Control of Boundary Layer on a Flat Plate by Means of Cavity Flow
Journal of Visualization
Flying Characteristics and Flow Pattern of a Sphere with Dimples
Journal of Visualization
Effect of Groove Shape on Flow Characteristics around a Circular Cylinder with Grooves
Journal of Visualization
Visualization Study on Suppression of Vortex Shedding from a Cylinder
Journal of Visualization
Numerical Simulation of Flow around a Circular Cylinder with Curved Sectional Grooves
Journal of Visualization
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In the flow around a circular cylinder, a sudden decrease in the mean drag coefficient occurs at a high Reynolds number, but the same phenomenon occurs at a lower Reynolds number in the case where there exist grooves or roughness on the cylinder surface. In this paper, in order to make clear the flow characteristics around a cylinder with 20, 26 and 32 triangular grooves, the mean drag coefficient, pressure distribution, velocity distribution and turbulence intensity distribution were measured. Moreover, the flow around the cylinder was analyzed by applying the RNG k - ε turbulent model, and the surface flow pattern was investigated using the oil-film technique. From these results, it was found that a sudden decrease in the mean drag coefficient of a cylinder with 32 triangular grooves occurs at a lower Reynolds number compared with 20 and 26 triangular grooves.