CFD Simulation of Impact Force of Submarine Debris Flows on Suspended Pipelines

ZHANG Yu; QU Tong

doi:10.13409/j.cnki.jdpme.20231104002

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CFD Simulation of Impact Force of Submarine Debris Flows on Suspended Pipelines

更新时间：2025-03-10

- CFD Simulation of Impact Force of Submarine Debris Flows on Suspended Pipelines
- Journal of Disaster Prevention and Mitigation Engineering Vol. 45, Issue 1, Pages: 215-223(2025)
- 作者机构：
  
  大连交通大学交通工程学院，辽宁大连 116028
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20231104002
  CLC： TU432
- Received：04 November 2023，
  
  Revised：2024-04-03，
  
  Published：15 February 2025
- 稿件说明：
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张宇,曲仝.海底泥屑流对悬跨管线冲击力的CFD模拟[J].防灾减灾工程学报,2025,45(01):215-223.

ZHANG Yu,QU Tong.CFD Simulation of Impact Force of Submarine Debris Flows on Suspended Pipelines[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(01):215-223.
张宇,曲仝.海底泥屑流对悬跨管线冲击力的CFD模拟[J].防灾减灾工程学报,2025,45(01):215-223. DOI： 10.13409/j.cnki.jdpme.20231104002.

ZHANG Yu,QU Tong.CFD Simulation of Impact Force of Submarine Debris Flows on Suspended Pipelines[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(01):215-223. DOI： 10.13409/j.cnki.jdpme.20231104002.

摘要

海底管线作为运输海底油气资源的重要通道，具有生产安装方便、运输距离远、运输效率高等优势，被广泛应用于海洋油气工程。使用计算流体动力学方法研究了海底泥屑流对悬跨高度为一倍管线直径状态下管线的冲击作用。通过在管线背冲击侧增大加密网格区域的方法，铺捉到泥屑流冲击管线过程中涡流脱落现象，讨论了加密网格模型模拟嵌入阶段管线受力规律的必要性。数值模拟结果表明，加密网格模型可以更好地模拟雷诺数较大工况中管线的法向和竖向受力规律，具体表现为：对于管线法向受力，当雷诺数小于113.05时，管线法向受力峰值与初始冲击阶段峰值相同；当雷诺数大于113.05时，受涡流脱落影响，法向受力峰值出现在嵌入冲击阶段。对于管线竖向受力，在冲击过程中管线受力表现出一定的周期性，在模拟的雷诺数范围（21.89~317.08）内，管线竖向受力峰值均出现在嵌入冲击阶段；随着雷诺数的增大，管线竖向受力峰值最大可达初始阶段峰值5倍以上。基于计算数据，得到了不同雷诺数条件下法向受力峰值和竖向受力峰值受力系数计算表达式。研究得到的规律和公式对完整地评价泥屑流对海底管线的冲击过程具有重要价值。

Abstract

Submarine pipelines

as important channels for transporting underwater oil and gas resources

offer advantages such as convenient production and installation

long transportation distances

and high transportation efficiency

and are widely used in marine oil and gas engineering. This study used Computational Fluid Dynamics (CFD) to investigate the impact of submarine debris flows on suspended pipelines under a suspended height equivalent to the pipeline diameter. The impact of the debris flows on the pipelines was studied by refining the mesh near the back impact side of the pipelines to capture vortex shedding during the debris flows' collision with the pipelines. The necessity of using a refined mesh model to simulate the pipelines' forces during the embedding stage was discussed. The numerical simulation results showed that the refined mesh model could more accurately simulate the normal and vertical forces on the pipelines under the conditions of high Reynolds numbers. Specifically

for the normal force on the pipelines

when the Reynolds number was less than 113.05

the peak normal force was the same as the peak force during the initial impact stage. When the Reynolds number exceeded 113.05

vortex shedding caused the peak normal force to occur during the embedding impact stage. For the vertical force on the pipelines

a certain periodicity was observed during the impact process. Within the simulated Reynolds number range (21.89 - 317.08)

the peak vertical force on the pipelines always occurred during the embedding impact stage. As the Reynolds number increased

the peak vertical force could be more than 5 times the initial peak value. Based on the calculated data

expressions for calculating the normal and vertical peak force coefficients under the conditions of different Reynolds numbers were obtained. The patterns and formulas obtained in this study are crucial for fully evaluating the impact process of debris flows on submarine pipelines.

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references

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