Abstract
To understand the mechanism of the various shape riblets on drag reduction, computational fluid dynamic software is used to numerical calculate three typical riblets, such as v-shaped riblets, interval-triangular-shaped riblets and blade-shaped riblets. Values of the h/s (height-to-spacing ratio) are selected to explore the differences between the riblets on the flow field. The drag reduction reason is that the riblets have a large low resistance area. The low resistance area is affected by the riblet height. With the height increasing, the wall shear stress of the low resistance area reduces. The high resistance area is related to the near wall turbulent kinetic energy. The turbulent kinetic energy analysis can determine the strength of the various shape riblets’ high resistance. The characteristics of various shape riblets in the flow field are different from each other. The actual drag surface area also affects the drag reduction.
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