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Hydroelastic Behaviour of Floating Offshore Structures
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Hydroelastic Behaviour 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 (20 November 2024) | Viewed by 13715

Special Issue Editors

Dr. Sarat Chandra Mohapatra

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Guest Editor
Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Interests: hydroelasticity; marine dynamics and hydrodynamics; wave–current interaction; offshore floating and submerged flexible structures
Special Issues, Collections and Topics in MDPI journals
Dr. Carlos Guedes Soares

E-Mail Website
Guest Editor
Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Interests: marine environment; ship dynamics; marine structures; safety and reliability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are inviting submissions to the Special Issue ‘Hydroelastic Behavior of Floating Offshore Structures. This Special Issue is navigated by the increase in the use of floating offshore structures for various applications, such as large floating platforms, the floating base for aquaculture, and large-capacity oil storage tanks. Therefore, the hydroelastic behaviour of floating offshore structures in terms of their vertical displacement and structural deformations of n-modes are necessary to access their efficiency and survivability from structural damages as the offshore floating structure is located in unprotected open waters and exposed to rigorous environmental conditions.

This Special Issue will focus especially on models based on the novel, latest, and allied developments in floating offshore structures in the area of hydroelasticity. Submissions will be addressed by theoretical modeling, numerical modeling, and prototype testing as applications in offshore base.

Contributions introducing the non-linear wave effect on the hydroelastic response of floating structures based on theoretical, numerical, and experimental models are particularly welcome.

Taking into consideration the above-mentioned features, this Special Issue will include, without being limited to, the following topics of interest:

  • Theoretical model for floating oil-storage tank;
  • Floating structure with hinges plates;
  • Analytical and numerical model;
  • Hydroelastic behavior of floating fish cage;
  • Nonlinear hydroelastic model;
  • Hydroelastic of the offshore wide turbine;
  • Model tests of floating pontoon.

Dr. Sarat Chandra Mohapatra
Dr. Carlos Guedes Soares
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

  • hydroelastic of moored structures
  • circular floating structure
  • oil-storage tank
  • mooring lines with hinges
  • offshore wind turbine
  • elastic floaters with fish cage
  • floating platform

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Published Papers (8 papers)

