The honeycomb-shaped structure has been proved to have good mechanical properties, and is it possible combining its good mechanical properties together with its flow characteristics? This will determine whether the honeycomb-shaped cylinder can be further extended to the practical application in ocean engineering or wind engineering. Therefore, the flow-induced vibration (FIV) responses of the three-dimensional cylinders inspired by the honeycomb are numerically investigated. Three different structures are considered, including the smooth cylinder (P0), the P60 cylinder corresponds to the direct impingement of the freestream on the saddle point, and the P30 cylinder corresponds to the vertical impingement of the freestream on the one edge of the structural element. The Reynolds number ranges of the simulations are 0.8 x 104 = 40, beta >= 0, the large-amplitude motion will not occur in the high reduced velocity range. When theta < 40, beta < 0, and the negative damping phenomenon is observed and the galloping occurs.
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