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Hydrodynamic Research of Marine Structures
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Hydrodynamic Research of Marine 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: 5 September 2024 | Viewed by 2336

Special Issue Editors

Dr. Dimitrios N. Konispoliatis

E-Mail Website
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
Prof. Dr. Spyros A. Mavrakos

E-Mail Website
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

Special Issue Information

Dear Colleagues,

Hydrodynamics plays a crucial role in the design and analysis of marine structures, as it involves the study of the motion of fluid and its interaction with different types of structures in a marine environment. This Special Issue aims to bring together the latest advancements and insights in the field of hydrodynamics that are specific to marine structures, providing a platform for researchers to share their findings, methodologies, and applications. Specific topics of interest for submission include, but are not limited to, the following:

  • The hydrodynamic characterization of marine structures: papers addressing the assessment and modeling of hydrodynamic loads, including wave loads, wind loads, and current loads, on different types of marine structures;
  • Design optimization and performance enhancement: papers focusing on the application of hydrodynamic research to optimize the design and enhance the performance of marine structures in terms of stability, safety, efficiency, and sustainability;
  • Hydrodynamic analysis and simulation techniques: papers exploring novel computational methods, experimental techniques, or hybrid approaches for the analysis and simulation of hydrodynamic phenomena and their effects on marine structures;
  • Fluid–structure interactions: papers investigating the complex interaction between fluids and structures, including the response, vibration, and resonance of marine structures under dynamic loads;
  • Case studies and practical applications: papers showcasing real-world applications and case studies highlighting the importance of hydrodynamic research in the design, operation, maintenance, and risk assessment of marine structures.

We encourage researchers, academicians, and industry professionals from various disciplines such as naval architecture, offshore engineering, civil engineering, fluid mechanics, and computational engineering to contribute to this Special Issue. We welcome both theoretical and applied research papers that present new insights, methodologies, and practical solutions in the field of hydrodynamic research on marine structures.

Dr. Dimitrios N. Konispoliatis
Prof. Dr. Spyros A. Mavrakos
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

  • hydrodynamics
  • marine structures
  • fluid motion
  • hydrodynamic load
  • wave load
  • fluid-structure interaction

Published Papers (4 papers)

