Integral transform solution for fluid force investigation of a flexible circular cylinder subject to vortex-induced vibrations

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• 作者：Jijun Gu ; Menglan Duan
• 关键词：Fluid force ; Integral transform ; Vortex ; induced vibrations ; Model test ; Towing tank ; Flexible cylinder
• 刊名：Journal of Marine Science and Technology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：21
• 期：4
• 页码：663-678
• 全文大小：2,298 KB
• 刊物类别：Engineering
• 刊物主题：Automotive and Aerospace Engineering and Traffic
  Engineering Fluid Dynamics
  Engineering Design
  Offshore Engineering
  Mechanical Engineering
  
• 出版者：Springer Japan
• ISSN：1437-8213
• 卷排序：21

文摘

In the present paper, fluid force distribution of a long flexible cylinder subject to vortex-induced vibrations is investigated by Generalized Integral Transform Technique (GITT). This method is using experimental response data as input, and then implementing GITT to transfer the governing differential equations to ordinary differential equations. Therefore, the selection of truncation order could be analyzed to avoid the error induced by the high-mode response. Once each mode contribution of fluid force is obtained, the analytical inversion transfer recovers the fluid force. An experiment was carried out in a towing tank and the experimental response was accurately measured and used as input, then GITT was performed to calculate the fluid force distribution of the long flexible cylinder. The comparison between the numerical results from GITT and the experimental results from load cell verified the capability and availability of the proposed method. If one can use this method for lower modes, then one certainly can extend the method for higher modes. Two experimental cases from the literature were evaluated and good agreement was obtained based on the spatio-temporal evolutions of the lift coefficient and the mode numbers. Since this method is easy to implement, it could be an alternative method to investigate fluid force of such slender structures.