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Effect of the number of grooves on flow characteristics around a circular cylinder with triangular grooves

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Abstract

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 RNGk − ɛ 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.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kanagawa Institute of Technology, 1030, Shimoogino, Atugi-shi, 243-0292, Kanagawa, Japan

    Yamagishi Y.

  2. School of High-Technology for Human Welfare, Tokai University, 317 Nishino, Numazu-shi, 410-0395, Shizuoka, Japan

    Oki M.

Authors
  1. Yamagishi Y.
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  2. Oki M.
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Correspondence to Yamagishi Y..

Additional information

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 an Assistant Professor of Tokai University, and currently is an 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 the number of grooves on flow characteristics around a circular cylinder with triangular grooves. J Vis 8, 57–64 (2005). https://doi.org/10.1007/BF03181603

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  • DOI: https://doi.org/10.1007/BF03181603

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