质量和阻尼比对串列双方柱中上游柱体振动特性的影响
发布时间：2024-05-11 03:33
当空气或水等流体流经钝体型结构达到一定条件会产生涡激振动现象。对这种流体诱发振动进行探索在许多工程领域中都有很重要的研究价值。一方面用来评估钝体结构如桥梁,近海平台及高层建筑群等等的稳定性;另一方面通过振动装置用于流体能量的收集与转化。目前已有大量文献讲述单柱结构体绕流的探究,相比之下双方柱绕流及其流体诱发振动的研究需要更多关注。本文的模型是基于低雷诺数条件下,双方柱串联排列,下游方柱固定而上游方柱弹性固定。本文通过数值模拟研究在雷诺数Re=100和200情况下的上游方柱振动响应情况以及产生的机理。上游方柱只能横向振动。研究结果与单自由度单方柱振动响应作对比。两个方柱中心距离为间隔比L*取2,6。通过改变固有频率fn来控制无量纲速度Ur(Ur=1-30)的变化。本文通过固定雷诺数Re和间距比L*从如下方面分析上游方柱一维振动响应,振动幅值A*,振动频率fy,升力系数CL、升力和位移之间的相位差φ,斯特劳哈尔数St,方柱振动流场涡旋结构分布以及压力分布。在Re=100且L*=2的条件下,为了更好的研究上游方柱振动响应随Ur的变化情况,Ur=40的情况也会被模拟。另外,本文在Re=100,...
【文章页数】：71 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Acknowledgements
Nomenclature
Chapter 1 Introduction
1.1 Background
1.2 Research status of the subject and analysis
1.2.1 Research on the single square cylinder
1.2.2 The vibration of the cylinder in tandem arrangement
1.3 Objectives and main contents
1.4 Thesis outline
Chapter 2 Numerical method
2.1 Governing equations
2.2 Flow configuration and mesh distribution
2.3 Boundary condition
2.4 Study parameters
2.5 Mesh method
2.6 Numerical verification
2.6.1 Mesh independence
2.6.2 Meshing validation and results
2.7 Summary
Chapter 3 Spacing ratio and Reynolds number
3.1 The wake cylinder in reattachment regime (Re=100)
3.1.1 The responses of amplitude and frequency ratio (m~*=3,ζ=0)
3.1.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=2)
3.2 The wake cylinder in reattachment regime (Re=200)
3.2.1 Transverse response and frequency ratio (m~*=3,ζ=0,L~*=2)
3.2.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=2)
3.3 The wake cylinder in co-shedding regime (Re=100 and 200)
3.3.1 Transverse response and frequency ratio (m~*=3,ζ=0,L~*=6)
3.3.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=6)
3.4 Summary
Chapter 4 Mass and damping ratio
4.1 The effect of mass ratio
4.1.1 Vibration amplitude response
4.1.2 Vibration frequency response
4.2 The effect of damping ratio
4.2.1 Vibration amplitude and frequency responses
4.3 The effect of mass-damping ratio
4.3.1 Vibration amplitude and frequency responses
4.4 Summary
Conclusions
References
中文摘要
本文编号：3969460
【文章页数】：71 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Acknowledgements
Nomenclature
Chapter 1 Introduction
1.1 Background
1.2 Research status of the subject and analysis
1.2.1 Research on the single square cylinder
1.2.2 The vibration of the cylinder in tandem arrangement
1.3 Objectives and main contents
1.4 Thesis outline
Chapter 2 Numerical method
2.1 Governing equations
2.2 Flow configuration and mesh distribution
2.3 Boundary condition
2.4 Study parameters
2.5 Mesh method
2.6 Numerical verification
2.6.1 Mesh independence
2.6.2 Meshing validation and results
2.7 Summary
Chapter 3 Spacing ratio and Reynolds number
3.1 The wake cylinder in reattachment regime (Re=100)
3.1.1 The responses of amplitude and frequency ratio (m~*=3,ζ=0)
3.1.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=2)
3.2 The wake cylinder in reattachment regime (Re=200)
3.2.1 Transverse response and frequency ratio (m~*=3,ζ=0,L~*=2)
3.2.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=2)
3.3 The wake cylinder in co-shedding regime (Re=100 and 200)
3.3.1 Transverse response and frequency ratio (m~*=3,ζ=0,L~*=6)
3.3.2 Time history (lift and displacement) and wake structure (m~*=3,ζ=0,L~*=6)
3.4 Summary
Chapter 4 Mass and damping ratio
4.1 The effect of mass ratio
4.1.1 Vibration amplitude response
4.1.2 Vibration frequency response
4.2 The effect of damping ratio
4.2.1 Vibration amplitude and frequency responses
4.3 The effect of mass-damping ratio
4.3.1 Vibration amplitude and frequency responses
4.4 Summary
Conclusions
References
中文摘要
本文编号：3969460
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