Abstract
In the flow around a circular cylinder, a sudden decrease in the drag force 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 circular cylinder surface. In this paper, in order to make clear the flow characteristics around a circular cylinder in the case of changing the shapes of grooves, the drag coefficient, pressure distribution, velocity distribution and turbulent distribution were measured. Moreover the flow around the cylinder was analyzed by applying the RNGk · ∈ turbulent model, and the surface flow pattern was investigated using the oil-film technique. From these results, it is clear that the drag coefficient of a circular cylinder with triangular grooves decreases by about 15% compared with that of a circular cylinder with arc grooves.
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Yoichi Yamagishi: He received his M.Sc. (Eng.) degree in Mechanical Engineering in 1978 from Tokai University. After obtaining M.Sc. he worked as an engineer at Hibiya Engineering, Ltd. He then became a research assistant of Kanagawa Institute of Technology. His current research interests are experimental and computational fluid dynamics.
Makoto Oki: He received his M.Sc. (Eng.) degree in Mechanical Engineering in 1976 from Tokai University and his Ph.D. in Mechanical Engineering in 2000 from the same university. After obtaining M.Sc. he worked as a system engineer at Japan Advanced Numerical Analysis, Inc.. He then became a assistant professor of Tokai University, and currently is a associate professor. His current research interests are computational fluid dynamics, computer graphics and internet application.
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Yamagishi, Y., Oki, M. Effect of groove shape on flow characteristics around a circular cylinder with grooves. J Vis 7, 209–216 (2004). https://doi.org/10.1007/BF03181635
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DOI: https://doi.org/10.1007/BF03181635