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Journal articles on the topic 'Oscillating Surge Wave Energy Converter (OSWEC)'

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Published: 17 June 2021
Last updated: 17 February 2022

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1

Balitsky, Philip, Nicolas Quartier, Gael Verao Fernandez, Vasiliki Stratigaki, and Peter Troch. "Analyzing the Near-Field Effects and the Power Production of an Array of Heaving Cylindrical WECs and OSWECs Using a Coupled Hydrodynamic-PTO Model." Energies 11, no. 12 (2018): 3489. http://dx.doi.org/10.3390/en11123489.

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The Power Take-Off (PTO) system is the key component of a Wave Energy Converter (WEC) that distinguishes it from a simple floating body because the uptake of the energy by the PTO system modifies the wave field surrounding the WEC. Consequently, the choice of a proper PTO model of a WEC is a key factor in the accuracy of a numerical model that serves to validate the economic impact of a wave energy project. Simultaneously, the given numerical model needs to simulate many WEC units operating in close proximity in a WEC farm, as such conglomerations are seen by the wave energy industry as the path to economic viability. A balance must therefore be struck between an accurate PTO model and the numerical cost of running it for various WEC farm configurations to test the viability of any given WEC farm project. Because hydrodynamic interaction between the WECs in a farm modifies the incoming wave field, both the power output of a WEC farm and the surface elevations in the ‘near field’ area will be affected. For certain types of WECs, namely heaving cylindrical WECs, the PTO system strongly modifies the motion of the WECs. Consequently, the choice of a PTO system affects both the power production and the surface elevations in the ‘near field’ of a WEC farm. In this paper, we investigate the effect of a PTO system for a small wave farm that we term ‘WEC array’ of 5 WECs of two types: a heaving cylindrical WEC and an Oscillating Surge Wave Energy Converter (OSWEC). These WECs are positioned in a staggered array configuration designed to extract the maximum power from the incident waves. The PTO system is modelled in WEC-Sim, a purpose-built WEC dynamics simulator. The PTO system is coupled to the open-source wave structure interaction solver NEMOH to calculate the average wave field η in the ‘near-field’. Using a WEC-specific novel PTO system model, the effect of a hydraulic PTO system on the WEC array power production and the near-field is compared to that of a linear PTO system. Results are given for a series of regular wave conditions for a single WEC and subsequently extended to a 5-WEC array. We demonstrate the quantitative and qualitative differences in the power and the ‘near-field’ effects between a 5-heaving cylindrical WEC array and a 5-OSWEC array. Furthermore, we show that modeling a hydraulic PTO system as a linear PTO system in the case of a heaving cylindrical WEC leads to considerable inaccuracies in the calculation of average absorbed power, but not in the near-field surface elevations. Yet, in the case of an OSWEC, a hydraulic PTO system cannot be reduced to a linear PTO coefficient without introducing substantial inaccuracies into both the array power output and the near-field effects. We discuss the implications of our results compared to previous research on WEC arrays which used simplified linear coefficients as a proxy for PTO systems.
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2

Li, Qiaofeng, Jia Mi, Xiaofan Li, Shuo Chen, Boxi Jiang, and Lei Zuo. "A self-floating oscillating surge wave energy converter." Energy 230 (September 2021): 120668. http://dx.doi.org/10.1016/j.energy.2021.120668.

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3

Apolonia, Maria, and Teresa Simas. "Life Cycle Assessment of an Oscillating Wave Surge Energy Converter." Journal of Marine Science and Engineering 9, no. 2 (2021): 206. http://dx.doi.org/10.3390/jmse9020206.

