establishing a maximum drag reduction of five to seven percent in fully developed turbulent flow of water through 25.4mm and 50.8mm diameter pipes lined with a film of grooved equilateral triangles of base 0.11mm. The maximum reduction occurs when the height of the riblets is 11 to 16 wall units.
K. N. Liu +3 more
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Grinding of Riblets on Curved Paths
Materials Science Forum, 2016The grinding of riblets with multiple profiled grinding wheels is an efficient method to minimize the fluid friction on surfaces. In turbo machinery components, like pump impellers or compressor blades, the riblets must be ground with a curved tool path since the flow is rarely linear on such surfaces.
Berend Denkena, Thilo Grove, Jan Harmes
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1989
Riblets are little groves dug on the surface of flying or swimming solid bodies in order to reduce their drag. Why riblets work is not known but it is believed that it is a turbulent process because they trap the main eddies that develop near the solid body surfaces.
O. Pironneau, G. Arumugam
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Riblets are little groves dug on the surface of flying or swimming solid bodies in order to reduce their drag. Why riblets work is not known but it is believed that it is a turbulent process because they trap the main eddies that develop near the solid body surfaces.
O. Pironneau, G. Arumugam
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Secondary flow induced by riblets
Journal of Fluid Mechanics, 1998The effects of riblets on one wall of a channel bounding fully developed turbulent flow are investigated. Various perturbation elements including wires, fins and slots are modelled in order to understand the effects of riblets. It is found that widely spaced riblets, fins and wires create a substantial increase in turbulent activity just above ...
Goldstein, D. B., Tuan, T.-C.
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Riblet drag at flight conditions
Journal of Aircraft, 1989This paper describes perforated and nonperforated riblet tests on the fuselage of a modified Learjet model 28/29 twin-engine business jet at Reynolds numbers of 1.0-2.75 x 10/ft and Mach numbers of 0.3-0.7. Drag reductions of the order of 6% at nondimensional wall spacings of 12 were obtained using boundary-layer rakes and direct drag balances.
Michael J. Walsh +2 more
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