Article
Engineering, Marine
Chang Shi, Xide Cheng, Zuyuan Liu, Kunyu Han, Penghui Liu, Long Jiang
Summary: This study investigates the mechanism and characteristics of the wave-making wake generated by underwater vehicles in density-stratified fluid during maneuvering motion. As the drift angle increases, the wake of the vehicle continues to exhibit obvious Kelvin wave system characteristics, with increased asymmetry in the surrounding flow field.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Automation & Control Systems
Chunyu Song, Xianku Zhang, Guoqing Zhang
Summary: This research presents a 4-DOF ship maneuvering modeling based on full-scale trial data and proposes a new multi-innovation least squares algorithm for identifying nonlinear innovations in ship maneuvering motion. The design scheme shows significant computational advantages, higher accuracy, and faster identification speed.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Marine
Mohammad Abbaszadeh, Mohammad Mehdi Alishahi, Homayoun Emdad
Summary: The study found that small bubbles have a strong influence on the ship's wake, while the wetness of the stern also plays a significant role in the wake formation. In similar conditions, the wake of the larger model is stronger, and the Froude and Weber numbers are important for scaling the major features of the bubbly wake.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Engineering, Marine
Lei Du, Osiris A. Valdez Banda, Zhongyi Sui
Summary: This study proposes a collision alert system based on the perceived risk by the navigator, utilizing available maneuvering margins and a non-linear velocity obstacle method. The system accurately detects collision risk and issues corresponding collision alerts. The proposed system has the potential to assist autonomous ships in understanding the risk level and determining the timing for evasive maneuvers.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Mohammad Abbaszadeh, Mohammad Mehdi Alishahi
Summary: This paper proposes a novel approach that combines experimental and numerical simulation to study the evolution of bubbly wake of ship models in confined towing tank basins. It utilizes optical light scattering measurements to obtain near-field bubbly wake characteristics and computational fluid dynamic tools to analyze wake attenuation in the far-field region. The results demonstrate the differences in bubbly wake properties between confined and unconfined mediums, and emphasize the importance of bubble dissolution and buoyant effects in the attenuation of bubbly wake in the far-field region.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Marine
Jie Zhang, Faisal Gidado, Abdulmalik Adamu, Zhanhao Guo, Guangjun Gao
Summary: This study investigates the near-wake flow topology of a ship using the improved delayed detached-eddy simulation (IDDES) approach. The impact of computational parameters on the wake flow is examined and it is found that except for the mesh resolution, other parameters do not significantly affect the global drag forces but have significant differences in predicting the local wake flow structures.
Article
Engineering, Marine
Qi Dong, Ning Wang, Jialin Song, Lizhu Hao, Shaoman Liu, Bing Han, Kai Qu
Summary: In this paper, a math-data integrated prediction (MDIP) model is proposed for accurate motion prediction in ship maneuvering. The model combines mathematical and data-driven modules, and validates the effectiveness of order selection and math-data integration in enhancing ship motion prediction accuracy.
Article
Engineering, Marine
Tongtong Wang, Robert Skulstad, Motoyasu Kanazawa, Guoyuan Li, Houxiang Zhang
Summary: The advancement of autonomous vehicles and concerns about ship navigation safety have led to an increased demand for quality ship models. However, developing accurate models can be challenging when there is limited prior information available. To address this, we propose a knowledge transfer strategy that migrates and adapts domain knowledge from a well-modeled benchmark ship to a target ship. By incorporating informative trends into the data-driven transfer function, the representative model of the target ship can be considerably enhanced.
Article
Engineering, Ocean
Youjun Yang, Guillermo Chillcce, Ould El Moctar
Summary: An Abkowitz-type model was extended to improve the prediction of maneuvering dynamics of inland ships in deep and shallow waters. Additional hydrodynamic derivatives and higher order drift derivatives were added to better capture the hydrodynamic forces and moments. Both steady and unsteady model tests were conducted to estimate speed-dependent and acceleration-dependent hydrodynamic derivatives.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Marine
Xin Li, Yiqing Gu, Xiang Fan, Kang Zou, Xianrui Hou
Summary: This study introduces an optimization model of ship speed based on maneuvering control, applying trajectory tracking theory and sliding mode control method to simulate the control load of a ship. The accuracy and robustness of the maneuvering control model are validated in different scenarios. A particle swarm optimization algorithm is then used to determine the best speed combination. The results suggest that sailing at a constant speed is the most energy-saving strategy in still water, while adjusting speed according to sea conditions is recommended.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Shiyang Li, Tongtong Wang, Guoyuan Li, Houxiang Zhang
Summary: This paper proposes a ship maneuvering model optimization method that simplifies the model identification process by reducing the requirement on data excitation. The preliminary parameters of the ship mathematical model are identified using the least squares method, and correlation analysis is used to determine the correlation among the parameters and categorize them into groups based on their correlation. Sensitivity analysis is employed to detect the influence level of parameters and select the more critical ones. Based on the results of these analyses, a standard is established to simplify the ship maneuvering mathematical model. The experiment results verify that the simplified model outperforms the complete model when identifying with less excitation data.
Article
Engineering, Marine
Peter H. -Y. Lo
Summary: An approximate ship wake solution has been proposed and validated for accurately predicting both wake patterns and amplitudes in any water depth, reducing computational effort and removing singularities. Validation was done using 37 satellite images, a towing tank experiment, and two field experiments, with discussion on the effects of water depth on wake patterns. The new solution provides a potentially powerful tool for studying ship wake inversion by quickly relating ship shape, weight, speed, and water depth to wake characteristics.