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So far, very few studies have focused on the quantification of the environmental impacts of a wave energy converter. The current study presents a preliminary Life Cycle Assessment (LCA) of the MegaRoller wave energy converter, aiming to contribute to decision making regarding the least carbon- and energy-intensive design choices. The LCA encompasses all life cycle stages from “cradle-to-grave” for the wave energy converter, including the panel, foundation, PTO and mooring system, considering its deployment in Peniche, Portugal. Background data was mainly sourced from the manufacturer whereas foreground data was sourced from the Ecoinvent database (v.3.4). The resulting impact assessment of the MegaRoller is aligned with all previous studies in concluding that the main environmental impacts are due to materials use and manufacture, and mainly due to high amounts of material used, particularly steel. The scenario analysis showed that a reduction of the environmental impacts in the final design of the MegaRoller wave energy converter could potentially lie in reducing the quantity of steel by studying alternatives for its replacement. Results are generally comparable with earlier studies for ocean technologies and are very low when compared with other power generating technologies.
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4

Balitsky, Philip, Nicolas Quartier, Vasiliki Stratigaki, Gael Verao Fernandez, Panagiotis Vasarmidis, and Peter Troch. "Analysing the Near-Field Effects and the Power Production of Near-Shore WEC Array Using a New Wave-to-Wire Model." Water 11, no. 6 (2019): 1137. http://dx.doi.org/10.3390/w11061137.

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In this study, a series of modules is integrated into a wave-to-wire (W2W) model that links a Boundary Element Method (BEM) solver to a Wave Energy Converter (WEC) motion solver which are in turn coupled to a wave propagation model. The hydrodynamics of the WECs are resolved in the wave structure interaction solver NEMOH, the Power Take-off (PTO) is simulated in the WEC simulation tool WEC-Sim, and the resulting perturbed wave field is coupled to the mild-slope propagation model MILDwave. The W2W model is run for verified for a realistic wave energy project consisting of a WEC farm composed of 10 5-WEC arrays of Oscillating Surging Wave Energy Converters (OSWECs). The investigated WEC farm is modelled for a real wave climate and a sloping bathymetry based on a proposed OSWEC array project off the coast of Bretagne, France. Each WEC array is arranged in a power-maximizing 2-row configuration that also minimizes the inter-array separation distance d x and d y and the arrays are located in a staggered energy maximizing configuration that also decreases the along-shore WEC farm extent. The WEC farm power output and the near and far-field effects are simulated for irregular waves with various significant wave heights wave peak periods and mean wave incidence directions β based on the modelled site wave climatology. The PTO system of each WEC in each farm is modelled as a closed-circuit hydraulic PTO system optimized for each set of incident wave conditions, mimicking the proposed site technology, namely the WaveRoller® OSWEC developed by AW Energy Ltd. The investigation in this study provides a proof of concept of the proposed W2W model in investigating potential commercial WEC projects.
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5

Tom, N. M., M. J. Lawson, Y. H. Yu, and A. D. Wright. "Development of a nearshore oscillating surge wave energy converter with variable geometry." Renewable Energy 96 (October 2016): 410–24. http://dx.doi.org/10.1016/j.renene.2016.04.016.

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6

Tom, Nathan, Michael Lawson, Yi-Hsiang Yu, and Alan Wright. "Spectral modeling of an oscillating surge wave energy converter with control surfaces." Applied Ocean Research 56 (March 2016): 143–56. http://dx.doi.org/10.1016/j.apor.2016.01.006.

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7

Benites-Munoz, Daniela, Luofeng Huang, Enrico Anderlini, José R. Marín-Lopez, and Giles Thomas. "Hydrodynamic Modelling of An Oscillating Wave Surge Converter Including Power Take-Off." Journal of Marine Science and Engineering 8, no. 10 (2020): 771. http://dx.doi.org/10.3390/jmse8100771.

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To estimate the response of wave energy converters to different sea environments accurately is an ongoing challenge for researchers and industry, considering that there has to be a balance between guaranteeing their integrity whilst extracting the wave energy efficiently. For oscillating wave surge converters, the incident wave field is changed due to the pitching motion of the flap structure. A key component influencing this motion response is the Power Take-Off system used. Based on OpenFOAM, this paper includes the Power Take-off to establish a realistic model to simulate the operation of a three-dimensional oscillating wave surge converter by solving Reynolds Averaged Navier-Stokes equations. It examines the relationship between incident waves and the perturbed fluid field near the flap, which is of great importance when performing in arrays as neighbouring devices may influence each other. Furthermore, it investigates the influence of different control strategy systems (active and passive) in the energy extracted from regular waves related to the performance of the device. This system is estimated for each wave frequency considered and the results show the efficiency of the energy extracted from the waves is related to high amplitude pitching motions of the device in short periods of time.
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8

Liu, Zhenqing, Yize Wang, and Xugang Hua. "Prediction and optimization of oscillating wave surge converter using machine learning techniques." Energy Conversion and Management 210 (April 2020): 112677. http://dx.doi.org/10.1016/j.enconman.2020.112677.