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Research

28 pages, 1246 KiB  
Article
Hydrodynamic Behavior of a Submerged Spheroid in Close Proximity to the Sea Surface
by Anargyros S. Mavrakos, Dimitrios N. Konispoliatis and Spyridon A. Mavrakos
J. Mar. Sci. Eng. 2024, 12(6), 893; https://doi.org/10.3390/jmse12060893 - 27 May 2024
Viewed by 152
Abstract
The principal objective of this investigation is to assess the hydrodynamic characteristics and the exciting forces induced by waves acting upon a shallowly submerged spheroid. This study focuses on an arbitrarily shaped spheroid body with a vertical axis, fully immersed beneath the free [...] Read more.
The principal objective of this investigation is to assess the hydrodynamic characteristics and the exciting forces induced by waves acting upon a shallowly submerged spheroid. This study focuses on an arbitrarily shaped spheroid body with a vertical axis, fully immersed beneath the free surface within waters of finite depth. The methodology outlined here necessitates solving the linear hydrodynamic diffraction and radiation problems, which entail discretizing the flow field around the body into ring-shaped fluid regions. Within each region, expansions of axisymmetric eigenfunctions of the velocity potential are employed. Complementing the theoretical framework, numerical methodologies are employed utilizing panel models across the wetted surface of the submerged body. Extensive numerical results concerning the exciting forces induced and the hydrodynamic coefficients are presented in the framework of frequency domain formulations. Through the current analysis, the phenomenon of negative added mass and rapid variations in the added mass and damping coefficients is confirmed, attributed to the free surface effect elucidated in terms of the presence of near-resonant standing waves above the submerged body. Full article
(This article belongs to the Special Issue Hydrodynamic Research of Marine Structures)
21 pages, 6501 KiB  
Article
Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements
by Xing Chang, Pandeng Yin, Jianjian Xin, Fulong Shi and Ling Wan
J. Mar. Sci. Eng. 2024, 12(5), 832; https://doi.org/10.3390/jmse12050832 - 16 May 2024
Viewed by 463
Abstract
To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under the wall effect, the two-dimensional (2D) flows around the near-wall single, two tandem and parallel cylinders are simulated under different gap ratios (0.15 ≤ G/D ≤ 3.0) and spacing [...] Read more.
To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under the wall effect, the two-dimensional (2D) flows around the near-wall single, two tandem and parallel cylinders are simulated under different gap ratios (0.15 ≤ G/D ≤ 3.0) and spacing ratios (1.5 ≤ T/D ≤ 4.0) at a Reynolds number of Re = 6300. We also examine the wake patterns, the force coefficients, and the vortex-shedding frequency with emphases on the wall effect and effects of the two-cylinder interference. A critical wall gap of G/D = 0.6 is identified in the single-cylinder case where the wall can exert significant influences. The two near-wall tandem cylinders exhibit three wake states: stretching mode, attachment mode, and impinging mode. The force coefficients on the upstream cylinder are significantly affected by the wall for G/D ≤ 0.6. The downstream cylinder is mainly influenced by the upstream cylinder. For G/D > 0.6, the force coefficients on the two cylinders exhibit a similar variation trend. In the parallel arrangement, the two cylinders exhibit four wake states in different G/D and T/D ranges: double stretching mode, hetero-vortex scale mode, unilateral vortex mode, and free vortex mode. Moreover, the two parallel cylinders in the hetero-vortex scale or free vortex mode have two states: synchronous in-phase state and synchronous out-of-phase state. The mean drag coefficients on the two cylinders decrease, while the mean lift coefficients exhibit opposite variation trends, as the T/D grows. Full article
(This article belongs to the Special Issue Hydrodynamic Research of Marine Structures)
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24 pages, 5490 KiB  
Article
Concept Design of a 15 MW TLP-Type Floating Wind Platform for Korean Offshore Installation
by Sung Youn Boo, Yoon-Jin Ha, Steffen Allan Shelley, Ji-Yong Park, Chang-Hyuck Lim and Kyong-Hwan Kim
J. Mar. Sci. Eng. 2024, 12(5), 796; https://doi.org/10.3390/jmse12050796 - 10 May 2024
Viewed by 570
Abstract
Offshore wind farms on the east offshore of Korea to produce multi-GW power from floating wind platforms are being planned. The objectives of the present study are to develop a new TLP-type floating wind platform with a 15 MW turbine for the planned [...] Read more.
Offshore wind farms on the east offshore of Korea to produce multi-GW power from floating wind platforms are being planned. The objectives of the present study are to develop a new TLP-type floating wind platform with a 15 MW turbine for the planned site and to confirm the feasibility of the TLP design under extreme typhoon environments. The concept design of the 15 MW TLP floating platform was completed for installation at a water depth of 137 m. The platform was vertically moored with highly pretensioned wire rope tendons. The platform and tendons were designed to withstand extreme conditions for up to 50 years. Additionally, a platform with an integrated turbine was designed to be wet-towable from the quayside without dedicated vessels to minimize the pre-service cost and risk. An extreme response analysis was conducted to evaluate the platform motion, acceleration, airgap and tendon tension for wave variation, intact and damaged condition of the tendon, environment heading change, and water level variation. The platform design results were validated using the design criteria from the industry standards and recommendations, and the design was verified to comply with the design requirements for the planned sites. Full article
(This article belongs to the Special Issue Hydrodynamic Research of Marine Structures)
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23 pages, 9903 KiB  
Article
Dynamic Analysis of a Barge-Type Floating Wind Turbine Subjected to Failure of the Mooring System
by Mingsheng Chen, Lenan Yang, Xinghan Sun, Jin Pan, Kai Zhang, Lin Lin, Qihao Yun and Ziwen Chen
J. Mar. Sci. Eng. 2024, 12(4), 617; https://doi.org/10.3390/jmse12040617 - 3 Apr 2024
Viewed by 783
Abstract
Evidence points to increasing the development of floating wind turbines to unlock the full potential of worldwide wind-energy generation. Barge-type floating wind turbines are of interest because of their shallow draft, structural simplicity, and moonpool-damping effect. Based on the BEM potential flow method, [...] Read more.
Evidence points to increasing the development of floating wind turbines to unlock the full potential of worldwide wind-energy generation. Barge-type floating wind turbines are of interest because of their shallow draft, structural simplicity, and moonpool-damping effect. Based on the BEM potential flow method, this study uses ANSYS-AQWA software to create a floating-barge moonpool platform model equipped with an OC5 NREL 5 MW wind turbine, to study the effect of the damping lid method on the resonance of the moonpool gap water, the wind–wave coupling effect, and the dynamic response of the FOWT and mooring system after single-line and double-line failure. The results show that the damping lid method, based on the potential flow theory, can effectively correct the effect caused by the lack of viscosity; the effect of a single breakage of upwind mooring lines on the motion is mainly in the sway and yaw modes, and after mooring line 8 breaks, the maximum tension of the adjacent mooring line increases by 2.91 times compared to the intact condition, which is 58.9% of the minimum breaking strength; and the breakage of two mooring lines located at one corner leads to a surge drift of up to 436.7 m and a cascading failure phenomenon. Full article
(This article belongs to the Special Issue Hydrodynamic Research of Marine Structures)
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