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Numerical Simulation of the Vortex-Induced Vibration of A Curved Flexible Riser in Shear Flow

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Abstract

A series of fully three-dimensional (3D) numerical simulations of flow past a free-to-oscillate curved flexible riser in shear flow were conducted at Reynolds number of 185–1015. The numerical results obtained by the two-way fluid–structure interaction (FSI) simulations are in good agreement with the experimental results reported in the earlier study. It is further found that the frequency transition is out of phase not only in the inline (IL) and crossflow (CF) directions but also along the span direction. The mode competition leads to the non-zero nodes of the rootmean- square (RMS) amplitude and the relatively chaotic trajectories. The fluid–structure interaction is to some extent reflected by the transverse velocity of the ambient fluid, which reaches the maximum value when the riser reaches the equilibrium position. Moreover, the local maximum transverse velocities occur at the peak CF amplitudes, and the values are relatively large when the vibration is in the resonance regions. The 3D vortex columns are shed nearly parallel to the axis of the curved flexible riser. As the local Reynolds number increases from 0 at the bottom of the riser to the maximum value at the top, the wake undergoes a transition from a two-dimensional structure to a 3D one. More irregular small-scale vortices appeared at the wake region of the riser, undergoing large amplitude responses.

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Authors and Affiliations

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China

    Hong-jun Zhu

  2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China

    Hong-jun Zhu & Peng-zhi Lin

Authors
  1. Hong-jun Zhu
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  2. Peng-zhi Lin
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Correspondence to Peng-zhi Lin.

Additional information

Foundation item: The research work was financially supported by the National Natural Science Foundation of China (Grant Nos. 11502220 and 51479126), the Youth Science and Technology Foundation of Sichuan Province (Grant No. 2017JQ0055), and the Youth Scientific and Technological Innovation Team of the Safety of Deep-Water Pipe Strings of Southwest Petroleum University (Grant No. 2017CXTD06).

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Zhu, Hj., Lin, Pz. Numerical Simulation of the Vortex-Induced Vibration of A Curved Flexible Riser in Shear Flow. China Ocean Eng 32, 301–311 (2018). https://doi.org/10.1007/s13344-018-0031-z

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  • DOI: https://doi.org/10.1007/s13344-018-0031-z

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