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9

Cheng, Yong, Chen Xi, Saishuai Dai, Chunyan Ji, and Margot Cocard. "Wave energy extraction for an array of dual-oscillating wave surge converter with different layouts." Applied Energy 292 (June 2021): 116899. http://dx.doi.org/10.1016/j.apenergy.2021.116899.

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10

Choiniere, Michael A., Nathan M. Tom, and Krish P. Thiagarajan. "Load shedding characteristics of an oscillating surge wave energy converter with variable geometry." Ocean Engineering 186 (August 2019): 105982. http://dx.doi.org/10.1016/j.oceaneng.2019.04.063.

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11

Calvário, M., J. F. Gaspar, M. Kamarlouei, T. S. Hallak, and C. Guedes Soares. "Oil-hydraulic power take-off concept for an oscillating wave surge converter." Renewable Energy 159 (October 2020): 1297–309. http://dx.doi.org/10.1016/j.renene.2020.06.002.

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12

Gunawardane, S. D. G. S. P., M. Folley, and C. J. Kankanamge. "Analysis of the hydrodynamics of four different oscillating wave surge converter concepts." Renewable Energy 130 (January 2019): 843–52. http://dx.doi.org/10.1016/j.renene.2018.06.115.

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13

Brito, M., R. B. Canelas, O. García-Feal, et al. "A numerical tool for modelling oscillating wave surge converter with nonlinear mechanical constraints." Renewable Energy 146 (February 2020): 2024–43. http://dx.doi.org/10.1016/j.renene.2019.08.034.

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14

Pols, Alana, Eric Gubesch, Nagi Abdussamie, Irene Penesis, and Christopher Chin. "Mooring Analysis of a Floating OWC Wave Energy Converter." Journal of Marine Science and Engineering 9, no. 2 (2021): 228. http://dx.doi.org/10.3390/jmse9020228.

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This investigation focuses on the modelling of a floating oscillating water column (FOWC) wave energy converter with a numerical code (ANSYS AQWA) based on potential flow theory. Free-floating motions predicted by the numerical model were validated against experimental data extrapolated from a 1:36 scale model device in regular and irregular sea states. Upon validation, an assessment of the device’s motions when dynamically coupled with a four-line catenary mooring arrangement was conducted at different incident wave angles and sea states ranging from operational to survivable conditions, including the simulation of the failure of a single mooring line. The lack of viscosity in the numerical modelling led to overpredicted motions in the vicinity of the resonant frequencies; however, the addition of an external linear damping coefficient was shown to be an acceptable method of mitigating these discrepancies. The incident wave angle was found to have a limited influence on the magnitudes of heave, pitch, and surge motions. Furthermore, the obtained results indicated that the mooring restoring force is controlled by the forward mooring lines under the tested conditions.
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15

Magkouris, Alexandros, Markos Bonovas, and Kostas Belibassakis. "Hydrodynamic Analysis of Surge-Type Wave Energy Devices in Variable Bathymetry by Means of BEM." Fluids 5, no. 2 (2020): 99. http://dx.doi.org/10.3390/fluids5020099.

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A variety of devices and concepts have been proposed and thoroughly investigated for the exploitation of renewable wave energy. Many of the devices operate in nearshore and coastal regions, and thus, variable bathymetry could have significant effects on their performance. In particular, Oscillating Wave Surge Converters (OWSCs) exploit the horizontal motion of water waves interacting with the flap of the device. In this work, a Boundary Element Method (BEM) is developed, and applied to the investigation of variable bathymetry effects on the performance of a simplified 2D model of a surge-type wave energy converter excited by harmonic incident waves. Numerical results, illustrating the effects of depth variation in conjunction with other parameters, like inertia and power-take-off, on the performance of the device, are presented. Finally, a comparative evaluation of the present simplified surge-type WEC model and point absorbers is presented for a case study in a selected coastal site on the Greek nearshore area, characterized by relatively increased wave energy potential.
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16

Brito, Moisés, Rui M. L. Ferreira, Luis Teixeira, Maria G. Neves, and Ricardo B. Canelas. "Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves." Renewable Energy 151 (May 2020): 975–92. http://dx.doi.org/10.1016/j.renene.2019.11.094.

