Results 161 to 170 of about 1,669 (212)

Drag reduction in a turbulent boundary layer with sinusoidal riblets [PDF]

Experimental Thermal and Fluid Science, 2022
We report on an experimental investigation on the effect of sinusoidal riblets on the near-wall characteristics of a turbulent boundary layer. The investigated riblets are characterized by a fixed wavelength and two different values of the amplitude.
Gioacchino Cafiero, Gaetano Iuso
exaly   +2 more sources

Drag bookkeeping on an aircraft with riblets and NLF control

Aerospace Science and Technology, 2020
In the frame of aerodynamic drag reduction for low-emission target, Natural Laminar Flow (NLF) control and riblets are the most interesting passive techniques.
Benedetto Mele, Lorenzo Russo, Renato Tognaccini   +2 more
exaly   +2 more sources

Direct numerical simulation of heat transfer over riblets

International Journal of Heat and Fluid Flow, 2003
Riblets are well-known as a passive mean for drag reduction in turbulent flow conditions, but their effectiveness for heat transfer is quite controversial.
E Stalio, Enrico Nobile
exaly   +2 more sources

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The Influence of Process Parameters on the Forming of Riblets during Riblet Rolling

Key Engineering Materials, 2014
In aeronautics, economic and environmental aspects become increasingly important. As those are very much influenced by the frictional drag of the airplane, a reduction of skin friction which causes a major portion of total aerodynamic drag is desirable.
Julia Pöplau, Sebastian Stille, Thijs Romans, Tilmann Beck, Lorenz Singheiser, Gerhard Hirt   +5 more
openaire   +1 more source

Analyses of Non Local Effects of Riblets

Aerotecnica Missili & Spazio, 2016
The paper deals with the effects of pressure gradient and shock wave on riblet performance. A model for the numerical simulations of riblets at high Reynolds numbers is presented and results of airfoil flows in subsonic and transonic conditions are discussed and compared with available experiments.
MELE B, Tognaccini R, Catalano P
openaire   +2 more sources

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, 2017
Symmetric 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
openaire   +1 more source

Coherent structures and riblets

Applied Scientific Research, 1995
We 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.
openaire   +2 more sources

The effect of riblets on sails

Experiments in Fluids, 1995
This 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
openaire   +1 more source

Directional riblets as an airfoil passive flow control mechanism

International Journal of Heat and Fluid Flow
The effects of converging–diverging riblets (C–D riblets) on the surface of a flat-bottomed airfoil bump on the wind tunnel wall is investigated experimentally.
Zambri Harun, Wan Aizon W Ghopa, B Nugroho   +2 more
exaly   +2 more sources

Natural Low-Frequency Riblets

Flow, Turbulence and Combustion, 1998
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source