Numerical study on the interaction between waves and twin pipelines in sandy seabed

Zhang, Jisheng; Zheng, Jinhai; Zhang, Chi; Jeng, Dong‐Sheng; Guo, Yuhan

doi:10.2112/si65-073.1

Cited by 10 publications

(4 citation statements)

References 10 publications

(16 reference statements)

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“…Because of its practical importance, and potential engineering applications, extensive investigations on the interaction between waves, seabed, and pipelines have been conducted in recent years, using both theoretical and experimental approaches [5,6]. However, understanding the results of studies on wave-seabed-trenched pipelines, with different backfilled depths, remains incomplete.…”

Section: Introductionmentioning

confidence: 99%

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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The phenomenon of wave-seabed-pipeline interactions is one of the primary concerns of coastal engineers and researchers, as it could greatly affect the seabed instability and pipeline safety. Numerous researchers have expended great effort in studying wave-seabed-pipeline interactions in the past. However, the majority of them focussed on the wave-induced response around a submarine pipeline, in buried conditions, by numerical models and laboratory experiments. Unlike the previous studies, a series of regular wave experiments and numerical model analyses were conducted to investigate the wave-induced pore pressure in the sandy seabed, around a pipeline with different backfilled depths. The model pipeline with three diameters (D = 6 cm, 8 cm, and 10 cm) is buried in three sizes of sand, d50=0.15 mm, d 50 =0.3 mm, and d 50 =0.5 mm, with different backfilled depths. The results show that the pore pressure amplitude in the seabed is a minimum with a backfilled depth D, and a maximum with full backfill or a backfilled depth of zero. The pore-pressure amplitude increases as the backfill sand median diameter increases. The effects of the pipeline diameter on pore-water pressure are also analysed and discussed.

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Section: Introductionmentioning

confidence: 99%

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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“…The main objective here is the selection of the geometric characteristics of the damper and the analysis of the effectiveness of the pressure reduction [14]. In contrast to the models, in the paper the different types of cameras expansion cavity damper [15][16][17].…”

Section: E P Kolpak and S E Ivanovmentioning

confidence: 99%

Mathematical and computer modeling vibration protection system with damper

Kolpak¹,

Ivanov²

2015

ams

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The mathematical model of the mechanical system, which is a section of the pipeline with built-in motor pump system and damper for vibration damping, has been developed. The mathematical model is represented by a system of partial differential equations of hydrodynamics for moving fluid in the pipeline and a system of two ordinary differential equations for the damping device. Solution the system of equations is performed using analytical and numerical methods. The numerical solution of the equations of hydrodynamics carried out using the finite element method, implemented in the programming environment of mathematical package freeFEM ++.

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“…Jo et al [16] simulated dual pipelines in trenches, and the results indicate that both the depth and slope of the trench can affect the stability of the pipeline. Zhang et al [17] studied the effects of burial depth and center spacing on the interaction between double-row pipelines under wave actions through a numerical simulation. The results indicate that both the burial depth of the pipeline and the relative position between the two pipelines can affect the distribution of pore pressure around the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Wave–Current-Induced Liquefaction under Twin Pipelines Using the Coupling Model

Zhang

Cui

Zhai

et al. 2023

JMSE

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Although twin pipelines in series have been used to transport hydrocarbons in engineering practice, most previous studies focused on the dynamic response of the seabed around a single pipeline. A two-way coupling model of fluid–structure–seabed interaction (FSSI) is proposed for the study of the soil response and liquefaction caused by waves and currents around twin pipelines. The present model integrates the flow model and the seabed model by introducing a boundary condition of velocity continuity in addition to the continuity of pressures at the seabed surface. Then, the inconsistency between the physical process and numerical simulation can be overcome in the one-way coupling model. Through a series of numerical simulations, the influence of different flow characteristics, soil properties, and pipeline configurations on the seabed response under the two-way coupling process were explored, and compared with the results of the single pipeline. The numerical results indicate that the twin pipeline configuration significantly alters the relevant responses compared to the single pipeline configuration, including the after-consolidation state, amplitude of velocity at the seabed surface, and distribution of pore pressure in the seabed. The parametric studies show that the amplitudes of the wave and current have significant impacts on the distribution of pore pressure in the seabed. The pore pressure in the seabed increases with the increase of forward wave current, while the results of reverse wave current are the opposite. In addition, the liquefaction range around the pipeline increases with the increase of Hw and Tw, and increases with the decrease of Sr and ks. At the same time, the gaps (G) and the ratio of pipe radius (R1/R2) between the twin pipelines also significantly affect the seabed response and liquefaction distribution around the pipeline.

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Numerical study on the interaction between waves and twin pipelines in sandy seabed

Cited by 10 publications

References 10 publications

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Mathematical and computer modeling vibration protection system with damper

Assessment of Wave–Current-Induced Liquefaction under Twin Pipelines Using the Coupling Model

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