Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed

Zhang, Fan; Zang, Zhipeng; Zhao, Ming; Zhang, Jinfeng; Xie, Botao; Zou, Xing

doi:10.3390/jmse10122019

Open AccessArticle

Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed

by

Fan Zhang

¹

,

Zhipeng Zang

^1,2,*

,

Ming Zhao

³

,

Jinfeng Zhang

^1,2,

Botao Xie

⁴

and

Xing Zou

⁴

¹

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China

²

Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration, Tianjin University, Tianjin 300350, China

³

School of Engineering, Design and Built Environment, University of Western Sydney, Penrith 2751, Australia

⁴

CNOOC Research Institute Co., Ltd., Beijing 100028, China

^*

Author to whom correspondence should be addressed.

J. Mar. Sci. Eng. 2022, 10(12), 2019; https://doi.org/10.3390/jmse10122019

Submission received: 10 November 2022 / Revised: 12 December 2022 / Accepted: 14 December 2022 / Published: 17 December 2022

(This article belongs to the Special Issue CFD Analysis in Ocean Engineering)

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Abstract

When a pipeline is laid on the seabed, local scour often occurs below it due to sea currents. In practical engineering, there are some cases that two pipelines laid on the seabed need to cross with each other. The complex flow structures around two crossing pipelines make the scour characteristics different from that of an isolated single pipeline. In this study, scour below two crossing pipelines was simulated numerically using the CFD software Flow-3D. The study is focused on the effect of the intersecting angle on the equilibrium depth and time scale of scour below the crossing position. Five intersecting angles, i.e., α = 0°, 15°, 30°, 45° and 90°, are considered, where α = 0° and 90° represent two pipelines parallel and perpendicular to each other, respectively. The results show that the equilibrium depth and the time scale of scour below the two crossing pipelines are greater than those of an isolated single pipeline. The equilibrium depth and time scale of scour have the largest values at α = 0° and decrease with the increase of the intersecting angle. Finally, the flow structures around the crossing pipelines are presented to explain the scour process.

Keywords: crossing pipelines; local scour; flow structure; intersecting angle; numerical simulation

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MDPI and ACS Style

Zhang, F.; Zang, Z.; Zhao, M.; Zhang, J.; Xie, B.; Zou, X. Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed. J. Mar. Sci. Eng. 2022, 10, 2019. https://doi.org/10.3390/jmse10122019

AMA Style

Zhang F, Zang Z, Zhao M, Zhang J, Xie B, Zou X. Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed. Journal of Marine Science and Engineering. 2022; 10(12):2019. https://doi.org/10.3390/jmse10122019

Chicago/Turabian Style

Zhang, Fan, Zhipeng Zang, Ming Zhao, Jinfeng Zhang, Botao Xie, and Xing Zou. 2022. "Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed" Journal of Marine Science and Engineering 10, no. 12: 2019. https://doi.org/10.3390/jmse10122019

APA Style

Zhang, F., Zang, Z., Zhao, M., Zhang, J., Xie, B., & Zou, X. (2022). Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed. Journal of Marine Science and Engineering, 10(12), 2019. https://doi.org/10.3390/jmse10122019

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed

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