Cross-flow vortex-induced vibration of a flexible riser transporting an internal flow from subcritical to supercritical
Cross-flow vortex-induced vibration of a flexible riser transporting an internal flow from subcritical to supercritical
复制标题
将内部流从亚临界输送到超临界的柔性立管的横流涡流引起的振动
DOI：
10.1016/j.oceaneng.2017.04.039
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发表时间：
2017-07
影响因子：
5
通讯作者：
Zhang Weijing
中科院分区：
文献类型：
--
作者：
Meng Shuai;Zhang Xiaoqing;Che Chidong;Zhang Weijing
本研究旨在模拟及探讨内流效应对轴向输送单相内流之挠性立管涡激振动之影响。仿真模型采用描述输流管道轴向振动和横向振动耦合的非线性方程作为结构模型，采用分布的货车der Pol振子来产生涡激振动效应。控制方程可以通过基于Galerkin的多模方法结合Houbolt有限差分格式求解。所开发的程序已被验证的涡激效应和IFE从亚临界到超临界区域。首先绘制了柔性立管的Argand图，得到了其固有频率随内流速度的变化规律和临界内流速度。在此基础上，对柔性立管在两种均匀流中的流动进行了数值模拟，并在亚临界到超临界的过渡范围内随内流速度的增加进行了数值模拟。CFVIV的IFE检查立管响应和主振动频率的时空修改，可以识别模式切换和共享。结果表明，内流对振动幅值和主振动频率有影响。内部流动可以触发新的自然模式，并转换最主要的一个角色。此外，屈曲颤振耦合的不稳定性被捕获的立管经历静态发散和通过第一自然模式的Hopf分叉。
This study aims to model and explore the IFE (Internal Flow Effect) on the CF (Cross-Flow) VIV (Vortex-Induced Vibration) of a flexible riser transporting an axial single-phase internal flow. The simulation model employs the nonlinear equations describing the coupling of axial and transverse vibrations of a fluid-conveying pipe as the structural model, and adopts a distribution of van der Pol oscillators to create the VIV effect. The governing equations can be solved via a Galerkin-based multi-mode approach combined with the Houbolt's finite difference scheme. The developed code has been validated for VIV effect and IFE from subcritical to supercritical region. The Argand diagram of a flexible riser is plotted at first, and the varying natural frequencies with the increase of internal flow velocity and the critical internal flow velocity can be obtained. Then simulations of the flexible riser at two uniform currents with the increase of internal flow velocity in a transition range from being subcritical to supercritical are conducted. The IFE on CF VIVs are examined by the space-time modifications of riser responses and dominant vibration frequency for which the mode switching and sharing can be identified. It has demonstrated that internal flow influences the vibration amplitude and the dominant vibration frequency. Internal flow can trigger new natural modes and switch the role of the most predominant one. Moreover, a buckling-flutter coupled instability is captured where the riser is experiencing a static divergence and a Hopf bifurcation via the first natural mode.
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影响因子：
4.7
作者：
M. Keber;M. Wiercigroch
通讯作者：
M. Keber;M. Wiercigroch
DOI：
10.1115/1.3424371
发表时间：
1978-09
期刊：
Journal of Applied Mechanics
影响因子：
--
作者：
P. J. Holmes
通讯作者：
P. J. Holmes
DOI：
--
发表时间：
2016
期刊：
--
影响因子：
--
作者：
M. Paidoussis
通讯作者：
M. Paidoussis
影响因子：
3.6
作者：
E. D. Langre
通讯作者：
E. D. Langre
DOI：
10.1006/jfls.1997.0090
发表时间：
1996-07
期刊：
--
影响因子：
--
作者：
T. Sarpkaya;A. Khalak;C. Williamson
通讯作者：
T. Sarpkaya;A. Khalak;C. Williamson