Offshore Structures and Hydrodynamic Modeling

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 (20 December 2023) | Viewed by 4432

Special Issue Editors


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Guest Editor
Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, UK
Interests: ship hydrodynamics; ship maneuvering; offshore renewable energy system; floating wind turbine; wave energy and control
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, UK
Interests: hydrodynamics; offshore renewable energy; floating wind turbine; wave energy converter; hydrodynamics tank testing; CFD simulation; advance measurement technologies

Special Issue Information

Dear Colleagues,

Over the past half-century, ocean engineering has witnessed its golden age. There are magnificent offshore structures being developed and built to explore offshore oil and gas. More recently, engineers and researchers have been focusing on designing offshore renewable devices to explore these oceanic resources in a sustainable way. All of these designs cannot be achieved without the development of precise numerical models of such structures under marine environments. The purpose of this Special Issue is, therefore, to promote research on offshore structure design, as well as to publish cutting-edge work on the structural and hydrodynamic modeling of offshore structures. The topic of this Special Issue will include but not be limited to:

  • novel designs of offshore structures, including oil and gas platforms, renewable energy devices, marine surface vehicles, underwater vehicles, aquaculture facilities, and very large floating structures;
  • structural analysis of the above marine structures;
  • hydrodynamic modeling of floating bodies;
  • linear and nonlinear wave loads;
  • experimental test of marine structures;
  • offshore wind turbine modeling;
  • ship hydrodynamics;
  • wave energy converters;
  • breakwater design;
  • multipurpose platforms;
  • mooring system design.

Dr. Zhiming Yuan
Dr. Saishuai Dai
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

  • offshore renewable energy system
  • floating wind turbine
  • wave energy conversion
  • offshore oil and gas production system
  • fluid–structure interaction
  • wave loads
  • mooring system

Published Papers (4 papers)

