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Wind and Structures Volume 3, Number 3, September 2000 , pages 209-220 DOI: https://doi.org/10.12989/was.2000.3.3.209 |
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Determination of the Strouhal number based on the aerodynamic behavior of rectangular cylinders |
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Chang Koon Choi and Dae Kun Kwon(Korea)
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| Abstract | ||
| The Strouhal number is an important nondimensional number which is explanatory ofrnaerodynamic instability phenomena. It takes on the different characteristic constant value depending uponrnthe cross-sectional shape of the body being enveloped by the flow. A number of investigations into thisrnsubject, especially on the drag test, surface pressure test and hot-wire test, have been carried out under thernfixed state of the body in the past. However, almost no investigations concerning the determination of thernSt on wind-induced vibration of the body have been reported in the past even though the aerodynamicrnbehavior of the body is very important because the construction of wind-sensitive structures is recently onrnthe sharp increase. Based on a series of wind tunnel tests, this paper addresses a new method to determine thernStrouhal number of rectangular cylinder in the uniform flow. The central idea of the proposed method isrnthat the Strouhal number can be obtained directly by the aerodynamic behaviors of the body throughrnwind-induced vibration test. The validity of proposed method is evaluated by comparing with the resultsrnobtained by previous studies in three B/Ds at attack angle 0 o and a square cylinder with various attackrnangles. The values and trends of the proposed Strouhal numbers are in good agreements with values ofrnprevious studies. And also, the Strouhal numbers of B/D = 1.5 and 2.0 with various attack angles arernobtained by the proposed method and verified by other method. This proposed method is as good as anyrnother previous methods to obtain the Strouhal number. | ||
| Key Words | ||
| determination of the Strouhal number. | ||
| Address | ||
| Chang Koon Choi, Department of Civil Engineering, Korea Advanced Institute of Science and Technology(KAIST), 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, KorearnDae Kun Kwon, Department of Civil Engineering, KAIST, Korea | ||