Computational Fluid Dynamics in Marine Environments

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

Deadline for manuscript submissions: closed (1 August 2023) | Viewed by 7478

Special Issue Editors


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Guest Editor
1. School of Ocean Engineering and Technology, Sun Yat-sen University, Zhuhai 519000, China
2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
Interests: CFD simulation and experimental testing of complex flow fields; towing tank test; ship propulsion and energy saving

E-Mail Website
Guest Editor
1. School of Ocean Engineering and Technology, Sun Yat-sen University, Zhuhai 519000, China
2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
Interests: fluid–structure interaction; smooth particle hydrodynamics (SPH)
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Special Issue Information

Dear Colleagues,

In marine environments, surface and internal waves, wind, currents, and sea ice occur, and these are some of the most important sources of dynamic load on marine structures. An understanding of marine environments and their interactions with structures, the seabed, and ocean-land boundaries is of great importance in both fundamental research and engineering applications. Computational fluid dynamics techniques, which are undergoing rapid development due to advances in computer science and numerical methods, can accurately and efficiently predict fluid dynamics and the complex interactions between marine environments and ocean structures. With the improvement and development of new numerical models for the simulation of marine environments (such as mesh-based and meshless numerical models and high-performance parallel computing), advanced applications of numerical methods for simulating complex marine environments, including wind, waves, currents, and sea ice, are key issues that need to be further addressed. We welcome high-quality research papers and reviews of recent developments in computational fluid dynamics in marine environments.

This Special Issue of Marine Science and Engineering, entitled "Computational Fluid Dynamics in Marine Environments", aims to collect contributions that present novel numerical models and methods (e.g., numerical algorithms, problem-solving procedures, and parallel acceleration techniques) and that utilize computational fluid dynamics methods in fields related to the marine environment.

Topics include, but are not limited to:

  • The development and validation of new numerical methods;
  • Numerical studies on the main processes in waves, wind, currents, and sea ice, and particularly their complex coupled interactions with each other;
  • Numerical studies on the interactions of marine environments with structures, the seabed, and ocean-land boundaries;
  • Numerical simulations using high-performance computing for ocean environments;
  • Numerical benchmark studies with experimental validations;
  • The development of numerical models and applications for ocean, offshore, and arctic engineering applications.

Dr. Tiecheng Wu
Dr. Peng-Nan Sun
Guest Editors

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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.

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Keywords

  • computational fluid dynamics
  • mesh-based methods
  • mesh-free methods
  • particle methods
  • water waves
  • current
  • wind
  • sea ice
  • parallel computing
  • fluid mechanics
  • fluid–structure interaction

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Published Papers (4 papers)

