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<p>This study examines the slug-induced vibration (SIV) response and fatigue behavior of offshore risers subjected to internal slug flow. A structural model incorporating internal slug flow dynamics is developed using the Absolute Nodal Coordinate Formulation (ANCF) and a spatial-temporal density variation equation to analyze how slug flow parameters affect the SIV response of risers. Structural displacement, stress, and fatigue responses are systematically evaluated to characterize the structural behavior under SIV conditions. Longer slugs induce more pronounced traveling wave characteristics, while shorter slugs facilitate a mixed traveling-standing wave mode. Moreover, higher slug frequencies lead to increased fatigue accumulation, especially over an extended touchdown zone, thereby compromising the structural integrity of the riser. The findings yield valuable insights into the dynamic interactions between slug flow and riser response. This research advances the understanding of SIV mechanisms and provides a theoretical foundation for fatigue assessment and structural optimization, contributing to the safe and efficient design of offshore risers in deepwater environments.</p>

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Investigation on Fatigue Damage of Offshore Risers Due to Slug-Induced Vibrations Based on Arbitrary Lagrangian-Eulerian (ALE)-Absolute Nodal Coordinate Formulation (ANCF)

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • De-peng Liu,
  • Yu Zhang,
  • Shang-mao Ai

摘要

This study examines the slug-induced vibration (SIV) response and fatigue behavior of offshore risers subjected to internal slug flow. A structural model incorporating internal slug flow dynamics is developed using the Absolute Nodal Coordinate Formulation (ANCF) and a spatial-temporal density variation equation to analyze how slug flow parameters affect the SIV response of risers. Structural displacement, stress, and fatigue responses are systematically evaluated to characterize the structural behavior under SIV conditions. Longer slugs induce more pronounced traveling wave characteristics, while shorter slugs facilitate a mixed traveling-standing wave mode. Moreover, higher slug frequencies lead to increased fatigue accumulation, especially over an extended touchdown zone, thereby compromising the structural integrity of the riser. The findings yield valuable insights into the dynamic interactions between slug flow and riser response. This research advances the understanding of SIV mechanisms and provides a theoretical foundation for fatigue assessment and structural optimization, contributing to the safe and efficient design of offshore risers in deepwater environments.