AN EXPERIMENTAL INVESTIGATION OF FLOW OVER OCTAGONAL CYLINDERS WITH ROUNDED CORNERS

Authors

  • Md. Jomir Hossain Department of Mechanical Engineering Bangladesh University of Engineering &Technology (BUET), Dhaka
  • Md. Quamrul Islam Department of Mechanical Engineering Bangladesh University of Engineering &Technology (BUET), Dhaka
  • Mohammad Ali Department of Mechanical Engineering Bangladesh University of Engineering &Technology (BUET), Dhaka

DOI:

https://doi.org/10.3329/jme.v43i1.15767

Keywords:

Wind load, Octagonal cylinder, Pressure distribution, Tall building

Abstract

The static pressure distributions on a single of cylinder with octagonal cross-section having rounded corners are presented. The test was conducted in an open circuit wind tunnel at a Reynolds number of 4.13 x 104 based on the face width of the cylinder across the flow direction in a uniform flow velocity of 13.2 m/s. The experimental test was carried out on a single cylinder at various angles of attack from 0° to 40° at a step of 5°. It was observed that with the rounded corners the drag on the cylinders reduces remarkably in comparison to that on the sharp-edged cylinders. It was also observed that at various angles of attack, the values of the lift coefficients were insignificant compared to those for a sharp-edged square cylinder. The results are applicable to combination of tall buildings one behind the other along the wind velocity direction and each building of square or octagonal cross-section having rounded corners. The wind load on the downstream cylinder decreases remarkably due to the presence of the cylinder in the upstream side.

DOI: http://dx.doi.org/10.3329/jme.v43i1.15767

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Published

2013-07-22

How to Cite

Hossain, M. J., Islam, M. Q., & Ali, M. (2013). AN EXPERIMENTAL INVESTIGATION OF FLOW OVER OCTAGONAL CYLINDERS WITH ROUNDED CORNERS. Journal of Mechanical Engineering, 43(1), 7–14. https://doi.org/10.3329/jme.v43i1.15767

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