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Selected Papers from the ASRANet International Conference on Offshore Renewable...
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Selected Papers from the ASRANet International Conference on Offshore Renewable Energy

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312).

Deadline for manuscript submissions: closed (31 August 2015) | Viewed by 23764

Special Issue Editor

Dr. Björn Elsäßer

E-Mail Website
Guest Editor
School of Planning, Architecture and Civil Engineering, Queen's University Belfast, Northern Ireland BT7 1NN, UK
Interests: coastal engineering; naval architecture; hydrodynamic modeling; fluid mechanics; numerical simulation; numerical modeling; hydrodynamics; marine ecology; hydraulics; experimental fluid mechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Marine renewable energy has been a topic of research for a considerable number of years. Projects in the early 1970s identified wave and tidalpower as vast resources from which renewable energy is available to be extracted. However, technological challenges were identified, and with oil prices falling in the mid-1980s, the appetite for developing offshore renewable energy dropped.

Since the turn of the century, a resurgence of interest in tidal, wave, and offshore wind power has been observed, for both research and commercial applications. Offshore renewable energy has the potential to provide a large amount of power that can be sustainable; this form of renewable energy can also provide security of supply and price stability. It is estimated that by mid-2015, the installed global wind power capacity will be greater than the installed global capacity of nuclear power. Very few would have predicted this development fifteen years ago, but many now foresee a similar development in offshore renewable energy.

However, there are still significant challenges, and in some areas, little is known or understood about the marine environment. Thus, the ASRANet Conference on Offshore Renewable Energy, which was held in Glasgow on September 2014, brought together researchers, engineers, and scientists from academia, industry, and regulators to discuss some of these issues. This Special Issue presents a selection of papers from the conference; the papers both give insight into current research and commercial developments and highlight some of the areas where further research is required.

Dr. Björn Elsäßer
Guest Editor

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

  • tidal energy
  • wind energy
  • wave energy
  • ocean energy
  • offshore foundations
  • mooring loads
  • wave resource
  • wind climate
  • marine turbulence

Published Papers (4 papers)

