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Visualization of flow past a square prism with cut-corners at the front-edge

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Abstract

Flow past a square prism with cut-corners at the front-edge is numerically and experimentally visualized to investigate a mechanism of drag reduction. An adaptive numerical scheme based on the vortex method is implemented for two values of the Reynolds number between 200 and 1,250, and the results are compared with experiments. Experimental visualization techniques include the hydrogen-bubble technique atRe=4,000 and the oil-flow technique atRe=10,000 for a global wake formation, and the aluminum-flake technique for transient flow at the early stage of motion atRe=1,250. A similar reattachment flow pattern is shown in a wide range of the Reynolds number between 200 and 10,000, which implies a possibility of the drag reduction in the Reynolds number being approximately lower than 8,000 unlike the previous findings.

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Author information

Correspondence to Y. Ueda.

Additional information

Yoshiaki Ueda: He received his Ph.D. in 2003 from Department of Mechanical Engineering at Osaka Prefecture University. He has been a Research Fellow of Japan Society for Promotion of Science (JSPS) in Department of Materials Science and Engineering at Hokkaido University (2004–2006) including a visiting researcher in Laboratoire d’Hydrodynamique at École Polytechnique during 2005. He is currently a PostDoctral researcher in Division of Materials Science and Engineering at Hokkaido University. His research interests include: Low-Reynolds-Number Flow, Matched Asymptotic Expansions, Vortex Particle Method and Brownian Movement.

Mitsuo Kurata: He received his Ph.D. in 1979 from Department of Mechanical Engineering at Osaka Prefecture University. He works in Department of Mechanical Engineering, Setsunan University as a professor since 2001. His research interests are drag reduction and non-contacting and suspending support of air cushion pad.

Teruhiko Kida: He received his Ph.D. in 1972 from Department of Mechanical Engineering at University of Osaka Prefecture (present: Osaka Prefecture University). He is Professor Emeritus of Osaka Prefecture University since 2004. His research interests are numerical simulation of the onset of turbulence by a Vortex Method and a transient low Reynolds number flow.

Manabu Iguchi: He received his M.Sc. (Eng.) in Mechanical Engineering in 1973 from Osaka University. He also received his Ph.D. in Mechanical Engineering in 1981 from Osaka University. He works in Division of Materials Science and Engineering, Graduate School of Engineering of Hokkaido University as a professor since 1996. His research interests are transport phenomena in materials processing operations and development of velocimeters for molten metals at high temperatures.

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Ueda, Y., Kurata, M., Kida, T. et al. Visualization of flow past a square prism with cut-corners at the front-edge. J Vis 12, 383–391 (2009). https://doi.org/10.1007/BF03181881

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Keywords

  • Drag Reduction
  • Square Prism
  • Vortex Method
  • Hydrogen-Bubble Technique
  • Aluminum-Flake Technique
  • Oil-Flow Technique