Effect of incoming flow angle on the flow-induced vibration of a square cylinder
Due to the presence of geometric edges and corners,the square structure exhibits a complex vibration re-sponse when subjected to incoming flow,making it an ideal structure for collecting flow-induced vibration energy.This pa-per presents a numerical simulation study on the flow-induced vibration of a square cylinder,analyzing the various types of cylinder vibrations under different incoming flow angles and revealing the effects of section geometry and inflow angle on vibration response,fluid force,phase change,and wake structure.The results demonstrate that the inflow angle plays a cru-cial role in determining both the vibration response and mode of the square cylinder.When the Angle of incoming flow is 0°,the square cylinder will produce galloping response,and the wake structure will be inclined to shift and the vortex shedding is abundant in the period,resulting in low frequency and high amplitude vibration of the square cylinder.When the incoming flow Angle is 15°≤θ ≤30°,vortex-induced vibration and galloping coupling vibration response of the square cylinder oc-curs.When the incoming flow Angle is 45°,vortex-induced vibrations are observed in the square cylinder.By controlling the incoming flow angle to induce galloping responses in the square cylinder from an energy capture perspective,wide-range ocean energy absorption can be achieved.
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