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17

Mottahedi, H. R., M. Anbarsooz, and M. Passandideh-Fard. "Application of a fictitious domain method in numerical simulation of an oscillating wave surge converter." Renewable Energy 121 (June 2018): 133–45. http://dx.doi.org/10.1016/j.renene.2018.01.021.

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18

Heikkilä, Eetu, Tero Välisalo, Risto Tiusanen, Janne Sarsama, and Minna Räikkönen. "Reliability Modelling and Analysis of the Power Take-Off System of an Oscillating Wave Surge Converter." Journal of Marine Science and Engineering 9, no. 5 (2021): 552. http://dx.doi.org/10.3390/jmse9050552.

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Wave power is a potential technology for generating sustainable renewable energy. Several types of wave energy converters (WECs) have been proposed for this purpose. WECs operate in a harsh maritime environment that sets strict limitations on how and when the device can be economically and safely reached for maintenance. Thus, to ensure profitable energy generation over the system life cycle, system reliability is a key aspect to be considered in WEC development. In this article, we describe a reliability analysis approach for WEC development, based on the use of reliability block diagram (RBD) modelling. We apply the approach in a case study involving a submerged oscillating wave surge converter device concept that utilizes hydraulics in its power take-off system. In addition to describing the modelling approach, we discuss the data sources that were used for gathering reliability data for the components used in a novel system concept with very limited historical or experimental data available. This includes considerations of the data quality from various sources. As a result, we present examples of applying the RBD modelling approach in the context of WEC development and discuss the applicability of the approach in supporting the development of new technologies.
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19

Michele, Simone, Paolo Sammarco, and Michele d’Errico. "Theory of the synchronous motion of an array of floating flap gates oscillating wave surge converter." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2192 (2016): 20160174. http://dx.doi.org/10.1098/rspa.2016.0174.

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We consider a finite array of floating flap gates oscillating wave surge converter (OWSC) in water of constant depth. The diffraction and radiation potentials are solved in terms of elliptical coordinates and Mathieu functions. Generated power and capture width ratio of a single gate excited by incoming waves are given in terms of the radiated wave amplitude in the far field. Similar to the case of axially symmetric absorbers, the maximum power extracted is shown to be directly proportional to the incident wave characteristics: energy flux, angle of incidence and wavelength. Accordingly, the capture width ratio is directly proportional to the wavelength, thus giving a design estimate of the maximum efficiency of the system. We then compare the array and the single gate in terms of energy production. For regular waves, we show that excitation of the out-of-phase natural modes of the array increases the power output, while in the case of random seas we show that the array and the single gate achieve the same efficiency.
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20

Ruehl, Kelley, Dominic D. Forbush, Yi-Hsiang Yu, and Nathan Tom. "Experimental and numerical comparisons of a dual-flap floating oscillating surge wave energy converter in regular waves." Ocean Engineering 196 (January 2020): 106575. http://dx.doi.org/10.1016/j.oceaneng.2019.106575.

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21

Farrok, Omar, Koushik Ahmed, Abdirazak Dahir Tahlil, Mohamud Mohamed Farah, Mahbubur Rahman Kiran, and Md Rabiul Islam. "Electrical Power Generation from the Oceanic Wave for Sustainable Advancement in Renewable Energy Technologies." Sustainability 12, no. 6 (2020): 2178. http://dx.doi.org/10.3390/su12062178.

