Numerical Simulation of Flow around a Circular Cylinder with Curved Sectional Grooves

  • Authors:

  • Y. Yamagishi;M. Oki

  • Affiliations:

  • Department of Mechanical Engineering, Kanagawa Institute of Technology, 1030 Shimoogino, Atugi-shi, Kanagawa 243-0292, Japan. E-mail: yamagisi@me.kanagawa-it.ac.jp;School of High-Technology for Human Welfare, Tokai University, 317 Nishino, Numazu-shi, Shizuoka 410-0395, Japan

  • Venue:
  • Journal of Visualization
  • Year:
  • 2007

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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 RNG k - 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.