Article
Engineering, Marine
Zhenkui Wang, Yougang Tang, C. Guedes Soares
Summary: Controlled lateral buckling triggered by distributed buoyancy section is simulated using an analytical model, which shows that large initial imperfections do not lead to snap-through behavior, while the displacement amplitude increases with the amplitude of initial imperfections.
Article
Engineering, Marine
Zhenkui Wang, Nuo Duan, C. Guedes Soares
Summary: This study investigates controlled lateral buckling triggered by imposed residual initial imperfections along subsea pipelines. Mathematical models and analytical solutions are proposed and validated by comparing with FEA results. The results show that selecting an appropriate wavelength of initial imperfection and reducing the distance between adjacent initial imperfections can mitigate maximum stress and reduce displacement amplitude.
Article
Engineering, Marine
Zhenkui Wang, Yougang Tang, C. Guedes Soares
Summary: The study proposed mathematical models to simulate lateral buckling of subsea pipelines by considering nonlinear pipe-soil interaction and initial imperfections. Results show that hysteresis cycle may appear between pre-buckling and post-buckling states under cyclic thermal loading.
Article
Engineering, Marine
Zhenkui Wang, C. Guedes Soares
Summary: In this study, a mathematical model is proposed to simulate upheaval buckling of lined subsea pipelines based on nonlinear assumptions and beam theory. Analytical solutions are derived and validated against literature results. The study analyzes the influence of material properties and thickness ratio on post-buckling response, and compares the behavior of the outer pipe and liner in upheaval buckling.
Article
Chemistry, Multidisciplinary
Songxian Wang, Lichen Li, Wenbing Wu, Tianwei Wang, Hao Liu
Summary: The study introduces a fixed-fixed beam model to simulate the lateral buckling response of submarine pipelines. This model considers the suppression tension provided by the virtual anchor point during the pipeline feeding-in process, which reduces the buckling response phenomenon of the pipeline. The effectiveness of the fixed-fixed model is verified by comparing with analytical solutions in other literature, and the influence of imperfection model, temperature difference, and soil resistance on pipeline buckling is investigated.
APPLIED SCIENCES-BASEL
(2023)
Review
Engineering, Marine
Fengming Du, Cong Li, Weiwei Wang
Summary: Oil and gas exploration plays a crucial role in the global economy and contributes significantly to its development. The safety of subsea pipelines is greatly affected by issues such as buckling, corrosion, and leakage. Serious leaks or damages to subsea pipelines can lead to wastage of resources and even explosions, causing severe casualties and economic losses, as well as detrimental effects on the surrounding ecological environment. Therefore, it is important to address problems related to the buckling, corrosion, and leakage of submarine pipelines. This paper provides a literature review of the latest research on buckling, corrosion, and leak detection.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Ocean
Navid Vosooghi, Ana Ivanovic, Srinivas Sriramula
Summary: This paper provides a framework for studying the impact of rogue lateral deviations on buckle initiation in High Pressure High Temperature pipelines, describes a pipe-soil interaction model suitable for sandy seabeds, and develops a novel Finite Element modeling technique for decoupling lateral buckling forces.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Marine
Hang Wu, Haisheng Zhao, Yanfei Chen, Xin Li, Xin Feng
Summary: This study analyzes the buckling response of subsea pipelines with irregular corrosion defects. A method for calculating the critical buckling pressure of pipelines with irregular corrosion defects is proposed and its accuracy is verified by comparison with finite element (FE) results and experimental tests. The effects of defect size, steel grade, and diameter-to-thickness ratio on defect interaction and critical buckling pressure are explored. The application range of the method is extended by considering defect length, initial ovality, and internal pressure.
Article
Engineering, Marine
Jie Zhang, Zhenkui Wang, C. Guedes Soares
Summary: This study analyzed the lateral buckling of subsea pipelines triggered by a sleeper with lateral constraint, confirming that the lateral constraint can decrease the maximum deflection and stress along the buckled pipeline.
Article
Mechanics
Zbigniew Kolakowski, Andrzej Teter
Summary: This study addresses the estimation of values of local bifurcational loads in plate structures with moderate geometrical inaccuracies, suggesting a way to include the effect of these inaccuracies on the estimated loads. By not considering these inaccuracies, there is a risk of underestimating the bifurcational loads and causing a scattering of results. Various methods were developed and verified through finite element method simulations, showing good agreement between the new methods and theoretical solutions.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Ocean
Zhenkui Wang, Yougang Tang, Nuo Duan
Summary: This study proposes mathematical models to simulate lateral buckling of subsea pipelines triggered by dual sleepers and compares the results with previous literature. The influence of dual sleepers on buckled configuration and post-buckling behavior, along with a parametric analysis regarding critical temperature difference, displacement amplitude, and maximum stress, is discussed in detail. The study shows that the formula derived can effectively simulate both single and dual sleepers for triggering lateral buckles, providing insights on how to control the sleeper friction coefficient to reduce critical temperature difference and maximum stress.