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Recently, electrical power generation from oceanic waves is becoming very popular, as it is prospective, predictable, and highly available compared to other conventional renewable energy resources. In this paper, various types of nearshore, onshore, and offshore wave energy devices, including their construction and working principle, are explained explicitly. They include point absorber, overtopping devices, oscillating water column, attenuators, oscillating wave surge converters, submerged pressure differential, rotating mass, and bulge wave converter devices. The encounters and obstacles of electrical power generation from the oceanic wave are discussed in detail. The electrical power generation methods of the generators involved in wave energy devices are depicted. In addition, the vital control technologies in wave energy converters and devices are described for different cases. At present, piezoelectric materials are also being implemented in the design of wave energy converters as they convert mechanical motion directly into electrical power. For this reason, various models of piezoelectric material-based wave energy devices are illustrated. The statistical reports and extensive literature survey presented in this review show that there is huge potential for oceanic wave energy. Therefore, it is a highly prospective branch of renewable energy, which would play a significant role in the near future.
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22

Cheng, Yong, Gen Li, Chunyan Ji, Tianhui Fan, and Gangjun Zhai. "Fully nonlinear investigations on performance of an OWSC (oscillating wave surge converter) in 3D (three-dimensional) open water." Energy 210 (November 2020): 118526. http://dx.doi.org/10.1016/j.energy.2020.118526.

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23

Wang, Yize, and Zhenqing Liu. "Proposal of novel analytical wake model and GPU-accelerated array optimization method for oscillating wave surge energy converter." Renewable Energy 179 (December 2021): 563–83. http://dx.doi.org/10.1016/j.renene.2021.07.054.

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24

QIAN, LING, CLIVE MINGHAM, DEREK CAUSON, DAVID INGRAM, MATT FOLLEY, and TREVOR WHITTAKER. "NUMERICAL SIMULATION OF WAVE POWER DEVICES USING A TWO-FLUID FREE SURFACE SOLVER." Modern Physics Letters B 19, no. 28n29 (2005): 1479–82. http://dx.doi.org/10.1142/s0217984905009705.

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A generic two-fluid (water/air) numerical model has been developed and applied for the simulation of the complex fluid flow around a wave driven rotating vane near a shoreline in the context of a novel wave energy device OWSC (Oscillating wave surge converter). The underlying scheme is based on the solution of the incompressible Euler equations for a variable density fluid system for automatically capturing the interface between water and air and the Cartesian cut cell method for tracking moving solid boundaries on a background stationary Cartesian grid. The results from the present study indicate that the method is an effective tool for modeling a wide range of free surface flow problems.
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25

Cheng, Yong, Chunyan Ji, and Gangjun Zhai. "Fully nonlinear analysis incorporating viscous effects for hydrodynamics of an oscillating wave surge converter with nonlinear power take-off system." Energy 179 (July 2019): 1067–81. http://dx.doi.org/10.1016/j.energy.2019.04.189.

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26

Tom, N. M., Y. H. Yu, A. D. Wright, and M. J. Lawson. "Pseudo-spectral control of a novel oscillating surge wave energy converter in regular waves for power optimization including load reduction." Ocean Engineering 137 (June 2017): 352–66. http://dx.doi.org/10.1016/j.oceaneng.2017.03.027.

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27

Falnes, Johannes, and Jørgen Hals. "Heaving buoys, point absorbers and arrays." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1959 (2012): 246–77. http://dx.doi.org/10.1098/rsta.2011.0249.

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Absorption of wave energy may be considered as a phenomenon of interference between incident and radiated waves generated by an oscillating object; a wave-energy converter (WEC) that displaces water. If a WEC is very small in comparison with one wavelength, it is classified as a point absorber (PA); otherwise, as a ‘quasi-point absorber’. The latter may be a dipole-mode radiator, for instance an immersed body oscillating in the surge mode or pitch mode, while a PA is so small that it should preferably be a source-mode radiator, for instance a heaving semi-submerged buoy. The power take-off capacity, the WEC's maximum swept volume and preferably also its full physical volume should be reasonably matched to the wave climate. To discuss this matter, two different upper bounds for absorbed power are applied in a ‘Budal diagram’. It appears that, for a single WEC unit, a power capacity of only about 0.3 MW matches well to a typical offshore wave climate, and the full physical volume has, unfortunately, to be significantly larger than the swept volume, unless phase control is used. An example of a phase-controlled PA is presented. For a sizeable wave-power plant, an array consisting of hundreds, or even thousands, of mass-produced WEC units is required.
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Verao Fernandez, Gael, Vasiliki Stratigaki, Panagiotis Vasarmidis, Philip Balitsky, and Peter Troch. "Wake Effect Assessment in Long- and Short-Crested Seas of Heaving-Point Absorber and Oscillating Wave Surge WEC Arrays." Water 11, no. 6 (2019): 1126. http://dx.doi.org/10.3390/w11061126.

