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Dynamic Stability and Safety of Ships in Waves
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Dynamic Stability and Safety of Ships in Waves

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: 30 May 2024 | Viewed by 4037

Special Issue Editors

Prof. Dr. Se-Min Jeong

E-Mail Website
Guest Editor
Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 61452, Republic of Korea
Interests: computational physics; fluid–structure-motion interaction; free-surface flows; multiphase thermal flows; ocean model
Prof. Dr. Sunho Park

E-Mail Website
Guest Editor
Department of Ocean Engineering, Korea Maritime and Ocean University, Busan 727, Republic of Korea
Interests: computational physics; fluid–structure-motion interaction; ice-sea interaction; ship motions in waves; extreme waves

Special Issue Information

Dear Colleagues,

The motion of floating bodies in waves is one of the most characteristic research areas in the field of naval and ocean engineering. Seakeeping performance is a crucial aspect, not only for conventional vessels like cargo ships, but also for high-speed crafts such as patrol boats and naval ships, and offshore structures. It plays a significant role in ensuring the efficiency and safety of these vessels and marine systems during operations at sea. The development of autonomous navigation technologies and the increasing demand for eco-friendly energy carriers have made it imperative to understand and optimize the seakeeping performance of vessels engaged in the transport of LNG and liquid hydrogen. This Special Issue aims to gather cutting-edge scientific papers on ship stability and safety, focusing on wave-induced motions and effects.

Prof. Dr. Se-Min Jeong
Prof. Dr. Sunho Park
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ship dynamics
  • seakeeping performance
  • wave-induced motion
  • wave load reduction
  • safety in rough sea
  • risk analysis
  • regulations and standards
  • autonomous ship

Published Papers (4 papers)

