Symmetry/Asymmetry in Ocean Engineering

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 2133

Special Issue Editors


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Guest Editor
School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: ship propulsion; hydrodynamics; hydroacoustics; optimal design of ship propulsors

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Guest Editor
School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK
Interests: arctic engineering; ocean sustainability; renewable energy; maritime decarbonisation
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Guest Editor
1. Marine and Arctic Technology, Department of Mechanical Engineering, Aalto University, Espoo, Finland
2. Ecosystems and Environment Research Programme, University of Helsinki, Helsinki, Finland
Interests: maritime risk analysis; shipping in ice; intelligent ships and operations
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue explores the intricate relationship between symmetry and asymmetry in the field of ocean engineering. Ocean engineering involves designing and implementing various structures and systems to operate in the marine environment, addressing challenges related to hydrodynamics, wave loads, and structural integrity.

Symmetry and asymmetry play crucial roles in the performance and behavior of ocean engineering systems. With this Special Issue, we aim to bring together a collection of research articles that delve into different aspects of symmetry and asymmetry, providing valuable insights and advancements in the field. We aim to cover a wide range of topics, including the analysis of symmetric and asymmetric wave interactions, the design and optimization of symmetric and asymmetric hull forms, the study of propulsion systems with symmetrical or asymmetrical configurations, and the examination of hydrodynamic forces on symmetric and asymmetric offshore structures.

By focusing on symmetry and asymmetry, this Special Issue aims to enhance the understanding of their effects on ocean engineering systems, contributing to the development of more efficient, reliable, and sustainable solutions for various marine applications.

Dr. Youjiang Wang
Dr. Luofeng Huang
Dr. Liangliang Lu
Guest Editors

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Keywords

  • hydrodynamics
  • hull design
  • offshore structure
  • wave loads
  • propulsion system
  • sustainable solution

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Published Papers (2 papers)

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Research

15 pages, 5762 KiB  
Article
A Symmetric Experimental Study of the Interaction Between Regular Waves and a Pontoon Breakwater with Novel Fin Attachments
by Xiangcheng Lyu, Yifeng Yang, Chenhao Mi, Chi Man Tang, Lukman Adeboye, Mohamed Farhan, Stan Collins, Binjian Ou, Anson Wong, John Gordon Duffy and Luofeng Huang
Symmetry 2024, 16(12), 1605; https://doi.org/10.3390/sym16121605 - 2 Dec 2024
Viewed by 556
Abstract
Floating breakwaters are widely applied on the ocean water surface to protect human infrastructure from the destructive power of waves. This study designs and investigates the performance of a novel symmetric-pontoon floating breakwater with a symmetric pair of hydrofoils. Based at the Cranfield [...] Read more.
Floating breakwaters are widely applied on the ocean water surface to protect human infrastructure from the destructive power of waves. This study designs and investigates the performance of a novel symmetric-pontoon floating breakwater with a symmetric pair of hydrofoils. Based at the Cranfield Ocean Systems Laboratory, the system was constructed and tested in various wave conditions using different fin configurations. The floating structure was anchored using a symmetric four-point mooring system. The tested waves were regular and symmetric perpendicular to the propagating direction. Key parameters, including the attenuated wave amplitude, motions of the breakwater, and the mooring forces, were measured. The wave parameters utilised for testing covered 1.61–5.42 relative wavelength to structural length, with wave heights of 3 cm and 5 cm. Results showed the 90° fin configuration can reduce wave transmission by up to 74%, with the lowest mooring forces at 3.05 relative wavelength, enhancing the performance of wave energy dissipation and structural seakeeping. At 90° setup, the mooring force was lowest at 2.41 relative wavelength. This research can inform novel designs of breakwaters to improve protection abilities for coastal cities and offshore infrastructures, especially renewable energy systems. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Ocean Engineering)
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25 pages, 13621 KiB  
Article
Exploiting Axisymmetry to Optimize CFD Simulations—Heave Motion and Wave Radiation of a Spherical Buoy
by Josh Davidson, Vincenzo Nava, Jacob Andersen and Morten Bech Kramer
Symmetry 2024, 16(9), 1252; https://doi.org/10.3390/sym16091252 - 23 Sep 2024
Viewed by 885
Abstract
Simulating the free decay motion and wave radiation from a heaving semi-submerged sphere poses significant computational challenges due to its three-dimensional complexity. By leveraging axisymmetry, we reduce the problem to a two-dimensional simulation, significantly decreasing computational demands while maintaining accuracy. In this paper, [...] Read more.
Simulating the free decay motion and wave radiation from a heaving semi-submerged sphere poses significant computational challenges due to its three-dimensional complexity. By leveraging axisymmetry, we reduce the problem to a two-dimensional simulation, significantly decreasing computational demands while maintaining accuracy. In this paper, we exploit axisymmetry to perform a large ensemble of Computational Fluid Dynamics (CFDs) simulations, aiming to evaluate and maximize both accuracy and efficiency, using the Reynolds Averaged Navier–Stokes (RANS) solver interFOAM, in the opensource finite volume CFD software OpenFOAM. Validated against highly accurate experimental data, extensive parametric studies are conducted, previously limited by computational constraints, which facilitate the refinement of simulation setups. More than 50 iterations of the same heaving sphere simulation are performed, informing efficient trade-offs between computational cost and accuracy across various simulation parameters and mesh configurations. Ultimately, by employing axisymmetry, this research contributes to the development of more accurate and efficient numerical modeling in ocean engineering. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Ocean Engineering)
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