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With the swift advancement of offshore oil exploration, the intersection of pipelines has become a prevalent occurrence in nearshore areas. The flow dynamics and sediment transport processes around two crossing pipelines exhibit greater complexity compared to those associated with a conventional isolated pipeline. This study investigates the 3D scour development process below two crossing pipelines under steady currents based on numerical simulations. The lower pipeline is positioned normal to the current direction while the upper pipeline is installed above it at an crossing angle. The numerical results suggest that the 3D scour propagation rate on both the left and right sides diminishes with an increase in the crossing angle, and both rates exceed those observed for an single pipeline. Due to the asymmetry of the structure, the propagation rate on the right half is lower than that on the left. When the crossing angle reaches 90°, the results closely resemble those observed in the case of a single pipeline. The current numerical findings offer significant insights for the design of pipelines in practical engineering applications.

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Numerical Study on Local Scour Propagation Below Two Intersecting Pipelines on a Sandy Seabed Under Currents

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Zhuo Fang,
  • Zhaolong Yin,
  • Limeng Zhao,
  • Zhipeng Zang

摘要

With the swift advancement of offshore oil exploration, the intersection of pipelines has become a prevalent occurrence in nearshore areas. The flow dynamics and sediment transport processes around two crossing pipelines exhibit greater complexity compared to those associated with a conventional isolated pipeline. This study investigates the 3D scour development process below two crossing pipelines under steady currents based on numerical simulations. The lower pipeline is positioned normal to the current direction while the upper pipeline is installed above it at an crossing angle. The numerical results suggest that the 3D scour propagation rate on both the left and right sides diminishes with an increase in the crossing angle, and both rates exceed those observed for an single pipeline. Due to the asymmetry of the structure, the propagation rate on the right half is lower than that on the left. When the crossing angle reaches 90°, the results closely resemble those observed in the case of a single pipeline. The current numerical findings offer significant insights for the design of pipelines in practical engineering applications.