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Research

15 pages, 16466 KiB  
Article
Effect of Wavelength on Turbine Performances and Vortical Wake Flows for Various Submersion Depths
by Bohan Liu and Sunho Park
J. Mar. Sci. Eng. 2024, 12(4), 560; https://doi.org/10.3390/jmse12040560 - 27 Mar 2024
Viewed by 705
Abstract
When tidal turbines are deployed in water areas with significant waves, assessing the surface wave effects becomes imperative. Understanding the dynamic impact of wave–current conditions on the fluid dynamic performance of tidal turbines is crucial. This paper aims to establish a fundamental understanding [...] Read more.
When tidal turbines are deployed in water areas with significant waves, assessing the surface wave effects becomes imperative. Understanding the dynamic impact of wave–current conditions on the fluid dynamic performance of tidal turbines is crucial. This paper aims to establish a fundamental understanding of the influence of surface waves on tidal turbines. OpenFOAM, an open-source computational fluid dynamics (CFD) library platform, is utilized to predict the performance of current turbine under waves and currents. This research investigates the effects of two critical wave parameters, wave height and wavelength, on the fluid dynamics and wake structures of current turbine. Additionally, this study explores the influence of various submersion depths on turbine performance. The findings indicate that, under various wave conditions, the turbine’s average power coefficient remains constant, but significant fluctuations are shown. Increasing submersion depth can mitigate the impact of waves. However, in regions characterized by longer wavelengths, altering the submersion depth has limited effects on turbine performance. Full article
(This article belongs to the Special Issue Dynamic Stability and Safety of Ships in Waves)
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17 pages, 6455 KiB  
Article
Numerical Simulation of Seakeeping Performance of a Barge Using Computational Fluid Dynamics (CFD)-Modified Potential (CMP) Model
by Seol Nam, Jong-Chun Park, Jun-Bum Park and Hyeon Kyu Yoon
J. Mar. Sci. Eng. 2024, 12(3), 369; https://doi.org/10.3390/jmse12030369 - 21 Feb 2024
Viewed by 712
Abstract
This paper explains the evaluation process of seakeeping performance for small vessels using a CFD-modified potential (CMP) model, a hybrid simulation model that modifies the damping ratio with computational fluid dynamics (CFD) after analyzing ship motion based on the linear potential theory. From [...] Read more.
This paper explains the evaluation process of seakeeping performance for small vessels using a CFD-modified potential (CMP) model, a hybrid simulation model that modifies the damping ratio with computational fluid dynamics (CFD) after analyzing ship motion based on the linear potential theory. From the result of the motion analysis using the CMP model, the seakeeping performance of a small vessel (a barge here) was evaluated on the basis of the single significant amplitude (SSA) under the sea states 2~4. The results of the motion RAOs and seakeeping performance evaluation were verified through comparison with the results obtained by performing model tests and potential flow programs only. In all sea states, the relative errors (compared to the experiment) of roll motion using the CMP model were relatively small compared to the results using the potential flow program and tended to decrease more as the sea state increased. On the other hand, the results of pitch motion using the CMP model were underestimated in all sea states compared to the experiment. However, it is seen that they are relatively closer to the experiment compared to the results using a potential flow program only. Full article
(This article belongs to the Special Issue Dynamic Stability and Safety of Ships in Waves)
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22 pages, 10420 KiB  
Article
A Comparative Analysis of CFD and the Potential Flow Method for the Pure Loss of Stability in Following Waves
by Ke Zeng, Jiang Lu, Min Gu and Chen Yang
J. Mar. Sci. Eng. 2023, 11(11), 2135; https://doi.org/10.3390/jmse11112135 - 08 Nov 2023
Cited by 1 | Viewed by 1080
Abstract
Improving the cognition and numerical accuracy of stability failure is urgent for carrying forward the direct assessment stability of the new-generation performance-based criteria for intact stability issued by the International Maritime Organization (IMO) in 2020. Firstly, the CFD method utilizing commercial software is [...] Read more.
Improving the cognition and numerical accuracy of stability failure is urgent for carrying forward the direct assessment stability of the new-generation performance-based criteria for intact stability issued by the International Maritime Organization (IMO) in 2020. Firstly, the CFD method utilizing commercial software is developed for predicting stability failure in following seas. The CFD method employed overlapping grid techniques to achieve coupled motion calculations with a free-running model. The actual propeller rate, the implemented auto polite course-keeping, the coupled effect of the ship hull–propeller–rudder, and the instantaneous wet hull are considered in the CFD method. Secondly, a comprehensive 6-DOF mathematical model, employing the MMG framework and potential flow theory, is utilized to predict stability failure in the following waves. The radiation and diffraction forces are calculated around the mean wet hull using an enhanced strip method, and the FK and hydrostatic forces are calculated around the exact wet hull in waves. Thirdly, the occurrence of pure stability loss and subsequent large roll motions or capsizing for the ONR tumblehome ship are simulated by the time domain CFD and potential flow method. Finally, the computed results are cross-referenced with the available experimental data, and the trends of maximum roll angle are found to be consistent with the test data. Additionally, the alterations in thrust and torque exerted by the twin rudders and propellers are assessed across various sailing speeds, as well as the characteristics of the flow field distribution around the hull and appendages during capsizing at the critical sailing speed, which are newly analyzed by the CFD method. Full article
(This article belongs to the Special Issue Dynamic Stability and Safety of Ships in Waves)
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25 pages, 17010 KiB  
Article
Investigation of Low-Frequency Pitch Motion Characteristics for KRISO Standard Offshore Structure (K-Semi) Moored with a Truncation Mooring System
by Byeongwon Park, Sungjun Jung, Min-Guk Seo, Jinha Kim, Hong Gun Sung and Jong-Chun Park
J. Mar. Sci. Eng. 2023, 11(10), 1842; https://doi.org/10.3390/jmse11101842 - 22 Sep 2023
Viewed by 899
Abstract
In this study, a model test was carried out to evaluate the station-keeping performance of Korea Research Institute of the Ships and Ocean Engineering (KRISO) standard semi-submersible, K-Semi in the Deep Ocean Engineering Basin (DOEB). The test was performed using a 1/50 scaled [...] Read more.
In this study, a model test was carried out to evaluate the station-keeping performance of Korea Research Institute of the Ships and Ocean Engineering (KRISO) standard semi-submersible, K-Semi in the Deep Ocean Engineering Basin (DOEB). The test was performed using a 1/50 scaled model with 12 mooring lines. The water depth was set to 3.2 m using a moveable bottom structure and truncated mooring lines. The dynamic behavior of the K-Semi was examined using a free decay test and regular wave as well as irregular wave tests of 1800. Large surge, heave and pitch due to drift motion from second-order effect were observed. The reason for the excessive low-frequency pitch motion is attributed to the restoring force and moment related to the mooring system as excessive surge occurred. The numerical model of K-Semi with the truncated mooring system was tuned and calibrated using model test results such as free decay and regular wave tests. Through numerical analysis, the motion characteristics of the K-Semi were compared with irregular model test results. In the case of a semi-submersible using a mooring system, it is observed that excessive pitch motion due to vertical restoring force and moment may occur when large horizontal displacement occurs. The effect of low-frequency pitch motion related to surge motion is an important factor in upwell estimation as well as second-order motion in referred DNV-GL OTG13. Full article
(This article belongs to the Special Issue Dynamic Stability and Safety of Ships in Waves)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Determination of wave damper efficiency using CFD
Authors: Šimun Sviličić; Smiljko Rudana
Affiliation: Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 100000 Zagreb, Croatia
Abstract: The action of wind-induced waves can result in a partial or complete wash-over of the beach, and the erosion affects both landscape and tourism infrastructure. In some regions of the world, e.g. Croatia, this process, normally occurring during the harsh wintertime, has a big environmental and economic impact, and prevention or reduction of the process is highly desirable. One of the simplest ways to reduce or stop beach erosion is the use of innovative underwater structures that have the goal of reducing wave energy by reducing wave height. In this research, structures known as wave dampers are numerically investigated considering different topologies, positions, and orientations concerning the free surface. Not only optimal topology is determined, but also the interaction between them. The advantage of newly developed wave dampers over traditional wave dampers (rock solid piers) is that they do not require complex construction, massive foundations, and high investment costs but instead, they are comprised of simple floating bodies connected to the seabed by mooring lines. With this design, they are not only cheap, adaptable, and easy to install but they are also eco-friendly as they have little influence on the seabed and environment. The research consists of the parametric analysis of wave damper efficiency, finding the best arrangement of multiple wave dampers including the analysis of different mooring systems to overall system efficiency. To acquire these results, the incompressible computational fluid dynamics (ICFD) method will be used which enables the use of a turbulence model as well as the possibility of accurate wave modelling.

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