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

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Abstract

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.

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Acknowledgments

The authors gratefully acknowledge the experimental data contributed by Norwegian Deepwater Programme (NDP) Riser and Mooring project, and they also would like to thank the financial support provided by the Natural Science Fund of China (Grant No. 51409259), the Science Foundation of China University of Petroleum, Beijing (Grant No. 2462013YJRC004), the National Basic Research Program of China (973 Program, Grant No. 2011CB013702) for the financial support of this research.

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Authors and Affiliations

  1. Offshore Oil/Gas Research Center, China University of Petroleum, Beijing, 102249, China

    Jijun Gu & Menglan Duan

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  1. Jijun Gu
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  2. Menglan Duan
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Correspondence to Jijun Gu.

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Gu, J., Duan, M. Integral transform solution for fluid force investigation of a flexible circular cylinder subject to vortex-induced vibrations. J Mar Sci Technol 21, 663–678 (2016). https://doi.org/10.1007/s00773-016-0381-2

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  • DOI: https://doi.org/10.1007/s00773-016-0381-2

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