APPLIED OCEAN RESEARCH
(2021)
Article
Chemistry, Physical
Zbigniew Kolakowski, Andrzej Teter
Summary: This study discusses the phenomena that occur during compression of hybrid thin-walled columns with open cross-sections in the elastic range and solves nonlinear buckling problems within Koiter's approximation theory. A multimodal approach was utilized to investigate the effects of symmetrical and anti-symmetrical buckling modes on the ultimate load-carrying capacity, showing that the nonlinear solutions comply within these two approaches.
Article
Engineering, Marine
Zhenkui Wang, G. H. M. van der Heijden
Summary: The study focuses on lateral thermal buckling of unburied subsea pipelines under high-temperature conditions, finding genuine localized buckling phenomenon with homoclinic boundary conditions instead of specific buckling modes. Sudden jumps between modes may occur in soils with appreciable breakout resistance, while symmetric and antisymmetric solutions require different temperature differences for inducing jumps. Parameter study on pipe-soil interaction parameters and post-buckling solutions are also conducted.
Article
Mechanics
Jaroslaw Gawryluk, Andrzej Teter
Summary: This study investigates the behavior of real short thin-walled laminated angle columns subjected to uniform shortening through numerical analysis and experiments. The obtained numerical and experimental results show very good agreement.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Yang Yu, Zhenmian Li, Jianxing Yu, Lixin Xu, Siyuan Cheng, Jingyi Wu, Huakun Wang, Weipeng Xu
Summary: This study investigated the buckling failure analysis of buried subsea pipelines under reverse fault displacement, considering nonlinear soil-pipeline interaction and multiple nonlinearities. The results show that subsea pipelines have a large deformation capacity, with external pressure being more unfavorable than internal pressure.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Geological
Fan Chen, Hao Xiong, Xiang Wang, Zhen-Yu Yin
Summary: The influence of the transmission effect on suffusion is investigated in this study, and it is found to have both enhancing and inhibitory impacts. The macroscopic and microscopic impacts of the transmission effect on suffusion are analyzed, as well as the force-chain network and anisotropic characteristics of specimens.
Article
Computer Science, Interdisciplinary Applications
Hao Xiong, Yuanyi Qiu, Xing-Tao Lin, Xiangsheng Chen, Dawei Huang
Summary: This paper proposes a coupling approach involving the Finite Element Method (FEM) and Smoothed Particle Hydrodynamics (SPH) method to investigate the multiple soil arching effects of cohesive-frictional soils. The approach is successfully validated by comparing numerical results with experimental observations. A sensitivity analysis reveals the influence of geometric and material parameters on load transfer, deformation behaviors, and failure mechanisms. The mobilization of soil particles is analyzed to explain the formation of multiple soil arches. The interaction between adjacent soil arches is identified by analyzing the inclinations of the failure surfaces, and the evolution of the equal settlement plane and failure surfaces during the arching process is discussed.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Fan Chen, Siqi Jiang, Hao Xiong, Zhen-yu Yin, Xiangsheng Chen
Summary: Filter layers play an important role in mitigating internal erosion in dam structures. A series of tri-layer CFD-DEM models was used to study the effect of particle size distribution (PSD) on its retention capability. The results showed that different PSDs of filter media had varying degrees of impact on internal erosion. The correlation between pore size and erosion results provided a reference for quantifying the mitigation effect of the filter soil medium.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Xiaohui Sun, Ziyi Chen, Keyu Guo, Jianbo Fei, Zijun Dong, Hao Xiong
Summary: The study investigated the use of geopolymeric flocculation-solidification to replace the inefficient flocculation and filter-pressing method currently used for tunneling spoil. The geopolymeric agent demonstrated superior flocculation effect and efficient dewatering of the slurry, producing solidified sediments with considerably higher strength compared to cementitious agents. The GBFS-FS agent also showed improved fluidity and strength in producing controlled low-strength material (CLSM). SEM test indicated that the components of the geopolymeric agent interact to prevent large flocs and support strength growth.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiaofeng Zhao, Kaihang Han, J. Woody Ju, Xiangsheng Chen, Weitao Chen, Hao Xiong
Summary: This article investigates the effect of segmental tunnel linings of different sizes on deformation behavior and damage evolution mechanism using the Finite Element Method (FEM). Models with different diameters were established under the same loading condition to compare convergence deformation, internal force, and damage. Plastic hinge theory was used to explain the differences in damage evolution mechanisms in different-sized linings. The results show that large-diameter linings have a greater rate of convergence deformation and fewer plastic hinges before reaching ultimate strength. The failure of large-diameter linings is characterized by more brittle damage and instability compared to small-diameter linings.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2023)
Article
Engineering, Geological
Fan Chen, Hao Xiong, Zhen-Yu Yin, Xiangsheng Chen
Summary: A computational model was developed to simulate the formation and long-term impermeable stability of filter cakes in slurry infiltration. The study considered different infiltration conditions and analyzed the macroscopic morphology and pressure drops of formed filter cakes. The numerical results showed the impact of sand-to-slurry particle size ratio and slurry cohesion on the formation and stability of filter cakes subjected to dynamic hydraulic loads.
