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Wind and Structures
  Volume 1, Number 4, December 1998 , pages 351-364

Wind tunnel blockage effects on aerodynamic behavior of bluff body
Chang-Koon Choi and Dae-Kun Kwon

     In wind tunnel experiments , the blockage effect is a very important factor which affects the test results significantly. A. number of investigations into this problem, especially on the blockage correction of drag coefficient, have been carried out in the past. However, only a limited number of works have been reported on the wind tunnel blockage effect on wind-induced vibration although it is considered to be fairly important. This paper discusses the aerodynamic characteristics of the square model and square model with corner cut based on a series of the wind tunnel tests with various blockage ratios and angles of attack. From the test results, the aerodynamic behavior of square models with up to 10% blockage ratio are almost the same and square models with up to 10% blockage ratio can be tested as a group which behaves similarly.
Key Words
    blockage effect; wind-induced vibration; wind tunnel experiment.
Department of Civil Engineering, KAIST, Yusong, Taejon 305-701, Korea

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