FORMATION PROCESS OF SPATIAL CORRELATIONS OF FLUCTUATING LIFT FORCES ON A FLAT RECTANGULAR CYLINDER

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  • 扁平矩形断面に作用する変動空気力の空間相関形成機構に関する一考察

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It is well known that the spatial correlation of fluctuating life force, RL′, is important to estimate the vertical gust response in frequency domain. Generally, the spatial correlation of approaching flow fluctuation, RW′, is used for the estimation, instead of RL′, because the measurement of RL′ is very difficult. However, RW′ and RL′ are not necessarily equal. This difference affects the result of gust response analysis. In this study, the relation of the spatial correlation between the approaching flow fluctuation and the fluctuating lift force were investigated by wind tunnel test. Furthermore, the formation process of the spatial correlation of the fluctuating force was investigated by generating the periodic disturbance near the stagnation point. As results of this study, the transmission process from the flow fluctuation to the fluctuating force with spreading the spatial correlation was clarified.

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