Article
Engineering, Marine
Santanu Koley, Kottala Panduranga, Kshma Trivedi, Alanoud Al-Ragum, Subramaniam Neelamani
Summary: This paper studies the wave-induced forces on a submarine pipeline buried in porous soil with different properties. The mathematical problem is solved using the higher-order boundary element method, and the numerical results are validated through rigorous model tests. Four different types of Kuwaiti marine soil: Al-Khiran, Al-Koot, Sabiya, and Shuaiba are considered. The study analyzes in detail the effects of burial depth, incident wave period and height, and hydraulic conductivity of the soils on the wave forces acting on the submarine pipeline. It is found that for moderate burial depth, the wave force can be reduced by up to 50% for soil with lower hydraulic conductivity. The measured wave forces and numerical predictions are well-matched for various wave, soil, and structural parameters.
Article
Engineering, Ocean
Xing-sen Guo, Ting-kai Nian, Ning Fan, Yong-gang Jia
Summary: This study investigates a protective technology for submarine pipelines using honeycomb-hole designs, which can delay boundary layer separation, reduce impact velocity, prolong arrival time, and decrease differential pressure drag force, providing new insights into design optimization methods.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2021)
Article
Engineering, Marine
Ru-Yu Li, Jin-Jian Chen, Chen-Cong Liao
Summary: Offshore installations with pile foundations in shallow water are at risk of submarine landslides, causing damage to engineering facilities, loss of life, and loss of money. A study using ANSYS Fluent 20.0 developed a three-dimensional biphasic numerical model to analyze the interaction between monopiles and submarine landslides, proposing two modes of interactional forces acting on the monopile.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Geological
Ida Agustin Nomleni, Wen-Yi Hung, Dicky Pratama Soegianto
Summary: Slope instability is a significant problem in geotechnical engineering, which can result in catastrophic failure and loss of human lives. It can be induced by internal or external factors, and earthquakes are one of the external factors. There has been significant development in slope protection, with a focus on ecological protection to replace environmentally unfriendly stabilization methods. Centrifuge modeling tests showed that fibrous root system is more suitable for reinforcing sandy soil slopes compared to taproot system.
Proceedings Paper
Engineering, Mechanical
Bipul Hawlader, Sujan Dutta, Anup Fouzder
Summary: Finite element modeling is widely used in civil engineering, but may face limitations in modeling certain geotechnical problems. In recent years, large deformation finite element modeling and computational fluid dynamics approaches have emerged as alternative techniques, particularly suitable for situations where the soil behaves like a fluid.
PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING (ICME2019)
(2021)
Article
Engineering, Geological
Cristian Yair Soriano Camelo, Maria Cascao Ferreira de Almeida, Marcio de Souza Soares de Almeida, Gopal S. P. Madabhushi, Sam Stanier
Summary: This paper presents the results and analysis of two centrifuge experiments simulating the seismic response of a gentle slope in soft clay. The experiments found that the slope angle and shaking intensity had an impact on the seismic response, with the six-degree slope experiencing three times greater permanent displacements than the three-degree slope.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Engineering, Geological
Tanawat Tangjarusritaratorn, Yuusuke Miyazaki, Mamoru Kikumoto, Kiyoshi Kishida
Summary: This paper presents a novel framework for describing seepage and particle flow phenomena in cohesionless soil, and conducts multiphase flow simulation based on this framework. The proposed method is validated through comparison with laboratory experiments, and the effects of two parameters on erosion behavior are discussed.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
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, Ocean
Xingsen Guo, Thorsten Stoesser, Cheng Zhang, Cuiwei Fu, Tingkai Nian
Summary: This study investigates the interaction between submarine landslides, ambient water, and pipelines using computational fluid dynamics (CFD) modeling and physical flume experiments. The effects of different boundary conditions on the impact forces on pipelines are explored, and the mechanism behind these force changes is explained through the analysis of velocity field, pressure field, and streamlines. A method for determining boundary conditions is proposed, providing a basis for optimizing CFD modeling in submarine landslide-pipeline interactions.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Chemical
Gizem Ozler, Mustafa Demircioglu, Holger Grosshans
Summary: In CFD simulations of two-phase flows, accurate drag force modeling is essential for predicting particle dynamics. However, a generally valid formulation is lacking, as all available drag force correlations have been established for specific flow situations. This paper reports the effect of drag force modeling on the flow of electrically charged particles.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Engineering, Geological
Jiangwei Shi, Yonghui Chen, Hu Lu, Shaokun Ma, C. W. W. Ng
Summary: This study investigates the influence of joint stiffness on pipeline response due to tunnel excavation through centrifuge tests, and finds that the flexible joints in the pipeline reduce the flexural stiffness, resulting in increased settlement and bending strain in the jointed pipeline.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Energy & Fuels
Maryelen H. Miyoshi, Nezia de Rosso, Cezar O. R. Negrao
Summary: This study accurately models the forces acting on the drill string assembly during pull-out, predicting whether a plug is formed, and demonstrates potential for detecting field problems.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Yumin Shi, Fuping Gao, Ning Wang, Zhenyu Yin
Summary: A coupled flow-seepage-elastoplastic modeling approach was proposed to simulate the instability of a partially embedded pipeline under ocean currents, verified through experimental and numerical results to establish an instability envelope. The competition mechanism between tunnel erosion and lateral instability was revealed, with a transition line on the envelope indicating the switch between the two instability modes.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Thanh-Trung Vo, Trung-Kien Nguyen
Summary: This paper provides numerical insights into the uplifting process of a circular plate intruder within cohesive and non-cohesive granular assemblies using a three-dimensional discrete element method. The results show that the uplift rate of the intruder increases with increasing the pulling force, but decreases with increasing the size and embedment depth of the intruder for both cohesive and non-cohesive granular materials. Additionally, the results highlight the different linking dynamics between the intruder and granular assemblies.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Acoustics
Xia Liu, Tengfei Zheng, Chaohui Wang
Summary: In this study, a 3D model is presented to investigate the application of surface acoustic wave (SAW) technology in manipulating micro-nano particles. The distribution of acoustic pressure and acoustic streaming in a microchannel is studied using the improved limiting velocity method (ILVM). The motion of micro-particles of different diameters under the interaction of acoustic radiation force and drag force is simulated, showing that particles can move in three dimensions. These findings and methods are crucial for designing SAW microfluidic chips and precisely controlling particle motion.
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.