摘要
采用嵌入格子-玻尔兹曼方法和自由液面模型的XFlow软件对低雷诺数Re=100下近自由液面圆柱垂向流致振动问题开展数值模拟与机理研究。根据圆柱涡脱落特性和圆柱周围液面形态将浸没比h∈[0,5]和弗劳德数Fr∈[0.3,2]的参数空间划分为6种不同的流态,研究不同流态下圆柱振动特性和振动-涡脱落-自由液面耦合作用。结果表明,圆柱振幅和振动频率都随自由液面的靠近而降低,而当自由液面非常靠近圆柱时,尾迹状态从绝对不稳定性转为对流不稳定性,圆柱与自由液面之间形成的射流状流动附着在圆柱表面上,抑制了涡脱落过程,导致圆柱不再振动。
Vertical flow-induced vibrations(FIV)of a circular cylinder close to a free surface at low Reynolds number Re=100 were investigated numerically using the lattice Boltzmann method and the free surface model embedded in XFlow software.According to the vortex shedding characteristics of the cylinder and the shape of the free surface around the cylinder,the parameter space of submergence depth 0≤h≤5 and Froude number 0.3≤Fr≤2 was divided into six different flow regimes.The vibration characteristics of circular cylinder and vibration-vortex-surface coupling were studied under different flow regimes.The results showed that the cylinder amplitude and vibration frequency decreased as the free surface approaching.When the free surface was very close to the cylinder,the wake state changed from absolute instability to convective instability.The jet-like flow formed between it and the free surface was attached to the surface of the cylinder,which suppressed the vortex shedding process and caused the cylinder stable.
作者
戚翔
冯翔健
熊骋望
孙子正
张一鸣
QI Xiang;FENG Xiangjian;XIONG Chengwang;SUN Zizheng;ZHANG Yiming(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China;School of Qilu Transportation Engineering,Shandong University,Jinan 250061,Shandong,China)
出处
《山东大学学报（工学版）》
CAS
CSCD
北大核心
2022年第3期51-60,共10页
Journal of Shandong University（Engineering Science）
基金
国家自然科学基金青年资助项目(51909055)
海岸与近海工程国家重点实验室专项开放基金项目(LP1921)。
关键词
流致振动
自由液面
低雷诺数
弗劳德数
浸没比
流固耦合
FIV
free surface
low Reynolds number
Froude number
submergence depth ratio
fluid-structure interaction
