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Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures
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Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures

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: closed (31 January 2023) | Viewed by 7554

Special Issue Editor

Dr. Rodolfo T. Gonçalves

E-Mail Website
Guest Editor
School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
Interests: fluid-structure interaction (FSI); floating offshore wind turbine (FOWT); flow-induced motions (FIM); offshore platforms; hydrodynamics; model tests
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue presents the latest achievements in developing theoretical and experimental studies, physical models and computational methods, modeling developments, etc., in hydrodynamic and fluid–structure interaction research and its applications on floating offshore structures. Among the floating offshore structure topics, we can cite:

  • New developments for clean wind energy exploration, such as floating offshore wind turbines (FOWT); 
  • Floating structures applied for energy harvesting using different environmental issue sources (wave, currents, tides, etc.);
  • Oil and gas exploration as floating production storage and offloading (FPSO), semi-submersibles (SS), tension-leg platforms (TLP), monocolumn platforms, etc.; 
  • Mega float units (airports, fisherman farms, floating cities, etc.); and
  • Developments and designs of new floating offshore structures are very welcome. 

This issue aims to help the designers of floating offshore structures to optimize and/or choose the best options for further engineering development phases of these systems, not only the construction, but also installation, operation and decommissioning.

Dr. Rodolfo Trentin Gonçalves
Guest Editor

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

  • hydrodynamics
  • fluid-structure interaction
  • floating offshore structures
  • model tests
  • numerical simulations
  • waves
  • currents
  • wind
  • energy harvesting

Published Papers (4 papers)

