Numerical simulation of the small pipeline placement on hydrodynamics and local scouring of the piggyback pipeline
Yang, S. Yang, L. Zhao, E. Yu, G. Zhang, M.
Yang, S.
Yang, L.
Zhao, E.
Yu, G.
Zhang, M.
Publication Date
2025-04-15
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2025-02-06
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Abstract
Piggyback pipelines are wildly used in the offshore oil industry. However, the impact of small pipeline location on local scouring remains unclear. In this study, the hydrodynamics and local scour around a piggyback pipeline under unidirectional flow were investigated using a validated numerical model. The results indicate that significant shifts in the position of stagnation point along the large pipeline as α (the small pipeline position angle) varies between 0°-75° and 315°–360°. Specifically, the position of the highest stagnation point occurs at α = 60°, while the lowest occurs at α = 318°. When the small pipeline is installed below the large one, the scour hole around the piggyback pipeline is smaller than that on the single pipeline, while the minimum local scour at the piggyback pipeline occurs at α = 222°. The scour hole is larger when the small pipeline is directly above the large pipeline compared to being installed below. Similarly, the scour hole is larger when the small pipeline is positioned at lower intake surface of the large pipeline (α = 270°–360°) instead of lower back surface (α = 180°–270°). These findings offer valuable insights for optimizing the structural configuration to minimize the local scour at piggyback pipeline.
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Yang S, Yang L, Guo Y et al (2025) Numerical simulation of the small pipeline placement on hydrodynamics and local scouring of the piggyback pipeline. Ocean Engineering. 323: 120642.
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