具有不同周向位置U型凹槽的圆柱涡激振动特性数值模拟研究  

Numerical Simulation of Vortex-induced Vibration Characteristics of a U-groove Cylinder

作　　者：苏俊龙 韩翔希 齐国胜 任地 蒙占彬 辜坚 SU Junlong;HAN Xiangxi;QI Guosheng;REN Di;MENG Zhanbin;GU Jian(Key Laboratory of Beibu Gulf Offshore Engineering Equipment and Technology,Education Department of Guangxi Zhuang Autonomous Region,Beibu Gulf University,Qinzhou 535000,China;China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]北部湾大学广西海洋工程装备与技术重点实验室,钦州535000 [2]中国船舶科学研究中心,无锡214082

出　　处：《中国造船》2024年第4期89-102,共14页Shipbuilding of China

基　　金：国家自然科学基金项目(52201304);广西研究生教育创新计划项目(YCSW2023518);广西科技重大专项(桂科AA22068105)。

摘　　要：基于CFD和CSD的双向流固耦合方法和重叠网格法对裸圆柱和U型凹槽圆柱涡激振动特性进行数值模拟研究,对比分析不同周向位置凹槽对圆柱振动响应、振动频率、水动力系数以及尾流旋涡脱落模式的影响,探明不同周向位置凹槽对圆柱涡激振动产生抑制或促进作用的约化速度范围。研究结果表明,45°凹槽在低约化速度U^(*)=2.0~8.0内能有效降低圆柱的横流向振动和升力幅值,而在高约化速度U^(*)=9.0~14.0内,将增大圆柱横流向振动和升力幅值;90°凹槽在U^(*)=7.0~11.0内能显著降低圆柱横流向振动幅值,而在U^(*)≥12.0时,圆柱横流向振动幅值逐渐增大并大于裸圆柱,且振动响应主要表现为多频、宽频振动特征;135°凹槽圆柱横流向振动幅值整体上大于裸圆柱,升力系数均方根和阻力系数均值的变化规律与裸圆柱相似;45°、90°和135°凹槽圆柱阻力系数均值与裸圆柱相比分别降低28.39%、35.80%和6.79%。45°和135°凹槽圆柱尾流旋涡脱落模式与裸圆柱相似,均存在SS、2S、2T以及2P模式,在90°凹槽圆柱尾流旋涡脱落中没有发现2T和2P模式,但存在2C模式。In this study,the vortex induced vibration characteristics of bare cylinder and U-groove cylinders are systematically simulated based on the bidirectional fluid-structure interaction method with CFD and CSD,along with the overset grid method.We compare and analyze the effects of different circumferential positions of the grooves on the vibration response,vibration frequency,hydrodynamic coefficients and wake vortex shedding pattern.The reduced velocity range in which vortex-induced vibrations of the cylinder are suppressed or promoted by grooves at different circumferential positions is investigated.The results show that the 45o groove can effectively reduce the transverse vibration amplitude and lift amplitude of the cylinder in the range of low reduced velocity U^(*)=2.0-8.0,whereas in the range of high reduced velocities U^(*)=9.0-14.0,the 450 groove increases both the transverse vibration amplitude and lift amplitude of the cylinder.In the range of reduced velocities U^(*)-7.0-11.0,the 90°groove significantly reduces the transverse amplitude of the cylinder.At reduced velocities U^(*)≥12.0,the transverse amplitude of the 90°grooved cylinder progressively becomes larger than that of the bare cylinder,and the vibrational response exhibits mainly multi-frequency peaks and wide-band vibrational characteristics.When the transverse amplitude of the 135°grooved cylinder exceeds that of the bare cylinder,the root-mean-square variation of the lift coefficient and the mean drag coefficient are similar to those of the bare cylinder.Compared to the bare cylinder,the average drag coefficient of the 45°,90°and 135°gro0ved cylinder decreased by 28.39%,35.80%and 6.79%,respectively.Similarly,in the wake vortex shedding mode,SS,2S,2T and 2P modes were observed for the 45°and 135°grooved cylinders,while only 2C modes were found for the 90°grooved cylinder,without 2T and 2P modes.

关 键 词：重叠网格法 涡激振动 U型凹槽圆柱 流固耦合 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]