Abstract
It is known that for a square cylinder subjected to uniform flow, the drag force changes with the angle of attack. To clarify the flow characteristics around a square cylinder with corner cutoffs, we measured the drag coefficient and the Strouhal number for changing chamfer dimensions. We analyzed the flow around a square cylinder with corner cutoffs by applying the RNG k–ε turbulent model, and investigated the surface flow pattern using visualization by means of the oil film and mist flow method. From these results, we obtained the surface flow patterns by the oil film method and numerical analysis. The numerical results agreed well with the experimental values. The drag coefficient of the square cylinder with corner cutoffs decreased suddenly at an angle of attack of about α = 0°– 10° when compared with the drag coefficient for a square cylinder. The minimum value of the drag coefficient for the square cylinder with corner cutoffs decreased by about 30% compared with that for the square cylinder. The drag coefficient of the square cylinder with 10% corner cutoffs was found to be smallest, since the wake area of this square cylinder was smaller compared with that of the other square cylinder.
Graphical Abstract
Similar content being viewed by others
References
Igarashi T (1984) Characteristics of the flow around square prisms. Trans Jpn Soc Mech Eng 50(449):210–218
Koide M, Okanaga H, Aoki K (2006) Drag reduction effect of square cylinders by grooves and corner-cuttings. J Visualization Soc Jpn 26(1):69–72
Kurata M, Morishita T (1998) Drag reduction of a bluff body with small cutout at its edges. Trans Jpn Soc Mech Eng 64(618):397–404
Layukallo T, Nakamura Y (2003) Passive separation control on a square cylinder at transonic speed. Trans Jpn Soc Aeronaut Space Sci 45(150):236–242
Lee BE (1975) The effect of turbulence on the surface pressure field of a square prism. J Fluid Mech 69(2):263–282
Ohtsuki S, Fujii K, Washizu K, Ohya T (1978) Wind tunnel experiments on aerodynamic forces and pressure distributions of rectangular cylinders in a uniform flow. Symp Jpn Assoc Wind Eng 5:169–176
Shao CP, Wang JM, Wei QD (2007) Visualization study on suppression of vortex shedding from a cylinder. J Visualization 10(1):57–64
Yamagishi Y, Akaike S, Nemoto M (2004) Effect of the grooves on flow characteristics around a square prism. 52th Symposium of turbomachinery Society of Japan, Niigata, pp 118–123
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yamagishi, Y., Kimura, S. & Oki, M. Flow characteristics around a square cylinder with changing chamfer dimensions. J Vis 13, 61–68 (2010). https://doi.org/10.1007/s12650-009-0005-6
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12650-009-0005-6