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Research

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21 pages, 7267 KiB  
Article
Numerical Study on Hydroelastic Responses of Submersible High-Density Polyethylene Circular Seaweed Platforms Held by Single-Point Mooring System and Buoys
by Huu-Phu Nguyen, Chenxuan Huang, Brian von Herzen and Chien-Ming Wang
J. Mar. Sci. Eng. 2024, 12(8), 1437; https://doi.org/10.3390/jmse12081437 - 20 Aug 2024
Viewed by 619
Abstract
This paper investigates the hydroelastic behavior of submersible circular seaweed platforms under wave action. The circular platform comprises circular collars constructed from high-density polyethylene (HDPE) pipes and seaweed grow-out lines arranged in the radial direction. The HDPE pipes may be filled with air, [...] Read more.
This paper investigates the hydroelastic behavior of submersible circular seaweed platforms under wave action. The circular platform comprises circular collars constructed from high-density polyethylene (HDPE) pipes and seaweed grow-out lines arranged in the radial direction. The HDPE pipes may be filled with air, seawater, or pressurized seawater. The platform is kept in place by using a single-point mooring system and buoys. The platform may be lowered to over a hundred meters below the water surface to allow the seaweed to be soaked in cold nutrient-rich waters during the night and be raised to the surface for photosynthesis during the day. Also, the platform will be submerged during storms to avoid strong surface waves. The submergence is achieved by using a service vessel and surface buoys that secure the submerged platform with ropes. The hydroelastic analysis of the platform is performed using AquaSim software (v. 2.18), which has been developed specifically for hydroelastic analysis of aquaculture infrastructure. It is found that the hydroelastic response of the seaweed platform can be reduced by filling HDPE pipes with seawater and through the installation of seaweed grow-out lines. It is also found that the compressive stresses in HDPE pipes can be reduced by pressurizing the filled seawater, thereby keeping them below the allowable compressive stresses for severe sea states where pipes with unpressurized seawater show excessive compressive stresses. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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17 pages, 4225 KiB  
Article
Hydroelastic Response of a Moored Floating Flexible Circular Structure Applying BIEM
by Sarat Chandra Mohapatra and C. Guedes Soares
J. Mar. Sci. Eng. 2023, 11(12), 2322; https://doi.org/10.3390/jmse11122322 - 7 Dec 2023
Cited by 2 | Viewed by 1373
Abstract
A hydroelastic model associated with the interaction between a surface wave and a floating circular structure connected with mooring lines in finite water depth is developed using BIEM. The BIEM solution is achieved using free surface Green’s function and Green’s theorem. Furthermore, the [...] Read more.
A hydroelastic model associated with the interaction between a surface wave and a floating circular structure connected with mooring lines in finite water depth is developed using BIEM. The BIEM solution is achieved using free surface Green’s function and Green’s theorem. Furthermore, the algebraic equations for circular structural displacement are derived from the integro-differential equation. The correctness of the BIEM code is verified with the results of shear force and deflection amplitude existing in the literature, and the hydroelastic response of the circular structure is analyzed. The comparison results show a good level of agreement between the present results and those from other calculations. It is observed that the shear force, bending moment, and deflection decrease for higher values of stiffness of the mooring lines. The current study may be supportive of the visualization of the effect of mooring stiffness and to generalize articulated circular structure models for ocean space utilization. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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15 pages, 1040 KiB  
Article
Wave Resistance Caused by a Point Load Steadily Moving on the Surface of a Floating Viscoelastic Plate
by Zi Qi Wang and Dong Qiang Lu
J. Mar. Sci. Eng. 2023, 11(9), 1681; https://doi.org/10.3390/jmse11091681 - 25 Aug 2023
Cited by 1 | Viewed by 1066
Abstract
The wave resistance caused by a point load steadily moving on an infinitely extended viscoelastic plate floating on an inviscid fluid is analytically studied, which can be used to describe the response due to the motion of amphibious air-cushion vehicles on the continuous [...] Read more.
The wave resistance caused by a point load steadily moving on an infinitely extended viscoelastic plate floating on an inviscid fluid is analytically studied, which can be used to describe the response due to the motion of amphibious air-cushion vehicles on the continuous ice sheet on the ocean. The action of concentrated and distributed point loads are both considered. Under the assumptions that the fluid is incompressible and homogeneous and the motion of the fluid is irrotational, the Laplace equation is taken as the governing equation. For the floating plate, the Kelvin–Voigt viscoelastic model is employed. At the plate–fluid interface, linearized boundary conditions are used when the wave amplitude generated is less than its wavelength. The Fourier integral transform is performed to achieve the formal solution. The residue theorem is applied to derive the response of flexural–gravity wave resistance. It is indicated that for a point load with a uniform rectilinear motion, the wave resistance shows a sharp decrease with the increase in the moving speed when the load velocity is greater than the minimum phase velocity. There is no steady wave resistance when the load velocity is smaller than the minimum phase velocity. The effects of different parameters are obtained. Wave resistance decreases with the increasing plate thickness, viscoelastic parameter, and Poisson’s ratio, especially for a small value of viscoelastic parameter. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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17 pages, 5468 KiB  
Article
FEM-SPH Numerical Simulation of Impact Loading on Floating Laminates
by Ana Pavlović and Giangiacomo Minak
J. Mar. Sci. Eng. 2023, 11(8), 1590; https://doi.org/10.3390/jmse11081590 - 14 Aug 2023
Cited by 3 | Viewed by 1622
Abstract
The study of dynamic events such as impact and hydroelastic slamming is of great importance in determining the structural integrity of naval or maritime structures, particularly those made of composite materials. This topic has been investigated by numerous researchers using analytical, experimental, and [...] Read more.
The study of dynamic events such as impact and hydroelastic slamming is of great importance in determining the structural integrity of naval or maritime structures, particularly those made of composite materials. This topic has been investigated by numerous researchers using analytical, experimental, and numerical approaches. In this study, we propose using a hybrid numerical model combining smoothed-particle hydrodynamics (SPH) and the finite element method (FEM) to investigate the impact of external objects on floating laminates. The results show a good agreement with the available experimental data regarding the impact dynamic and some limitations in the damage determination. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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18 pages, 2969 KiB  
Article
Steady-State Motion of a Load on an Ice Cover with Linearly Variable Thickness in a Channel
by Konstantin Shishmarev, Tatyana Khabakhpasheva and Kristina Oglezneva
J. Mar. Sci. Eng. 2023, 11(5), 1045; https://doi.org/10.3390/jmse11051045 - 13 May 2023
Cited by 7 | Viewed by 1363
Abstract
The paper considers the visco-elastic response of the ice cover in a channel under an external load moving with constant speed along the center line. The channel has a rectangular cross-section with a finite depth and width. The fluid in the channel is [...] Read more.
The paper considers the visco-elastic response of the ice cover in a channel under an external load moving with constant speed along the center line. The channel has a rectangular cross-section with a finite depth and width. The fluid in the channel is inviscid and incompressible and its motion is potential. The fluid is covered by a thin sheet of ice frozen to the channel walls. The ice thickness varies linearly symmetrically across the channel, being lowest at the center of the channel and highest at the channel walls. Ice deflections and strains in the ice cover are independent of time in the coordinate system moving with the load. The problem is solved numerically using Fourier transform along the channel and the method of normal modes across the channel. The series coefficients for normal modes are determined by truncation for the resulting infinite systems of linear algebraic equations. The ice deflections and strains in the ice plate are investigated and compared to the case of constant mean ice thickness. It is shown that even a small variation of the ice thickness significantly changes the characteristics of the hydroelastic waves in the channel. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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17 pages, 4992 KiB  
Article
Hydroelastic Response to the Effect of Current Loads on Floating Flexible Offshore Platform
by Pouria Amouzadrad, Sarat Chandra Mohapatra and Carlos Guedes Soares
J. Mar. Sci. Eng. 2023, 11(2), 437; https://doi.org/10.3390/jmse11020437 - 16 Feb 2023
Cited by 7 | Viewed by 2285
Abstract
An analytical model of a current load’s interaction with a moored floating flexible structure based on the Timoshenko–Mindlin beam theory is developed under the assumption of small-amplitude wave theory and the structural response. Theoretical solutions on the displacement of the structure, reflection, and [...] Read more.
An analytical model of a current load’s interaction with a moored floating flexible structure based on the Timoshenko–Mindlin beam theory is developed under the assumption of small-amplitude wave theory and the structural response. Theoretical solutions on the displacement of the structure, reflection, and transmission coefficients are obtained by applying the matching technique along with the orthogonal model coupling relation. The results of the transmission coefficient and displacement amplitude are compared with the other calculations and experimental datasets available in the literature. The structural deflection and transmission coefficients are investigated via the hydroelastic response for wave–current loads along with design parameters. The comparison results showed that the present model result is supported by the numerical model’s results. This present analysis can provide further information for marine engineers to design floating flexible platforms in the marine environment. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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24 pages, 8539 KiB  
Article
Hydroelastic Response to Oblique Wave Incidence on a Floating Plate with a Submerged Perforated Base
by Sarat Chandra Mohapatra and C. Guedes Soares
J. Mar. Sci. Eng. 2022, 10(9), 1205; https://doi.org/10.3390/jmse10091205 - 28 Aug 2022
Cited by 8 | Viewed by 2240
Abstract
A hydroelastic model is developed of a floating flexible structure in the presence of a submerged perforated base connected with mooring lines under oblique wave action. Using the velocity decomposition method, the analytical solution of the referred model is obtained in finite water [...] Read more.
A hydroelastic model is developed of a floating flexible structure in the presence of a submerged perforated base connected with mooring lines under oblique wave action. Using the velocity decomposition method, the analytical solution of the referred model is obtained in finite water depth. The convergence of the analytical solution for different oblique wave incidences is examined, and the present results of deflection amplitude are compared with experimental datasets and the numerical results available in the literature. The effects of oblique wave incidence, along with various design parameters on the reflection, transmission, and dissipation coefficients, as well as structural displacements, are analysed through hydroelastic analysis. Further, the effect of oblique incidence angle on the free oscillation hydroelastic waves in two wave modes is investigated by deriving the free motion velocity potential in a wave basin. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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Review