Article
Engineering, Environmental
Hanqing Chen, Xin Li, Hao Xiong, Xiangsheng Chen, Dong Su
Summary: In order to understand the inhibition mechanism of overburden pressure on water migration in freezing soil, this study analyzed the pressure-suction coexistence state of film water and found that ice pressure offsets and balances theoretical suction, resulting in a surface adsorption force that drives water migration. Based on this, a mechanical model of the pressure-suction coexistence state was introduced into the frozen fringe theory, revealing that as the overburden pressure increases, the surface adsorption force increases while the total permeability coefficient of the frozen fringe decreases. A theoretical model of segregation frost heave under pressure was established and an explicit equation for water migration velocity was derived. Experimental results from a frost heave loading test on saturated silt under open-system conditions confirmed the accuracy of the model. In summary, the proposed model has significant theoretical and practical significance for improving the existing frost heave theory.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Hao Xiong, Yuanyi Qiu, Jiaying Liu, Zhen-Yu Yin, Xiangsheng Chen
Summary: This paper presents a numerical analysis of suffusion mechanisms in three representative volume elements under cyclic seepage. The effect of particle breakage on cyclic suffusion is assessed through varying breakage ratios. The study reveals that mass loss is intensified by particle breakage but is effectively inhibited under high-stress conditions. Fine particles exhibit different migration behaviors and the connectivity of the particle assembly weakens during cyclic seepage. Anisotropy in the normal contact force distribution increases as more particles are eroded.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Hao Xiong, Zhimin Zhang, Jie Yang, Zhen-yu Yin, Xiangsheng Chen
Summary: In this study, a numerical model using the coupled computational fluid dynamics and the discrete element method (CFD-DEM) is used to simulate the suffusion evolution of different fabric anisotropy configurations. The results show that the inherent anisotropy has a significant impact on the pore structure and the motion behavior of fine particles, subsequently affecting the stress transmission within the granular skeletons. These insights contribute to the fundamental understanding of suffusion and the development of strategies for predicting and controlling geotechnical and environmental engineering catastrophes.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Geosciences, Multidisciplinary
Dong Su, Runqi Zhang, Hao Xiong, Debo Zhao
Summary: Rockfall is a highly destructive natural disaster. The interactions between discrete and continuum elements in rockfall protection have not been well understood. This study combines the finite element method with the discrete element method to simulate the impact dynamics of falling boulders and analyze the responses of protective structures under different loading conditions. The results show that the size and velocity of the boulders affect the impact behavior, while the interactions between the gravel cushion and the concrete structure play a significant role. The numerical results also indicate that the rotational velocity and energy distribution of the blocks are influenced by the size and velocity. Strengthening is observed in the cushion layer after impact, and the tensile stress is concentrated on the crown of the retaining wall and the inner part of the pile root. However, this type of protection may obstruct large boulders, suggesting the need for additional structures in the protection scheme.
Article
Engineering, Marine
Xiaohua Bao, Han Wu, Hao Xiong, Xiangsheng Chen
Summary: This study investigates submarine granular collapse by incorporating the complex particle shape factor into computational fluid dynamics-discrete element method (CFD-DEM) simulations. Dry and submarine tests are conducted to validate the numerical results against experimental observations. The relationship between the final deposit state and the initial aspect ratio of the specimen for submarine tests is summarized. The impact of particle shape on submarine granular collapse is examined, with polyhedral particles' aspect ratio, angularity, and roughness studied in terms of their dynamic processes and final deposit profiles. The proposed CFD-DEM coupling approach is leveraged to analyze the evolution of granular force fabric and the distribution of excess water pressure for different particle shapes.
Article
Engineering, Marine
Zhimin Zhang, Hao Xiong, Yuanyi Qiu, Rui Tang
Summary: This study uses a hybrid CFD-DEM approach to accurately simulate the settling behavior of polyhedral particles in water. The results show that particle shape has a significant influence on the particles' mechanical behavior and hydrodynamic characteristics.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Hao Xiong, Zhimin Zhang, Xiaohua Bao, Han Wu, Zhen-yu Yin, Xiangsheng Chen
Summary: This study investigates the effects of particle shape on suffusion process by considering complex particle shape factor and conducting numerical tests. The results indicate that particle shape plays a significant role in suffusion.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Rui-Xiao Zhang, Dong Su, Xing-Tao Lin, Hao Xiong, Xiang-Sheng Chen
Summary: This study investigates the effects of existing tunnels on the evolution of soil arching. By using discrete element method simulations and establishing a numerical model based on experiments, trapdoor models with different distances between the trapdoor and tunnel are examined. The results indicate that increasing the distance between the tunnel and trapdoor weakens the soil arching effect, with the critical distance being between 150 and 200 mm. Additionally, the displacement of the trapdoor increases the anisotropy of contact forces within the soil mass.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Hao Xiong, Junfeng Sun, Fan Chen, Zhen-Yu Yin, Xiangsheng Chen
Summary: This study investigates the continuous suffusion of calcareous sand-filled soil foundations under reversed hydraulic conditions from a microscopic perspective. It finds that hydraulic gradient and cyclic frequency are the primary factors affecting suffusion outcomes, and identifies the microscopic origins of continuous suffusion.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.