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Safety and Reliability

CFD Numerical Simulation of the Submarine Pipeline With a Spoiler

[+] Author and Article Information
Jianping Zhao1

School of Mechanical Engineering, Nanjing University of Technology, Nanjing 210009, Chinajpzhao@njut.edu.cn

Xuechao Wang

School of Mechanical Engineering, Nanjing University of Technology, Nanjing 210009, China

1

Corresponding author.

J. Offshore Mech. Arct. Eng 131(3), 031601 (May 28, 2009) (5 pages) doi:10.1115/1.3124127 History: Received February 28, 2008; Revised December 04, 2008; Published May 28, 2009

Submarine pipeline is one of the most important oil transportation components; pipeline failure due to overspan is the most serious failure mechanism. There are four reasons of pipeline span formation, including erosion of seabed, bumpy seabed, submarine pipeline climbing slope, and pipeline ascending to offshore platform. The Hangzhou Bay submarine pipeline is the most important subproject of the Yong-Hu-Ning network, and it is also the biggest long-distance pipeline for crude oil in China. Due to the dynamic nature of Hangzhou Bay, including high tides and high current amplified by the shallow waters, a self-burial method was selected as the best solution. By increasing the velocity of the stream between the pipeline and the seabed, shear stress on the seabed was enhanced. This localized increase in shear stress causes the seabed under the pipe to erode more quickly and facilitates self-burial of the pipe. To facilitate self-burial, a nonmetallic vertical fin is fastened to the top of the pipeline. In this paper flow around a pipeline with and without a spoiler near a smooth wall is simulated with FLUENT version 6.1. It is found that the velocity affected the shear stress, and the height of the spoiler does not have an obvious effect on the shear stress.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 8

Flow velocity contour for e=D/4 with a spoiler

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Figure 9

Flow velocity contour for e=D without a spoiler

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Figure 10

Flow velocity contour for e=D with a spoiler

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Figure 11

Mean shear stress on the seabed

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Figure 7

Flow velocity contour for e=D/4 without a spoiler

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Figure 6

Flow velocity contour for e=D/8 with a spoiler

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Figure 5

Flow velocity contour for e=D/8 without a spoiler

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Figure 4

Grid mesh around the circular pipe

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Figure 3

Flow around pipeline in tunnel erosion phase (7)

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Figure 2

Hangzhou bay submarine pipeline crossing route

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Figure 1

The structure of the spoiler

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