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Research

18 pages, 2467 KiB  
Article
Numerical Simulations of Tank Sloshing Problems Based on Moving Pseudo-Boundary Method of Fundamental Solution
by Chengyan Wang, Yuanting Zou, Ji Huang and Chia-Ming Fan
J. Mar. Sci. Eng. 2023, 11(7), 1448; https://doi.org/10.3390/jmse11071448 - 19 Jul 2023
Cited by 1 | Viewed by 1682
Abstract
The moving pseudo-boundary method of fundamental solutions (MFS) was employed to solve the Laplace equation, which describes the potential flow in a two-dimensional (2D) numerical wave tank. The MFS is known for its ease of programming and the advantage of its high precision. [...] Read more.
The moving pseudo-boundary method of fundamental solutions (MFS) was employed to solve the Laplace equation, which describes the potential flow in a two-dimensional (2D) numerical wave tank. The MFS is known for its ease of programming and the advantage of its high precision. The solution of the boundary value can be expressed by a linear combination of the fundamental solutions. The major issue with such an implementation is the optimal distribution of source nodes in the pseudo-boundary. Traditionally, the positions of the source nodes are assumed to be fixed to keep the set of equations closed. However, in the moving boundary problem, the distribution of source nodes may influence the stability of numerical calculations. Moreover, MFS is unstable in time iterations. Hence, it is necessary to constantly revise the weighting coefficients of fundamental solutions. In this study, the source nodes were free, and their locations were determined by solving a nonlinear least-squares problem using the Levenberg–Marquardt algorithm. To solve the above least-squares problem, the MATLAB© routine lsqnonlin was adopted. Additionally, the weighting coefficients of fundamental solutions were solved as a nonlinear least-squares problem using the aforementioned method. The numerical results indicated that the numerical simulation method adopted in this paper is accurate and reliable in solving the problem of 2D tank sloshing. The main contribution of this study is to expand the application of the MFS in engineering by integrating it with the optimal configuration problem of pseudo-boundaries to solve practical engineering problems. Full article
(This article belongs to the Special Issue Computational Fluid Dynamics in Marine Environments)
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19 pages, 14050 KiB  
Article
Numerical Investigation of Vortex-Induced Vibrations of a Rotating Cylinder near a Plane Wall
by Ran Li, Jie Gong, Wei Chen, Jie Li, Wei Chai, Chang-kyu Rheem and Xiaobin Li
J. Mar. Sci. Eng. 2023, 11(6), 1202; https://doi.org/10.3390/jmse11061202 - 9 Jun 2023
Cited by 5 | Viewed by 1631
Abstract
Numerical simulations are carried out to investigate the vortex-induced vibrations of a two-degree-of-freedom (2DOF) near-wall rotating cylinder. Considering the effects of gap ratio, reduced velocity and rotational rate, the amplitude response, wake variations and fluid forces are analyzed, with the Reynolds number of [...] Read more.
Numerical simulations are carried out to investigate the vortex-induced vibrations of a two-degree-of-freedom (2DOF) near-wall rotating cylinder. Considering the effects of gap ratio, reduced velocity and rotational rate, the amplitude response, wake variations and fluid forces are analyzed, with the Reynolds number of 200 and the mass ratio set to 1.6. The correlative mechanism in the wake–hydrodynamics–vibration is revealed. The results show that the influence of the wall dominates the vortex-induced vibration of the cylinder. The effect of the wall on the vibration weakens as the gap ratio increases, and the effect of the wall on the vibration is negligible when H/D > 1.1. The forward rotation of the cylinder enhances the wall effect, while the backward rotation presents the reverse effect. The vortex-induced vibration of the cylinder is suppressed when 0 < α < 1, and the amplitude range is concentrated at Vr ∈ (3, 5). The wake mode can be divided into five modes, and the wake modes are clarified under different rotation rates and reduced velocities. Full article
(This article belongs to the Special Issue Computational Fluid Dynamics in Marine Environments)
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25 pages, 17389 KiB  
Article
Investigation of Vortex-Induced Vibration of Double-Deck Truss Girder with Aerodynamic Mitigation Measures
by Gang Yao, Yuxiao Chen, Yang Yang, Yuanlin Zheng, Hongbo Du and Linjun Wu
J. Mar. Sci. Eng. 2023, 11(6), 1118; https://doi.org/10.3390/jmse11061118 - 25 May 2023
Cited by 6 | Viewed by 1704
Abstract
The long-span double-deck truss girder bridge has become a recommend structural form because of its good performance on traffic capacity. However, the vortex-induced vibration (VIV) characteristics for double-deck truss girders are more complicated and there is a lack of related research. In this [...] Read more.
The long-span double-deck truss girder bridge has become a recommend structural form because of its good performance on traffic capacity. However, the vortex-induced vibration (VIV) characteristics for double-deck truss girders are more complicated and there is a lack of related research. In this research, wind tunnel tests were utilized to investigate the VIV characteristics of a large-span double-deck truss girder bridge. Meanwhile, the VIV suppression effect of the aerodynamic mitigation measures was measured. Furthermore, the VIV suppression mechanism was studied from the perspective of vortex shedding characteristics. The results indicated that the double-deck truss girder had a significant VIV when the wind attack angles were +3° and +5°. The aerodynamic mitigation measures had an influence on the VIV response of the double-deck truss girder. The upper chord fairing and lower chord inverted L-shaped deflector plate played a crucial role in suppressing VIV. Numerical analysis indicated that vortex shedding above the upper deck or in the wake region may dominate vertical VIV, while vortex shedding in the wake region of the lower deck may dominate torsional VIV. The upper chord fairing and lower chord inverted L-shaped deflector plate disrupted the original vortex shedding pattern in both regions, thereby suppressing VIV. This research can provide a foundation for bridge design and vibration suppression measures for large-span double-deck truss girder bridges. Full article
(This article belongs to the Special Issue Computational Fluid Dynamics in Marine Environments)
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15 pages, 6395 KiB  
Article
Numerical Analysis of Propeller Wake Evolution under Different Advance Coefficients
by Duo Yu, Yu Zhao, Mei Li, Haitian Liu, Suoxian Yang and Liang Wang
J. Mar. Sci. Eng. 2023, 11(5), 921; https://doi.org/10.3390/jmse11050921 - 26 Apr 2023
Viewed by 1921
Abstract
Propeller wake fields in an open-water configuration were compared between two loading circumstances using large-eddy simulation (LES) with a computational domain of 48 million grids and an overset mesh technique. To validate the results of the numerical simulation, available experimental data are compared, [...] Read more.
Propeller wake fields in an open-water configuration were compared between two loading circumstances using large-eddy simulation (LES) with a computational domain of 48 million grids and an overset mesh technique. To validate the results of the numerical simulation, available experimental data are compared, which indicates that the grid systems are suitable for the present study. The results indicate that the present LES simulations describe the inertial frequency range well for both high and low-loading conditions. Under high-loading conditions, the interlaced spirals and secondary vortices that connect adjacent tip vortices amplify the effects of mutual inductance, ultimately triggering the breakdown of the propeller wake systems. At a great distance from the propeller, the vortex system loses all coherence and turns into a collection of smaller vortices that are equally scattered across the wake. In contrast, under light-loading conditions, the wake vortex system exhibits strong coherence and has a relatively simple topology. The elliptic instability and pairing processes are only observed at a far distance from the propeller. The convection velocity transferring tip vortices downstream is larger under the light-loading condition, which leads to the larger pitch of the helicoidal vortices. The larger pitch weakens the mutual inductance or interaction effects among tip vortices, which delays the instability behaviors of the whole vortex system. The results and implications of this study serve as a guide for the development and improvement of next-generation propellers that function optimally when operating behind aquaculture vessels. Full article
(This article belongs to the Special Issue Computational Fluid Dynamics in Marine Environments)
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