Numerical analysis of seabed liquefaction in the vicinity of two tandem pipelines in a trench

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Chen, X
Jeng, DS
Liang, Z
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2022
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http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract

In engineering practice, pipeline trenching has been adopted as one of effective protection options. Most previous studies mainly focused on the prediction of the seabed response around a single pipeline, although two tandem pipelines have been used in engineering practice for transporting hydrocarbons. This study aimed to investigate the wave–current induced liquefaction around two tandem pipes in a trench. A series of simulations were performed to explore the effect of the horizontal gap ratio of dual pipes in a shared trench on the seabed response, and the results were compared with a single trenched pipe. In the numerical model, we used an integrated two-dimensional model that was developed based on the Finite Volume Method (FVM) in OpenFOAM®. In terms of the flow field, VARANS (Volume-Averaged Reynolds Averaged Navier–Stokes) was applied to simulate the fluid motion, while Biot's consolidation equation was used to govern the seabed model. The numerical examples indicate that twin pipelines semi-buried in close proximity within the same trench significantly impact the flow patterns and seabed response around them. Furthermore, the self-weight of dual pipes, ocean currents and trench configuration have a considerable influence on the evaluation of the liquefaction distribution around two tandem pipelines in a trench.

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Ocean Engineering
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266
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Part 1
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© 2022 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
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Ocean engineering
Civil engineering
Fluid mechanics and thermal engineering
Maritime engineering
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Chen, X; Jeng, DS; Liang, Z, Numerical analysis of seabed liquefaction in the vicinity of two tandem pipelines in a trench, Ocean Engineering, 2022, 266 (Part 1), pp. 112656
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