Review
Engineering, Marine
Momchil Terziev, Tahsin Tezdogan, Atilla Incecik
Summary: This review article explores the problems with extrapolation procedures in naval architecture, the attempts to correct them and the current efforts to eliminate the need for extrapolation through full-scale Computational Fluid Dynamics. Despite progress, there are still bottlenecks in terms of data availability and computational power.
Article
Engineering, Marine
Siyao Shao, Jiaqi Li, Kyungduck Yoon, Jiarong Hong
Summary: The study investigates the gas leakage characteristics of ventilated supercavitation under various closure conditions, finding significant fluctuations in gas leakage rate across different closures and flow conditions. The results show that excessive gas leakage occurs more frequently under certain closure types and ventilation conditions, suggesting the optimal ventilation strategy for controlling supercavity stability.
Article
Astronomy & Astrophysics
C. Wang, S. P. Oh, M. Ruszkowski
Summary: There is strong evidence for subsonic turbulence in galaxy clusters, which plays a crucial role in offsetting radiative losses in the cluster cores. The turbulence in a stratified medium exhibits anisotropy due to buoyancy forces. By studying the analogy between wave-turbulence interactions and MHD turbulence, researchers have found that the cascade times and dissipation rates of turbulence decrease with the Fr number. High-resolution hydrodynamic simulations have validated this finding. The results indicate that turbulent diffusion is more severely suppressed by stratification than turbulent dissipation, leading to higher turbulent velocities required to offset cooling.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Computer Science, Interdisciplinary Applications
J. Ezequiel Martin, Ralph W. Noack, Pablo M. Carrica
JOURNAL OF COMPUTATIONAL PHYSICS
(2019)
Article
Engineering, Aerospace
Gregory M. Dooley, Austin F. Krebill, J. Ezequiel Martin, James H. J. Buchholz, Pablo M. Carrica
Article
Engineering, Civil
Marcela Politano, J. Ezequiel Martin, Troy Lyons, Kathy Dober
JOURNAL OF HYDRAULIC RESEARCH
(2020)
Article
Engineering, Marine
Dongyoung Kim, Yagin Kim, Jiajia Li, Robert Wilson, J. Ezequiel Martin, Pablo M. Carrica
JOURNAL OF SHIP RESEARCH
(2019)
Article
Computer Science, Interdisciplinary Applications
Gregory Dooley, J. Ezequiel Martin, James H. J. Buchholz, Pablo M. Carrica
COMPUTERS & FLUIDS
(2020)
Article
Engineering, Marine
Lianzhou Wang, J. Ezequiel Martin, Mario Felli, Pablo M. Carrica
Article
Engineering, Marine
Suresh Behara, Andrew Arnold, J. Ezequiel Martin, Casey M. Harwood, Pablo M. Carrica
Article
Engineering, Marine
P. M. Carrica, Y. Kim, J. E. Martin
Summary: A study on the 10/10 vertical zigzag maneuver of the generic submarine Joubert BB2 was conducted, with CFD simulations matching well with experimental data. Model scale simulations are a good surrogate for full scale for parameters related to motions, but forces are strongly affected by scale.
Article
Engineering, Aerospace
Nicholas Rober, Venanzio Cichella, J. Ezequiel Martin, Yagin Kim, Pablo Carrica
Summary: This paper addresses guidance and control of underwater vehicles by introducing a control architecture with three modules: path generation, path following, and vehicle autopilot. It provides a formulation for the path-following algorithm and derives guaranteed performance bounds, considering limits on angular rates and autopilot performance. The convergence properties are demonstrated through simulations with different vehicle models.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Engineering, Marine
Nicholas Rober, Maxwell Hammond, Venanzio Cichella, Juan E. Martin, Pablo Carrica
Summary: This paper addresses the problem of guidance and control of underwater vehicles using a multi-level control strategy. The performance bounds of the outer-loop path-following algorithm and the inner-loop L-1 adaptive control algorithm are presented. Numerical results obtained using a physics-based Simulink model aid in visualizing the control algorithm's performance.
Article
Mechanics
Mehedi H. Bappy, Pablo M. Carrica, Jiajia Li, J. Ezequiel Martin, Alberto Vela-Martin, Livia S. Freire, Gustavo C. Buscaglia
Summary: This paper presents a model for cavitation inception that takes into account the unresolved sub-grid scale (SGS) flow. By using direct numerical simulations (DNS), the pressure fluctuations, transport, and cavitating behavior in homogeneous isotropic turbulence (HIT) can be evaluated and used to create the model. The model predicts the inception pressure and cavitation rates accurately.
Article
Engineering, Marine
H. Yamashita, A. Arnold, P. M. Carrica, R. W. Noack, J. E. Martin, H. Sugiyama, C. Harwood
Summary: This study presents a methodology for simulating the transitions of amphibious vehicles between land and marine modes in the surf zone. It combines existing solvers for multibody and fluid dynamics and introduces new features for the combined solver. Controllers are implemented to simulate autonomous operations of the vehicle. The proposed approach is validated through experimental results and simulations of autonomous amphibious vehicle operations in surf zones with breaking waves.
Article
Engineering, Aerospace
Dongyoung Kim, J. Ezequiel Martin, Pablo M. Carrica
Article
Engineering, Marine
Pablo M. Carrica, Maarten Kerkvliet, Frans Quadvlieg, J. Ezequiel Martin
Summary: The study presents simulations and experiments of a generic submarine performing standard maneuvers in calm water at depth, with a focus on open dataset for benchmarking maneuvering prediction methodologies. Computational fluid dynamics predict motions and speeds well for free-sailing conditions, but replicating controller commands is challenging. Comparisons between computations and experiments show good agreement, including a crashback maneuver to stop the submarine.
JOURNAL OF SHIP RESEARCH
(2021)
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.