Optimization of the geometry and the turbine induced damping for fixed detached and asymmetric OWC devices: A numerical study

Simonetti, Irene; Cappietti, Lorenzo; Elsafti, Hisham; Oumeraci, Hocine

doi:10.1016/j.energy.2017.08.033

Cited by 78 publications

(41 citation statements)

References 40 publications

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“…The accentuated influence of the turbine damping on the device performance highlights the importance of the appropriate selection of the turbine damping when designing an OWC device, as shown previously by, e.g., [49,[74][75][76][77][78]. For the wave conditions and damping coefficient values tested, the largest damping coefficient (B * = 64.10) is the one showing, generally, the highest values of C WR .…”

Section: Discussionmentioning

confidence: 76%

“…Indeed, following the best-fit equation, and considering the diameter of the OWC chamber (8 m, at prototype scale) as the width of the device, a C WR value of about 15.5% is to be expected. Notwithstanding, previous work has shown that maximum values that are remarkably higher can be attained, e.g., 80% [60] or 87% [76]. In principle, these figures would appear to indicate that there is plenty of margin to optimise the performance of the OWC chamber.…”

Section: Discussionmentioning

confidence: 93%

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A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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Abstract:The growth of the offshore wind industry in the last couple of decades has made this technology a key player in the maritime sector. The sustainable development of the offshore wind sector is crucial for this to consolidate within a global scenario of climate change and increasing threats to the marine environment. In this context, multipurpose platforms have been proposed as a sustainable approach to harnessing different marine resources and combining their use under the same platform. Hybrid wind-wave systems are a type of multipurpose platform where a single platform combines the exploitation of offshore wind and wave energy. In particular, this paper deals with a novel hybrid wind-wave system that integrates an oscillating water column wave energy converter with an offshore wind turbine on a jacket-frame substructure. The main objective of this paper is to characterise the hydrodynamic response of the WEC sub-system of this hybrid energy converter. A 1:50 scale model was tested under regular and irregular waves to characterise the hydrodynamic response of the WEC sub-system. The results from this analysis lead to the proof of concept of this novel hybrid system; but additionally, to characterising its behaviour and interaction with the wave field, which is a requirement for fully understanding the benefits of hybrid systems.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 93%

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

2018

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“…The first one is a floating closed box (referred to as "BOX" hereafter), and the second one is the model of a generic floating "OWC WEC." The geometry of the OWC WEC tested during this study corresponds closely to that of the fixed OWC WEC previously studied at LABIMA-WCF, both experimentally and numerically ( [11,19,21]).…”

Section: Floating Bodies Of the Tested Box And Owc Wec Scale Modelsmentioning

confidence: 75%

Efficiency and Survivability of a Floating Oscillating Water Column Wave Energy Converter Moored to the Seabed: An Overview of the EsflOWC MaRINET2 Database

Kisacik

Stratigaki

et al. 2020

Water

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Floating oscillating water column (OWC) type wave energy converters (WECs), compared to fixed OWC WECs that are installed near the coastline, can be more effective as they are subject to offshore waves before the occurrence of wave dissipation at a nearshore location. The performance of floating OWC WECs has been widely studied using both numerical and experimental methods. However, due to the complexity of fluid–structure interaction of floating OWC WECs, most of the available studies focus on 2D problems with WEC models of limited degrees-of-freedom (DOF) of motion, while 3D mooring effects and multiple-DOF OWC WECs have not been extensively investigated yet under 2D and 3D wave conditions. Therefore, in order to gain a deeper insight into these problems, the present study focuses on wave flume experiments to investigate the motion and mooring performance of a scaled floating OWC WEC model under 2D wave conditions. As a preparatory phase for the present MaRINET2 EsflOWC (efficiency and survivability of floating OWC) project completed at the end of 2017, experiments were also carried out in advance in the large wave flume of Ghent University. The following data were obtained during these experimental campaigns: multiple-DOF OWC WEC motions, mooring line tensions, free surface elevations throughout the wave flume, close to and inside the OWC WEC, change in the air pressure inside the OWC WEC chamber and velocity of the airflow through the vent on top of the model. The tested wave conditions mostly include nonlinear intermediate regular waves. The data obtained at the wave flume of Ghent University, together with the data from the EsflOWC tests at the wave flume of LABIMA, University of Florence, provide a database for numerical validation of research on floating OWC WECs and floating OWC WEC farms or arrays used by researchers worldwide.

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“…Based on similar studies on the OWEC (e.g., [33]) and the OWC (e.g., [34]) technologies, and considering the physical limitations of the wave basin, the 2D physical model of the hybrid module was conceived and built at a 1/50 geometrical scale. Mitigation of scale effects associated with an incomplete hydraulic similitude was also taken into account as well as the logistical challenges inherent to incorporating an OWC and an OWEC hybrid WEC in a geometrically limited and already defined breakwater structure.…”

Section: Equipment and Experimental Facilitymentioning

confidence: 99%

Experimental Study of a Hybrid Wave Energy Converter Integrated in a Harbor Breakwater

Rosa-Santos

Taveira-Pinto

Clemente

et al. 2019

JMSE

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Sea ports are infrastructures with substantial energy demands and often responsible for air pollution and other environmental problems, which may be minimized by using renewable energy, namely electricity harvested from ocean waves. In this regard, a wide variety of concepts to harvest wave energy are available and some shoreline technologies are already in an advanced development phase. The SE@PORTS project aims to assess the suitability and viability of existing wave energy conversion technologies to be integrated in harbor breakwaters, in order to take advantage of their high exposure to ocean waves. This paper describes the experimental study carried out to assess the performance of a hybrid wave energy converter (WEC) integrated in the rubble-mound structure that was proposed for the extension of the North breakwater of the Port of Leixões, Portugal. The hybrid concept combines the overtopping and the oscillating water column principles and was tested on a geometric scale of 1/50. This paper is focused on the assessment of the effects of the hybrid WEC integration on the case-study breakwater, both in terms of its stability and functionality. The 2D physical model included the reproduction of the seabed bathymetry in front of the breakwater and the generation of a wide range of irregular sea states, including extreme wave conditions. The experimental results shown that the integration of the hybrid WEC in the breakwater does not worsens the stability of its toe berm blocks and reduces the magnitude of the overtopping events. The conclusions obtained are therefore favorable to the integration of this type of devices on harbor breakwaters.

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Optimization of the geometry and the turbine induced damping for fixed detached and asymmetric OWC devices: A numerical study

Cited by 78 publications

References 40 publications

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures

Efficiency and Survivability of a Floating Oscillating Water Column Wave Energy Converter Moored to the Seabed: An Overview of the EsflOWC MaRINET2 Database

Experimental Study of a Hybrid Wave Energy Converter Integrated in a Harbor Breakwater

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