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20 pages, 8443 KiB  
Review
A Review of the Hydroelastic Theoretical Models of Floating Porous Nets and Floaters for Offshore Aquaculture
by Sarat Chandra Mohapatra and C. Guedes Soares
J. Mar. Sci. Eng. 2024, 12(10), 1699; https://doi.org/10.3390/jmse12101699 - 25 Sep 2024
Cited by 1 | Viewed by 996
Abstract
The present review focuses on the theoretical model developments made in floating flexible net fish cages and the floating bodies application to offshore aquaculture. A brief discussion of the essential mathematical equations related to various theoretical models of flexible net cages in the [...] Read more.
The present review focuses on the theoretical model developments made in floating flexible net fish cages and the floating bodies application to offshore aquaculture. A brief discussion of the essential mathematical equations related to various theoretical models of flexible net cages in the frequency domain is presented. The single and array of floating or submerged flexible net cages connected with or without mooring lines are discussed. Further, as the combined effect of the hydroelastic behaviour of floaters and the flexible behaviour of fish cages are necessary to assess their efficiency and survivability from structural damages, the issues and the knowledge gap between the recent and future models are also discussed. In conclusion, the practical suggestions concerning advancements in future research and directions within floating flexible net cages and the hydroelastic response of elastic floaters are highlighted. Full article
(This article belongs to the Special Issue Hydroelastic Behaviour of Floating Offshore Structures)
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