Article
Engineering, Marine
Haiyang Pan, Hong-Nan Li, Chao Li
Summary: This study numerically investigates the seismic behaviors of a free-spanning submarine pipeline using multisupport earthquake motions within offshore sites (MEMOSs) as inputs, considering the influences of factors like MEMOSs, coherence loss, local site condition, and free-span length. Results show that the middle and ends of free span are the dangerous regions, and factors like MEMOSs, coherence loss, local site condition, and free span length significantly affect the seismic responses and operational capacity of the pipeline. Suggestions are made for pipeline designers based on these results.
Article
Engineering, Marine
Ri Zhang, Kai Xu, Yong Liu, Haixiao Liu
Summary: A general numerical method is developed to analyze solid particle erosion in gas-liquid mixed pipeline. Particle trajectories are tracked as an important intermediate step. The method considers the random effects of gas and liquid phases on particle trajectories, as well as the influence of surface tension. The numerical procedure is verified by comparison with experimental data and the effects of phase volume fraction and surface tension are discussed.
Article
Engineering, Marine
Yang Shi, Haotian Yang, Jiahua Wei, Haitao Yu, Ye Liu, Sai Ge, Zhigang Bai, Shaowu Li
Summary: Local scour near a submarine pipeline is a significant factor leading to pipeline damage and failure. Previous studies mainly focused on fluid flow and sediment transport, neglecting the influence of vibration on the scour process. This study establishes a two-dimensional scour model based on the time-averaged N-S equation to analyze the local scour and vortex-induced vibration of the pipeline.
Article
Engineering, Marine
Xingsen Guo, Xiaolei Liu, Cheng Zhang, Shaodong Jing, Fang Hou
Summary: This study analyzes the impact of submarine turbidity currents on fixed spanning pipelines using large eddy simulation method. The findings suggest that the lift force on the pipeline is significant under high-Reynolds number conditions, and the vortex shedding frequency increases with increasing Reynolds number.
Article
Engineering, Marine
Weixing Liang, Min Lou, Changhong Fan, Deguang Zhao, Xiang Li
Summary: This study investigates the coupling effect of vortex-induced vibration and local scour on submarine pipelines using Flow-3D. The horizontal gap between the pipelines is found to significantly influence the depth and profile of the scour pits. When the horizontal gap ratio is G/D = 2, pipeline vibrations promote the merging of scour pits. With increasing horizontal gap, the interference effect between the pipelines weakens, leading to a decrease in the depth difference of scour pits below the fixed and vibrating double pipelines. Additionally, when G/D & GE; 3, the vortices falling off the upstream and downstream pipelines are discharged separately, resulting in weak interference and the formation of two independent scour pits.
Article
Engineering, Civil
Mustafa Dogan, Yalcin Arisoy
Summary: This study experimentally investigated the development of scour holes along the spanwise direction of submarine pipes and the propagation velocity of scour in a large wave channel. The results showed that the scour propagation velocity along the spanwise direction of the submarine pipe is inversely related to the Keulegan-Carpenter number under clear-water conditions.
COASTAL ENGINEERING
(2021)
Article
Engineering, Marine
Zhiyong Zhang, Yakun Guo, Yuanping Yang, Bing Shi, Xiuguang Wu
Summary: This study conducted laboratory experiments to investigate scour characteristics around submarine pipelines under bidirectional tidal currents. The results showed that scour depth increased significantly in the first half of the tidal cycle and was more symmetrical under bidirectional tidal currents. A more accurate prediction equation for tidally induced live-bed scour depth around submarine pipelines was proposed based on experimental data and has been verified with field measurements.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Ocean
Cuiwei Fu, Tingkai Nian, Xingsen Guo, Zhongde Gu, Defeng Zheng
Summary: This paper investigates the responses and capacity of offshore pipelines subjected to submarine landslides through a series of numerical simulations. Equivalent boundary conditions are proposed and parametric studies are conducted to formulate the normalized critical impact force. Design charts are achieved to predict the critical impact force and evaluate pipeline safety under the impact of submarine landslides.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Marine
Junjie Zhu, Bing Ren, Ping Dong, Weidong Chen
Summary: This paper investigates the vortex-induced vibrations (VIV) of a free spanning submarine power cable in steady currents. The experimental results show that the cable's natural frequencies and mode shapes are affected by the sag, resulting in a multi-mode response. Among the excited modes, the vibration of the first symmetric mode is significantly suppressed.
Article
Chemistry, Multidisciplinary
Junguo Cui, Yuyin Wu, Zhongqi Lu, Wensheng Xiao
Summary: A new corrosion failure prediction model for submarine oil and gas transport pipelines was constructed and a management system based on the model was developed. Through experimental analysis, the influences of temperature, partial pressure of CO2, pH value, and flow rate on corrosion rate were analyzed. The proposed model showed good prediction accuracy, which was further verified by comparing with a machine learning prediction model.
APPLIED SCIENCES-BASEL
(2023)
Article
Computer Science, Interdisciplinary Applications
Huihuan Ma, Boen Li, Shuye Zhang
Summary: In order to study the meso-mechanism of scouring process, a numerical model called PORO-CFD-DEM that combines the porous medium model, computational fluid dynamics, and discrete element method is developed and validated. Two pipeline conditions, suspended and partially buried, are considered. The model is capable of capturing the movement patterns of particles and providing insights into sediment transportation theory.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Marine
Enjin Zhao, Youkou Dong, Yuezhao Tang, Junkai Sun
Summary: This study investigates the joint effect of solitary waves and background currents on submarine pipelines in extreme marine environments through numerical simulations. The hydrodynamic characteristics, forces, and local scour around the pipeline are found to be closely related to background current velocity, pipeline diameter, and layout. The findings enhance understanding of the damage mechanism of submarine pipelines by waves and provide insights for future pipeline design practices.
Article
Engineering, Marine
Wei Wang, Xiaoning He, Yuntao Li, Jian Shuai
Summary: This paper dynamically analyzes and evaluates the corrosion risk of submarine pipelines using a combination of fault tree model and Bayesian network, and provides suggestions for risk reduction.
Article
Construction & Building Technology
Fan Cui, Yunfei Du, Xianjie Hao, Suping Peng, Zhuangzhuang Bao, Shiqi Peng
Summary: This study investigated the physical model of water-damage disasters under different particle size riverbed sediment conditions with pipelines buried at various depths. The results showed that the equilibrium scour depth formed by the fine sand riverbed was the largest.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Engineering, Marine
Liu Ming-Ming, Wang Hao-Cheng, Shao Fei-Fei, Jin Xin, Tang Guo-Qiang, Yang Fan
Summary: This paper presents a developed two-dimensional finite element numerical model to predict local scour around a vibration submarine pipeline under free surface wave condition. The model considers both suspended load and bed load sediment transportations and uses the Arbitrary Lagrangian-Eulerian method to track the moving boundaries. The results show that vibration leads to deeper scour depth and wider scour scope around the pipeline.
