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<p>An experimental analysis of the slug-induced vibration (SIV) of a flexible catenary riser with an aspect ratio of 130 is reported in this work. The vibration responses and internal slug flow details at different gas-liquid ratios (<i>Q</i><sub>g</sub>/<i>Q</i><sub>l</sub>) and mixture velocities (<i>v</i><sub>m</sub>) are non-intrusively and simultaneously captured by high-speed cameras. Both the in-plane and out-of-plane responses of the catenary riser are excited in all considered cases. The slug flow characteristics, including translational velocities, slug lengths, recurrence frequencies, and pressure variations, are analyzed and discussed, as are the dynamic responses of the riser in terms of the amplitudes, space-varying frequency, and modal weight. The dominant modal response based on the root-mean-square amplitude profiles does not match that based on the dominant frequency. Three mode switching types are identified based on the RMS amplitude profiles and the dominant frequency. When <i>v</i><sub>m</sub> is small, no mode switching (NMS) is observed in either the in-plane or out-of-plane responses. For mode switching I (MS I), the switching between the first and second modes in the in-plane response is induced by slug flow with different recurrence frequencies in cases of large <i>Q</i><sub>g</sub>/<i>Q</i><sub>l</sub>. However, there is no mode switching in the out-of-plane response. The switching between the first and third modes for the in-plane response and the second and fourth modes for the out-of-plane response (MS II) occurs in cases of relatively high <i>v</i><sub>m</sub> and low <i>Q</i><sub>g</sub>/<i>Q</i><sub>l</sub>.</p>

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Experimental Investigation of the Slug-Induced Vibration of a Flexible Catenary Riser at Variable Gas-Liquid Ratios and Mixture Velocities

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Yue Gao,
  • Hong-jun Zhu,
  • Bing Xu,
  • Min-hao Wang,
  • Mai Zhou

摘要

An experimental analysis of the slug-induced vibration (SIV) of a flexible catenary riser with an aspect ratio of 130 is reported in this work. The vibration responses and internal slug flow details at different gas-liquid ratios (Qg/Ql) and mixture velocities (vm) are non-intrusively and simultaneously captured by high-speed cameras. Both the in-plane and out-of-plane responses of the catenary riser are excited in all considered cases. The slug flow characteristics, including translational velocities, slug lengths, recurrence frequencies, and pressure variations, are analyzed and discussed, as are the dynamic responses of the riser in terms of the amplitudes, space-varying frequency, and modal weight. The dominant modal response based on the root-mean-square amplitude profiles does not match that based on the dominant frequency. Three mode switching types are identified based on the RMS amplitude profiles and the dominant frequency. When vm is small, no mode switching (NMS) is observed in either the in-plane or out-of-plane responses. For mode switching I (MS I), the switching between the first and second modes in the in-plane response is induced by slug flow with different recurrence frequencies in cases of large Qg/Ql. However, there is no mode switching in the out-of-plane response. The switching between the first and third modes for the in-plane response and the second and fourth modes for the out-of-plane response (MS II) occurs in cases of relatively high vm and low Qg/Ql.