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Wind and Structures
  Volume 2, Number 3, September 1999, pages 173-187

Aerodynamic stability for square cylinder with variou corner cuts
Chang-Koon Choi and Dae-Kun Kwon

    The flow around a structure has been an important subject in wind engineering research. There are various kinds of unstable aerodynamic phenomena with regard to a bluff body. In order to understand the physical mechanism of aerodynamic and aeroelastic instability of a bluff body, the relations between the flow around structures and the motion of body with various section shapes should be investigated. Based on a series of wind tunnel tests, this paper addresses the aerodynamic stability of square cylinder with various comer cuts and attack angles in the uniform flow. The test results show that the models with comer cut produced generally better behavior for the galloping phenomenon than the original section. However, the comer cut method can not prevent the occurrence of the vortex-induced vibration(VIV). It is also shown that as the attack angle changes, the optimum size of comer cut changes also. This means that any one specific size of comer cut which shows the best aerodynamic behaviors throughout all the cases of attack angles does not exist. This paper presents an intensive study on obtaining the optimum size of corner cut for the stabilization of aerodynamic behavior of cylinders.
Key Words
    square cylinder; comer cut; aerodynamic stability; wind tunnel experiment
Chang-Koon Choi and Dae-Kun Kwon:Department of Civil Engineering, Korea Advanced Institute of Science and Technology(KAIST), 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea

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