Results 181 to 190 of about 8,471 (240)
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AIP Conference Proceedings, 2020
The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets.
Mele B., Tognaccini R.
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The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets.
Mele B., Tognaccini R.
openaire +2 more sources
Wear, 2021
Cavitation can be formed on ship rudders, ship propellers and hydraulic system components and can induce erosion on solid surfaces. One of the remaining open questions in the study of the cavitation erosion is finding a method to control erosion ...
Ebrahim Kadivar +3 more
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Cavitation can be formed on ship rudders, ship propellers and hydraulic system components and can induce erosion on solid surfaces. One of the remaining open questions in the study of the cavitation erosion is finding a method to control erosion ...
Ebrahim Kadivar +3 more
semanticscholar +1 more source
Effects of the Yaw Angle on Air Drag Reduction for Various Riblet Surfaces.
Langmuir, 2022Biomimetic riblet surfaces, such as blade, wavy, sinusoidal, and herringbone riblet surfaces, have widespread applications for drag reduction in the energy, transportation, and biomedicine industries.
ZiDan Zhou +6 more
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Experimental and Numerical Investigation of Bio-Inspired Riblet for Drag Reduction
Journal of Fluids Engineering, 2022Flow alteration using the bio-inspired riblet structure is a fascinating field of study resulting in drag benefits. Riblets have no power requirement being a passive method. The present work aims to study the effect of riblets on flow and drag behavior
Vikas Sharma, S. Dutta
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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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Experimental characterisation of Kelvin–Helmholtz rollers over riblet surfaces
Journal of Fluid MechanicsThe formation of Kelvin–Helmholtz-like rollers (referred to as K–H rollers) over riblet surfaces has been linked to the drag-increasing behaviour seen in certain riblet geometries, such as sawtooth and blade riblets, when the riblet size reaches ...
W. Abu Rowin +6 more
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A vorticity-based model relating herringbone riblet geometric parameters to induced vorticity
The Physics of FluidsPrevious numerical and experimental parametric studies of the yaw angle and wavelength of the herringbone riblets have been carried out to understand the evolution of a pair of induced counter-rotating vortices.
Zhiping Li +6 more
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Analyses of Non Local Effects of Riblets
Aerotecnica Missili & Spazio, 2016The 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
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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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Effect of the yaw angle on the riblet performance
The Physics of FluidsDirect numerical simulations are performed to investigate the effect of the yaw angle (α) on the drag-reduction performance by riblets in a turbulent channel flow. The yaw angles of α=0° and 90° correspond to the riblets parallel and perpendicular to the
Jonghwan Park, Haecheon Choi
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