ABSTRACT

The flow induced vibration (FIV) responses of two rigidly connected cylinders at different staggered configurations have been studied numerically. The two cylinders, with an equal diameter of D, can oscillate in both cross-flow (CF) and in-line (IL) directions simultaneously. The center-to-center spacing between the two cylinders has been fixed at 4D. The numerical results demonstrate that as the angle of incidence (α) increases, the wake interference between the two cylinders becomes weak. For α with small values, the FIV responses are dominated by the galloping vibration and the vortex-induced vibration (VIV) simultaneously. However, for α with large values, the FIV responses are obviously dominated by the VIV. As α increases, the maximum vibration amplitude follows a downward trend and the total mean drag coefficient tends to decrease. Furthermore, the vortex shedding flow pattern has apparently different modes for varying α.

摘要

数值研究了两个刚性连接圆柱体在不同交错配置下的流致振动（FIV）响应。两个具有相同直径D的圆柱体可以同时在交叉流 (CF) 和直​​列 (IL) 方向上振荡。两个圆柱体之间的中心距固定为 4 D。数值结果表明，随着入射角 ( α ) 的增加，两个圆柱体之间的尾流干扰变弱。对于较小的α值，FIV 响应同时由舞动振动和涡激振动 (VIV) 主导。然而，对于α值较大时，FIV 响应明显以 VIV 为主。随着α的增加，最大振动幅度呈下降趋势，总平均阻力系数趋于减小。此外，涡旋脱落流动模式对于不同的α具有明显不同的模式。