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不同剪切率来流作用下柔性圆柱涡激振动数值模拟

及春宁 花阳 许栋 邢国源 陈威霖

及春宁, 花阳, 许栋, 邢国源, 陈威霖. 不同剪切率来流作用下柔性圆柱涡激振动数值模拟[J]. 力学学报, 2018, 50(1): 21-31. doi: 10.6052/0459-1879-17-222
引用本文: 及春宁, 花阳, 许栋, 邢国源, 陈威霖. 不同剪切率来流作用下柔性圆柱涡激振动数值模拟[J]. 力学学报, 2018, 50(1): 21-31. doi: 10.6052/0459-1879-17-222
Chunning Ji, Yang Hua, Dong Xu, Guoyuan Xing, Weilin Chen. Numerical simulation of vortex-induced vibration of a flexible cylinder exposed to shear flow at different shear rates[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(1): 21-31. doi: 10.6052/0459-1879-17-222
Citation: Chunning Ji, Yang Hua, Dong Xu, Guoyuan Xing, Weilin Chen. Numerical simulation of vortex-induced vibration of a flexible cylinder exposed to shear flow at different shear rates[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(1): 21-31. doi: 10.6052/0459-1879-17-222

不同剪切率来流作用下柔性圆柱涡激振动数值模拟

doi: 10.6052/0459-1879-17-222
基金项目: 国家自然科学基金项目(51579175);天津市应用基础与前沿技术研究计划项目(12JCQNJC02600);NSFC-广东联合基金(第二期)超级计算科学应用研究专项资助(U1501501);国家超级计算广州中心支持.
详细信息
    作者简介:

    通讯作者: 许栋(1980―),男,山东人,副教授,博士,主要从事流固耦合、涡激振动、泥沙运动研究(E-mail: xudong@tju.edu.cn).

    作者简介:及春宁(1978―),男,河北人,教授,博士,主要从事流固耦合、涡激振动、泥沙运动研究(E-mail: cnji@tju.edu.cn)

    通讯作者:

    许栋

  • 中图分类号: P751,TB531;

Numerical simulation of vortex-induced vibration of a flexible cylinder exposed to shear flow at different shear rates

  • 摘要: 采用浸入边界法对细长柔性圆柱在线性剪切流条件下的涡激振动进行三维数值模拟。细长柔性圆柱振动采用三维索模型模拟,其两端铰接,质量比为6,长细比为50,无量纲顶张力为496。来流为线性剪切流,剪切率从0到0.024变化,最大雷诺数为250。研究发现:剪切流作用下柔性立管横流向振动表现为驻波模式,而顺流向振动表现为行波-驻波混合模式。随着剪切率增大,振动频谱呈现多频响应,振动能量逐渐向低频转移。阻力系数平均值随着展向变化,脉动阻力系数和升力系数的均方根值均表现为“双峰”模式。流固能量传递系数沿立管轴向的分布表明,振动激励区集中于高流速区,而振动阻尼区多位于低流速区。剪切率较小时,圆柱的泻涡为平行交叉模式;剪切率较大时,圆柱的泻涡为倾斜泻涡模式,且由于泻涡频率沿立管轴向变化,尾流发生涡裂现象,形成泻涡频率不同的胞格结构。

     

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出版历程
  • 收稿日期:  2017-06-15
  • 刊出日期:  2018-01-18

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