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Research

22 pages, 6090 KiB  
Article
Variable Natural Frequency Damper for Minimizing Response of Offshore Wind Turbine: Effect on Dynamic Response According to Inner Water Level
by Dong-Ju Kim, Young-Suk You and Min-Young Sun
J. Mar. Sci. Eng. 2024, 12(3), 491; https://doi.org/10.3390/jmse12030491 - 15 Mar 2024
Viewed by 538
Abstract
Offshore wind turbines (OWTs) are exposed to cyclic loads resulting from wind, waves, and rotor rotation. These loads can induce resonance, thereby significantly increasing the amplitude of the structure and accelerating the accumulation of fatigue damage. Particularly, wave loads can induce the first [...] Read more.
Offshore wind turbines (OWTs) are exposed to cyclic loads resulting from wind, waves, and rotor rotation. These loads can induce resonance, thereby significantly increasing the amplitude of the structure and accelerating the accumulation of fatigue damage. Particularly, wave loads can induce the first mode of large turbines. While many studies have been conducted to suppress OWT vibrations due to external loads, research on variable natural frequency damper (VNFD), which control vibrations through changes in the natural frequency by adjusting the inner water level of the structure, is still in its infancy. Herein, the performance of a VNFD in controlling the vibration of monopile-type OWTs is analyzed by focusing on cyclic environmental loads. To analyze the amplitude minimization achieved using a VNFD, wave loads with the same period as that of the structure’s natural frequency were generated, and the structural response resulting from changes in the inner water level were analyzed. As a result, the peak displacement at the top of the tower decreased by 5.8% and 34% at the water depths of 20 m and 50 m, respectively. In terms of the peak intensity determined through Fast Fourier Transform of the displacement response, reductions of 33% and 65% were confirmed at the depths of 20 m and 50 m, respectively. Full article
(This article belongs to the Special Issue Offshore Structures and Hydrodynamic Modeling)
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20 pages, 3906 KiB  
Article
Analysis of the Wave Attenuating and Dynamic Behaviour of a Floating Breakwater Integrating a Hydro-Pneumatic Energy Storage System
by Charise Cutajar, Tonio Sant, Robert N. Farrugia and Daniel Buhagiar
J. Mar. Sci. Eng. 2023, 11(11), 2189; https://doi.org/10.3390/jmse11112189 - 17 Nov 2023
Cited by 2 | Viewed by 808
Abstract
Floating breakwaters have recently been generating increasing interest as a vital means to provide shelter and protect the ever-increasing number of structures deployed at sea. Notwithstanding the novel ideas being put forward, to date, floating breakwater deployment has been limited to inshore and [...] Read more.
Floating breakwaters have recently been generating increasing interest as a vital means to provide shelter and protect the ever-increasing number of structures deployed at sea. Notwithstanding the novel ideas being put forward, to date, floating breakwater deployment has been limited to inshore and shallow water areas. The scale of such structures has been restricted to the smaller spectrum. Furthermore, whilst some concepts to integrate floating breakwaters with other offshore systems have been proposed to benefit from cost-sharing strategies, studies related to floating breakwaters integrating energy storage are lacking in the open literature. The present research investigates the wave attenuating and dynamic performance of a large-scale floating breakwater in deep seas with a hydro-pneumatic energy storage system also integrated within the structure. This article highlights the arising need for floating breakwaters and sheds light on the present-day technological status of floating wave breakers. It then lays the ground for the proposed, novel floating breakwater concept that aims to address the current knowledge gaps in this field of study. The simulation results generated from numerical modelling via the potential flow solver ANSYS® AQWA™ have been promising, connoting that the addition of hydro-pneumatic energy storage to a floating breakwater will not lead to a degradation in the dynamic performance or wave breaking efficiency of the floating structure. Full article
(This article belongs to the Special Issue Offshore Structures and Hydrodynamic Modeling)
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26 pages, 13544 KiB  
Article
Hydrodynamic Loads on a Group of Six Structures of Different Cross-Sections in Uniform and Sheared Flow
by Henry Francis Annapeh and Victoria Kurushina
J. Mar. Sci. Eng. 2023, 11(2), 383; https://doi.org/10.3390/jmse11020383 - 09 Feb 2023
Cited by 1 | Viewed by 1070
Abstract
The estimates of hydrodynamic forces for a group of structures represent a challenge for the design of offshore systems, as they are subject to changes with a variation in flow profiles. The fluctuating effects may be more pronounced or, on the contrary, suppressed [...] Read more.
The estimates of hydrodynamic forces for a group of structures represent a challenge for the design of offshore systems, as they are subject to changes with a variation in flow profiles. The fluctuating effects may be more pronounced or, on the contrary, suppressed if the cross-sectional shape of structures in an array is altered. The present work performs a series of 2D numerical simulations for the flow past six identical stationary cylinders of three distinct geometrical shapes arranged in a 2 × 3 matrix configuration. The flow profiles considered have an averaged velocity corresponding to the critical flow regime of a Reynolds number of 2.5 × 105. The detached eddy simulation k–ω SST turbulence model is employed to perform a comprehensive investigation of the fluid force coefficients, their frequencies and vortex formation patterns. The effect of the spacing ratio varied simultaneously among the structures from 2 to 7 is considered in conjunction with the change in the flow profile and the cylinders’ cross-section. The results of simulations show a higher mean drag on the upstream cylinders, reduced mean drag on the mid- and downstream cylinders with the second cross-sectional shape, and a higher mean drag on the cylinders with the third cross-sectional shape, compared to the original circular cylinders. Full article
(This article belongs to the Special Issue Offshore Structures and Hydrodynamic Modeling)
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19 pages, 5015 KiB  
Article
Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario
by Yan Li, Yaolong Li, Zhimin Zhao, Yougang Tang, Haoran Li, Yijian Zhang and Yinan Hu
J. Mar. Sci. Eng. 2023, 11(1), 218; https://doi.org/10.3390/jmse11010218 - 14 Jan 2023
Cited by 1 | Viewed by 1245
Abstract
At present, dry wellheads are usually adopted on small-storage TLP and SPAR platforms to develop offshore oil and gas because of the robust hydrodynamic performance under severe-wind seas. On the other hand, FPSO and FDPSO platforms that have a larger storage capacity can [...] Read more.
At present, dry wellheads are usually adopted on small-storage TLP and SPAR platforms to develop offshore oil and gas because of the robust hydrodynamic performance under severe-wind seas. On the other hand, FPSO and FDPSO platforms that have a larger storage capacity can hardly use this cost-saving facility due to their relatively poor vertical motion performance. Cylindrical FPSOs are proposed to improve the heave performance of ship-type FPSOs, but their behaviors are still too large to adopt the dry wellheads. In the present work, a cylindrical FDPSO platform is proposed based on the FWPSO platform, adding an extension cylinder and a new damping structure at the bottom. Their hydrodynamic performances are calculated by the potential theory and compared in the frequency domain. Taking two particular mooring systems, including both catenary and ‘chain-polyester-chain’ types, and the survival sea scenario in the South China Sea into account, a time-domain coupling analysis was adopted to simulate the dynamic performance of the platform-mooring system. The feasibility of dry wellhead adoption on the FDPSO is discussed by investigating the platform motion and the mooring tension. The results show that the FCDS platform with the ‘chain-polyester-chain’-type mooring system can meet the motion response requirements, and the mooring system can also meet the requirements of the specification. Full article
(This article belongs to the Special Issue Offshore Structures and Hydrodynamic Modeling)
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