摘要
串列布置的多柔性圆柱广泛存在于海洋工程、土木工程、核工业等工程领域。然而,当前关于两个以上串列柔性圆柱的流致振动(FIV)的研究成果有限,尤其是对串联多柔性柱间的流动干扰机制、流体-结构互作机制尚不清楚。因此,基于大涡模拟数值方法精确捕捉流场流动特性,并结合两端固支梁模型,研究了串列布置的五柔性圆柱体的FIV机制,其质量比为2,两个相邻的圆柱中心间距为3D(D表示圆柱直径),雷诺数为9000。数值模拟结果表明:在第1圆柱和第2圆柱之间发生了剪切层的分离,但并未附着到下游圆柱表面上,导致漩涡完全脱落;根据频率特性分析,第1圆柱和第2圆柱的振动是由其本身漩涡脱落引起的,且主导频率也是单一的,而下游圆柱的振动呈现多个主导频率形式,并且涡脱频率不再显著。
Multiple flexible cylinders arranged in tandem are widely used in various fields such as marine,civil engineering and nuclear industry.However,there are limited reports on the flow-induced vibration(Flow-induced vibration,FIV)of more than two flexible cylinders in tandem arrangement so far,especially on the flow disturbance mechanism the fluid-structure interaction mechanism.Therefore,the study accurately recorded the flow characteristics based on the numerical method of large eddy simulation,and based on combination with the beam model with fixed ends,it studied the FIV mechanism with five series flexible cylinders.The mass ratio is 2 and the center-to-center distance between two adjacent cylinders is fixed on 3D(D is the diameter of the cylinders).The Reynolds number is set to 9000.The results illustrate that the separation of the shear layer occurred on the first cylinder but did not attach to the surface of the second cylinder,which results in the vortex shedding completely;the vibrations of the first and second cylinder were caused by their own vortex shedding according to the frequency characteristics analysis and the dominant frequency was single,while the vibration of the downstream cylinder shows multiple dominant frequencies and the vortex shedding frequency is no longer significant.
作者
潘帅
包艳
PAN Shuai;BAO Yan(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《甘肃科学学报》
2023年第2期88-93,共6页
Journal of Gansu Sciences
基金
国家自然科学基金资助项目(51679139,11772193)。
关键词
流致振动
计算流体力学
流固耦合
大涡模拟
串列多圆柱
Flow-induced vibration
Computational fluid dynamics
Flow-structure interaction
Large-eddy simulation
Multiple tandem cylinders