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Research

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2520 KiB  
Article
Design Optimization for a Truncated Catenary Mooring System for Scale Model Test
by Climent Molins, Pau Trubat, Xavi Gironella and Alexis Campos
J. Mar. Sci. Eng. 2015, 3(4), 1362-1381; https://doi.org/10.3390/jmse3041362 - 06 Nov 2015
Cited by 18 | Viewed by 7115
Abstract
One of the main aspects when testing floating offshore platforms is the scaled mooring system, particularly with the increased depths where such platforms are intended. The paper proposes the use of truncated mooring systems to emulate the real mooring system by solving an [...] Read more.
One of the main aspects when testing floating offshore platforms is the scaled mooring system, particularly with the increased depths where such platforms are intended. The paper proposes the use of truncated mooring systems to emulate the real mooring system by solving an optimization problem. This approach could be an interesting option when the existing testing facilities do not have enough available space. As part of the development of a new spar platform made of concrete for Floating Offshore Wind Turbines (FOWTs), called Windcrete, a station keeping system with catenary shaped lines was selected. The test facility available for the planned experiments had an important width constraint. Then, an algorithm to optimize the design of the scaled truncated mooring system using different weights of lines was developed. The optimization process adjusts the quasi-static behavior of the scaled mooring system as much as possible to the real mooring system within its expected maximum displacement range, where the catenary line provides the restoring forces by its suspended line length. Full article
(This article belongs to the Special Issue Selected Papers from the ASRANet International Conference on Offshore Renewable Energy)
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1530 KiB  
Article
Reducing Reliability Uncertainties for Marine Renewable Energy
by Sam D. Weller, Philipp R. Thies, Tessa Gordelier and Lars Johanning
J. Mar. Sci. Eng. 2015, 3(4), 1349-1361; https://doi.org/10.3390/jmse3041349 - 05 Nov 2015
Cited by 16 | Viewed by 5246
Abstract
Technology Readiness Levels (TRLs) are a widely used metric of technology maturity and risk for marine renewable energy (MRE) devices. To-date, a large number of device concepts have been proposed which have reached the early validation stages of development (TRLs 1–3). Only a [...] Read more.
Technology Readiness Levels (TRLs) are a widely used metric of technology maturity and risk for marine renewable energy (MRE) devices. To-date, a large number of device concepts have been proposed which have reached the early validation stages of development (TRLs 1–3). Only a handful of mature designs have attained pre-commercial development status following prototype sea trials (TRLs 7–8). In order to navigate through the aptly named “valley of death” (TRLs 4–6) towards commercial realisation, it is necessary for new technologies to be de-risked in terms of component durability and reliability. In this paper the scope of the reliability assessment module of the DTOcean Design Tool is outlined including aspects of Tool integration, data provision and how prediction uncertainties are accounted for. In addition, two case studies are reported of mooring component fatigue testing providing insight into long-term component use and system design for MRE devices. The case studies are used to highlight how test data could be utilised to improve the prediction capabilities of statistical reliability assessment approaches, such as the bottom–up statistical method. Full article
(This article belongs to the Special Issue Selected Papers from the ASRANet International Conference on Offshore Renewable Energy)
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3580 KiB  
Article
A Novel Mooring Tether for Highly-Dynamic Offshore Applications; Mitigating Peak and Fatigue Loads via Selectable Axial Stiffness
by Tessa Gordelier, David Parish, Philipp R. Thies and Lars Johanning
J. Mar. Sci. Eng. 2015, 3(4), 1287-1310; https://doi.org/10.3390/jmse3041287 - 22 Oct 2015
Cited by 23 | Viewed by 6438
Abstract
Highly-dynamic floating bodies such as wave energy convertors require mooring lines with particular mechanical properties; the mooring system must achieve adequate station keeping whilst controlling mooring tensions within acceptable limits. Optimised compliant mooring systems can meet these requirements but where compliance is achieved [...] Read more.
Highly-dynamic floating bodies such as wave energy convertors require mooring lines with particular mechanical properties; the mooring system must achieve adequate station keeping whilst controlling mooring tensions within acceptable limits. Optimised compliant mooring systems can meet these requirements but where compliance is achieved through system architecture, the complexity of the system increases together with the mooring footprint. This work introduces the “Exeter Tether”, a novel fibre rope mooring tether providing advantages over conventional fibre ropes. The tether concept aims to provide a significantly lower axial stiffness by de-coupling this attribute from the minimum breaking load of the line. A benefit of reduced axial stiffness is the reduction of mooring system stiffness providing a reduction of peak and fatigue loads, without increasing mooring system complexity. Reducing these loads improves system reliability and allows a reduction in mass of both the mooring system and the floating body, thus reducing costs. The principles behind the novel tether design are presented here, along with an outline of eight prototype tether variants. Results from the proof of concept study are given together with preliminary findings from sea trials conducted in Falmouth Bay. Results demonstrate that the Exeter Tether can be configured to achieve a significantly lower axial stiffness than conventional fibre rope and that the stiffness is selectable within limits for a given breaking strength. Strain values greater than 0.35 are achieved at 30% of line breaking strength; this represents more than a threefold increase of the strain achievable with a conventional rope of the same material. The tether was subjected to six months of sea trials to establish any threats to its own reliability and to inform future design enhancements in this respect. Full article
(This article belongs to the Special Issue Selected Papers from the ASRANet International Conference on Offshore Renewable Energy)
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Review

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990 KiB  
Review
Identification of the Uncertainties for the Calibration of the Partial Safety Factors for Load in Tidal Turbines
by Gaizka Zarraonandia Simeón and Claudio Bittencourt Ferreira
J. Mar. Sci. Eng. 2016, 4(1), 20; https://doi.org/10.3390/jmse4010020 - 02 Mar 2016
Cited by 1 | Viewed by 4166
Abstract
Tidal energy is nowadays one of the fastest growing types of marine renewable energy. In particular, Horizontal Axis Tidal Turbines (HATTs) are the most advanced designs and the most appropriate for standardization. This paper presents a review of actual design criteria focusing on [...] Read more.
Tidal energy is nowadays one of the fastest growing types of marine renewable energy. In particular, Horizontal Axis Tidal Turbines (HATTs) are the most advanced designs and the most appropriate for standardization. This paper presents a review of actual design criteria focusing on the identification of the uncertainties that technology developers need to address during the design process. Key environmental parameters like turbine inflow conditions or predictions of extreme values are still grey areas due to the lack of site measurements and the uncertainty in metocean model predictions. A comparison of turbulence intensity characterization using different tools and at different points in time shows the uncertainty in the prediction of this parameter. Numerical models of HATTs are still quite uncertain, often dependent on experience of the people running them. In the reliability-based calibration of partial safety factors, the uncertainties need to be reflected on the limit state formulation. This paper analyses the different types of uncertainties present in the limit state equation. These uncertainties are assessed in terms of stochastic variables in the limit state equation. In some cases, advantage can be taken from the experience from offshore wind and oil and gas industries. Tidal turbines have a mixture of the uncertainties present in both industries with regard to partial safety factor calibration. Full article
(This article belongs to the Special Issue Selected Papers from the ASRANet International Conference on Offshore Renewable Energy)
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