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JMSE
Special Issues
Hydrodynamics of Fish Cages and Floating Permeable Structures
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Hydrodynamics of Fish Cages and Floating Permeable 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 May 2023) | Viewed by 5414

Special Issue Editors

Prof. Dr. Spyros A. Mavrakos

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Guest Editor
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Heroon Polytechniou Ave. 9, 157 73 Athens, Greece
Interests: hydrodynamics of floating offshore structures; body–wave–current interactions; higher order effects; static and dynamic analysis of mooring systems; fish cages; fish farms; wave energy device analysis and efficiency evaluation; arrays of devices; floating wind turbines and multi-purpose floating marine energy platforms
Special Issues, Collections and Topics in MDPI journals
Dr. Dimitrios N. Konispoliatis

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Guest Editor
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Heroon Polytechniou Ave. 9, 15773 Zografou, Athens, Greece
Interests: porous floating structures; wave energy converters; oscillating water column devices; arrays of bodies; mean drift second-order forces; hydrodynamics and loadings on floating structures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Floating permeable structures offer a vast potential for growth. The great majority of them correspond to fish farming applications, which should be able to withstand the severe wave and current loads at installation locations. Furthermore, permeable structures are widely applied in the coastal and offshore industry for shore protection and the reduction of wave loads, whereas recently, several wind and fish farm systems have been reported in the marine sector to an early stage of application.

This Special Issue of JMSE is dedicated to recent advances in the area of floating permeable structures. The aim is to demonstrate hydrodynamic analyses of novel types of fish cages and/or fish nets, multi-purpose floating aquaculture systems, fish farms, permeable structures of arbitrary shape, etc., for offshore applications applying different types of numerical and theoretical models or state-of-the-art experimental testing.

Prof. Dr. Spyros A. Mavrakos
Dr. Dimitrios N. Konispoliatis
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 aquaculture
  • fish cages
  • elastic porous bodies
  • permeable structures
  • waves and current
  • linear and no linear wave theory
  • hybrid aquaculture ocean systems

Published Papers (3 papers)

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Research

23 pages, 3127 KiB  
Article
Mean Drift Wave Forces on Arrays of Bodies Surrounded by Thin Porous Surfaces
by Dimitrios N. Konispoliatis and Spyridon A. Mavrakos
J. Mar. Sci. Eng. 2023, 11(7), 1269; https://doi.org/10.3390/jmse11071269 - 22 Jun 2023
Cited by 1 | Viewed by 730
Abstract
A semi-analytical solution is presented for the evaluation of mean drift wave forces on arrays of structures composed of impermeable vertical cylindrical bodies and surrounded by thin, porous surfaces. The porous cell is assumed to have fine pores so that a linear pressure [...] Read more.
A semi-analytical solution is presented for the evaluation of mean drift wave forces on arrays of structures composed of impermeable vertical cylindrical bodies and surrounded by thin, porous surfaces. The porous cell is assumed to have fine pores so that a linear pressure drop can be considered. The mean drift wave forces on the array are determined via two principally different approaches: the momentum conservation theory and the direct integration of all pressure contributions upon the bodies’ instantaneous wetted surfaces. A solution method that solves the corresponding diffraction problem following the multiple scattering approach is proposed to account for the hydrodynamic interaction phenomena between the waves and the bodies. Numerical results are presented which illustrate the consistency of each of the two approaches in accurately evaluating the mean wave drift forces on several examined array configurations. It is shown that the thin, porous surface significantly reduces the drift forces on the array of bodies, whereas at specific wave frequencies, local enhancements of the forces’ values are noted due to the amplified wave field between the members of the array. Full article
(This article belongs to the Special Issue Hydrodynamics of Fish Cages and Floating Permeable Structures)
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24 pages, 3241 KiB  
Article
Hydrodynamics of a Moored Permeable Vertical Cylindrical Body
by Dimitrios N. Konispoliatis, Ioannis K. Chatjigeorgiou and Spyros A. Mavrakos
J. Mar. Sci. Eng. 2022, 10(3), 403; https://doi.org/10.3390/jmse10030403 - 10 Mar 2022
Cited by 1 | Viewed by 2582
Abstract
In this study, the problems of diffraction and radiation of water waves by a permeable vertical cylindrical body are formulated within the realm of the linear potential theory. The body, which is floating in constant water depth, is moored with a catenary mooring [...] Read more.
In this study, the problems of diffraction and radiation of water waves by a permeable vertical cylindrical body are formulated within the realm of the linear potential theory. The body, which is floating in constant water depth, is moored with a catenary mooring line system. The method of matched eigenfunction expansions for the prediction of the velocity potential in the fluid domain surrounding the body is applied. Furthermore, the static and dynamic characteristics of the mooring system are combined with the hydrodynamics of the body, to set up the coupled motion equations of the dynamical model, i.e., floater and mooring system, in the frequency domain. Numerical results obtained through the developed solution are presented. The results revealed that porosity plays a key role in reducing/controlling the exciting wave loads. As far as the mooring system is concerned, its quasi-static and dynamic characteristics, by employing several motion directions on the fairlead in accordance to varying environmental conditions, are examined, highlighting their effect on the body’s motions. Full article
(This article belongs to the Special Issue Hydrodynamics of Fish Cages and Floating Permeable Structures)
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26 pages, 12868 KiB  
Article
A Semi-Analytical Model for Studying Hydroelastic Behaviour of a Cylindrical Net Cage under Wave Action
by Mingyuan Ma, Hong Zhang, Dong-Sheng Jeng and Chien Ming Wang
J. Mar. Sci. Eng. 2021, 9(12), 1445; https://doi.org/10.3390/jmse9121445 - 16 Dec 2021
Cited by 6 | Viewed by 2078
Abstract
In the present study, a semi-analytical model based on the small-amplitude wave theory is developed to describe the wave fields around a single gravity-type cylindrical open fish net cage. The cage may be submerged to different depths below the free-water surface. The fish [...] Read more.
In the present study, a semi-analytical model based on the small-amplitude wave theory is developed to describe the wave fields around a single gravity-type cylindrical open fish net cage. The cage may be submerged to different depths below the free-water surface. The fish cage net is modelled as a flexible porous membrane, and the deflection of the net chamber is expressed by the transverse vibration equation of strings. The velocity potential is expanded in the form of the Fourier–Bessel series and the unknown coefficients in these series are determined from matching the boundary conditions and the least squares method. The number of terms for the series solution to be used is determined from convergence studies. The model results exhibit significant hydroelastic characteristics of the net cages, including the distribution properties of wave surface, pressure drop at the net interface, structural deflection, and wave loading along the cage height. In addition, the relationships between wave forces on the net cage with hydrodynamic and structural parameters are also revealed. The findings presented herein should be useful to engineers who are designing fish cage systems. Full article
(This article belongs to the Special Issue Hydrodynamics of Fish Cages and Floating Permeable Structures)
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