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Research

13 pages, 6072 KiB  
Article
Research on Structural Response Characteristics of Trapezoidal Floating Body in Waves
by Xuemin Song, Weiqin Liu and Guowei Zhang
J. Mar. Sci. Eng. 2022, 10(11), 1756; https://doi.org/10.3390/jmse10111756 - 15 Nov 2022
Cited by 1 | Viewed by 1400
Abstract
Floating structures plays an important role in extending and developing ocean resources, and their response evaluation is a hot topic of global important research due to the large dimensions. With characteristics including small depth and large horizontal plane, it is easy to induce [...] Read more.
Floating structures plays an important role in extending and developing ocean resources, and their response evaluation is a hot topic of global important research due to the large dimensions. With characteristics including small depth and large horizontal plane, it is easy to induce the hydro-elastic resonant responses due to total stiffness. In this paper, first, the model design is performed to satisfy hydro-elastic similarity. Then, the model test is carried out in a wave tank to measure the structural response of a trapezoidal floating body in a series of waves. Secondly, the 3D hydro-elastic computational platform HOMER is applied to calculate the stress response of a trapezoidal floating body in numerical waves. The model test results and numerical simulation results are analyzed and compared and the conclusions are drawn, which indicate that a numerical method is effective to predict the structural response characteristics of a trapezoidal floating body. Above all, it is found that the significant response of a floating model is generated in some cases. The methods and conclusions of this study are used to provide reference and guidance for structural design of a trapezoidal floating body. Full article
(This article belongs to the Special Issue Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures)
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16 pages, 4699 KiB  
Article
Dynamic Motions of Piled Floating Pontoons Due to Boat Wake and Their Impact on Postural Stability and Safety
by Elizabeth L. Freeman, Kristen D. Splinter, Ron J. Cox and Francois Flocard
J. Mar. Sci. Eng. 2022, 10(11), 1633; https://doi.org/10.3390/jmse10111633 - 2 Nov 2022
Viewed by 2450
Abstract
Piled floating pontoons are public access structures that provide a link between land and sea. Despite floating pontoons being frequented by the public, there is limited data available to coastal or maritime engineers detailing the dynamic motions (acceleration and rotation) of these structures [...] Read more.
Piled floating pontoons are public access structures that provide a link between land and sea. Despite floating pontoons being frequented by the public, there is limited data available to coastal or maritime engineers detailing the dynamic motions (acceleration and rotation) of these structures under wave action and the impact of these motions on public comfort and safety to inform their design. This contribution summarises results from a set of laboratory-scale physical model experiments of two varying beam width piled floating pontoons subjected to boat wake conditions. Observed accelerations and roll angles were dependent on beam-to-wavelength ratio (B/L), with the most adverse motion response observed for B/L ~0.5. Internal mass of the pontoon played a secondary role, with larger mass structures experiencing lower accelerations for similar B/L ratios. Importantly, these new experimental results reveal the complex interaction between the piles and pontoon that result in peak accelerations more than six times the nominated operational safe motion limit of 0.1g. Root mean square (RMS) accelerations were more than three times the nominated comfort limit (0.02g) and angles of rotation more than double what would be perceived as safe (6 degrees) for the boat wake conditions tested. The frequency of acceleration also suggests patrons standing on these platforms are likely to experience discomfort and instability. Laboratory results are compared against a series of field-scale experiments of pontoon motion response and patron feedback. The dynamic motion response of pontoons tested in both field-scale and laboratory experiments compared well. Full article
(This article belongs to the Special Issue Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures)
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25 pages, 5790 KiB  
Article
Study on Elastic Response of Double-Rotor VAWTs
by Saika Iwamatsu, Hideyuki Suzuki and Yasunori Nihei
J. Mar. Sci. Eng. 2022, 10(10), 1400; https://doi.org/10.3390/jmse10101400 - 30 Sep 2022
Cited by 1 | Viewed by 1463
Abstract
This study investigates the elastic response characteristics of a floating wind turbine (FOWT) with two vertical-axis wind turbines (VAWTs), called double-rotor VAWTs. The model consists of two VAWTs mounted on a single semi-submersible floating structure and employs a single point mooring, which allows [...] Read more.
This study investigates the elastic response characteristics of a floating wind turbine (FOWT) with two vertical-axis wind turbines (VAWTs), called double-rotor VAWTs. The model consists of two VAWTs mounted on a single semi-submersible floating structure and employs a single point mooring, which allows the FOWT to always self-align with the wind. Usually, a coupled analysis of the wind turbine and floating structure is used in the design of FOWTs; however, there is no coupled analysis available for VAWTs. In this study, we attempted to combine the wind turbine design software “QBlade” and the coupled wind turbine/floating body analysis code “UTWind” as one of the methods of coupled analysis of a VAWT and a floating body. Numerical simulation results were compared with experimental results using an elastic model scaled down to 1/100 of its actual model to determine the motion response and cross-sectional bending moments. The experimental results showed that the thrust of the VAWT had a particular influence on the cross-sectional forces and motion response between the two VAWTs. For cross-sectional forces, all results showed similar trends. Overall, the results of UTWind for double-rotor VAWTs are reasonable. It was also found that the pitch motion must be accurately reproduced to improve the accuracy. Full article
(This article belongs to the Special Issue Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures)
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23 pages, 9614 KiB  
Article
Wave Response of a Monocolumn Platform with a Skirt Using CFD and Experimental Approaches
by Masaki Katafuchi, Hideyuki Suzuki, Yuya Higuchi, Hidetaka Houtani, Edgard B. Malta and Rodolfo T. Gonçalves
J. Mar. Sci. Eng. 2022, 10(9), 1276; https://doi.org/10.3390/jmse10091276 - 9 Sep 2022
Cited by 3 | Viewed by 1477
Abstract
This paper aims to investigate the nonlinear motion characteristics of a monocolumn type floater with skirts numerically and experimentally. Wave calibration, free decay, and regular wave tests were simulated using a computational fluid dynamics (CFD) code OpenFOAM. The experiments were carried out in [...] Read more.
This paper aims to investigate the nonlinear motion characteristics of a monocolumn type floater with skirts numerically and experimentally. Wave calibration, free decay, and regular wave tests were simulated using a computational fluid dynamics (CFD) code OpenFOAM. The experiments were carried out in a wave tank to validate the CFD results. First, wave calibration tests were performed to investigate wave generation, development, propagation, and absorption in the numerical wave tank. Second, the simulation input parameters were calibrated to reproduce the waves generated in the tank experiment. Third, free decay tests of heave and pitch were conducted to examine the natural period and the linear and quadratic damping of the floater. A verification and validation study was performed using experimental data for free decay tests. Finally, regular wave tests were performed to investigate the motion characteristics of the floater. The results were processed to obtain the response amplitude operator (RAO) for the heave and pitch motions. The RAOs of the floater was compared with the experimental data and numerical simulations based on the linear potential theory code WAMIT to investigate the performance of the CFD simulations. The comparisons made in this work showed the potential of the CFD method to reproduce the motion characteristics of a shallow-draft floating object with a skirt in waves and to visualize the nonlinear phenomena behind the oscillation of the floating object. Full article
(This article belongs to the Special Issue Advances in Hydrodynamics and Fluid-Structure Interactions of Floating Offshore Structures)
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