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Numerical simulation of flow around a circular cylinder with curved sectional grooves

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Abstract

In a circular cylinder with uniform flow, a sudden decrease in the drag force occurs at a high Reynolds numbers; however, it is known that the same phenomenon occurs at a lower Reynolds number in the case where there exist grooves or roughness on the circular cylinder surface. To clarify the flow characteristics around a circular cylinder in the case of changing the shape of grooves we analyzed the drag coefficient, lift coefficient, turbulent kinetic energy, vorticity and pressure by applying the RNGk-ε turbulent model. The shapes of the grooves were arced, triangulated and curved. The results showed that the separation point for a circular cylinder with curved sectional grooves shifts to the most downstream side and the drag coefficient becomes the smallest among circular cylinders with 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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Additional information

Yoichi Yamagishi: He received his M.Sc. (Eng.) degree in Mechanical Engineering in 1978 from Tokai University and his Ph.D. in Mechanical Engineering in 2006 from the same university. After obtaining M.Sc. he worked as an engineer at Hibiya Engineering, Ltd. He then became an assistant professor of Kanagawa Institute of Technology.

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 a professor. His current research interests are computational fluid dynamics, computer graphics and internet application.

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Yamagishi, Y., Oki, M. Numerical simulation of flow around a circular cylinder with curved sectional grooves. J Vis 10, 179–186 (2007). https://doi.org/10.1007/BF03181829

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  • DOI: https://doi.org/10.1007/BF03181829

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