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In the recent years, the potential impact of wave energy converter (WEC) arrays on the surrounding wave field has been studied using both phase-averaging and phase-resolving wave propagation models. Obtaining understanding of this impact is important because it may affect other users in the sea or on the coastline. However, in these models a parametrization of the WEC power absorption is often adopted. This may lead to an overestimation or underestimation of the overall WEC array power absorption, and thus to an unrealistic estimation of the potential WEC array impact. WEC array power absorption is a result of energy extraction from the incoming waves, and thus wave height decrease is generally observed downwave at large distances (the so-called “wake” or “far-field” effects). Moreover, the power absorption depends on the mutual interactions between the WECs of an array (the so-called “near field” effects). To deal with the limitations posed by wave propagation models, coupled models of recent years, which are nesting wave-structure interaction solvers into wave propagation models, have been used. Wave-structure interaction solvers can generally provide detailed hydrodynamic information around the WECs and a more realistic representation of wave power absorption. Coupled models have shown a lower WEC array impact in terms of wake effects compared to wave propagation models. However, all studies to date in which coupled models are employed have been performed using idealized long-crested waves. Ocean waves propagate with a certain directional spreading that affects the redistribution of wave energy in the lee of WEC arrays, and thus gaining insight wake effect for irregular short-crested sea states is crucial. In our research, a new methodology is introduced for the assessment of WEC array wake effects for realistic sea states. A coupled model is developed between the wave-structure interaction solver NEMOH and the wave propagation model MILDwave. A parametric study is performed showing a comparison between WEC array wake effects for regular, long-crested irregular, and short-crested irregular waves. For this investigation, a nine heaving-point absorber array is used for which the wave height reduction is found to be up to 8% lower at 1.0 km downwave the WEC array when changing from long-crested to short-crested irregular waves. Also, an oscillating wave surge WEC array is simulated and the overestimation of the wake effects in this case is up to 5%. These differences in wake effects between different wave types indicates the need to consider short-crested irregular waves to avoid overestimating the WEC array potential impacts. The MILDwave-NEMOH coupled model has proven to be a reliable numerical tool, with an efficient computational effort for simulating the wake effects of two different WEC arrays under the action of a range of different sea states.
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Yu, Yi-Hsiang, and Dale Jenne. "Numerical Modeling and Dynamic Analysis of a Wave-Powered Reverse-Osmosis System." Journal of Marine Science and Engineering 6, no. 4 (2018): 132. http://dx.doi.org/10.3390/jmse6040132.

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A wave energy converter (WEC) system has the potential to convert the wave energy resource directly into the high-pressure flow that is needed by the desalination system to pump saltwater to the reverse-osmosis membrane and provide the required pressure level to generate freshwater. In this study, a wave-to-water numerical model was developed to investigate the potential use of a wave-powered desalination system (WPDS) for water production. The model was developed by coupling a time-domain radiation-and-diffraction method-based numerical tool (WEC-Sim) for predicting the hydrodynamic performance of WECs with a solution-diffusion model that was used to simulate the reverse-osmosis (RO) process. The objective of this research is to evaluate the WPDS dynamics and the overall efficiency of the system. To evaluate the feasibility of the WPDS, the wave-to-water numerical model was applied to simulate a desalination system that used an oscillating surge WEC device to pump seawater through the system. The hydrodynamics WEC-Sim simulation results for the oscillating surge WEC device were validated against existing experimental data. The RO simulation was verified by comparing the results to those from the Dow Chemical Company’s reverse osmosis system analysis (ROSA) model, which has been widely used to design and simulate RO systems. The wave-to-water model was then used to analyze the WPDS under a range of wave conditions and for a two-WECs-coupled RO system to evaluate the influence of pressure and flow rate fluctuation on the WPDS performance. The results show that the instantaneous energy fluctuation from waves has a significant influence on the responding hydraulic pressure and flow rate, as well as the recovery ratio and, ultimately, the water-production quality. Nevertheless, it is possible to reduce the hydraulic fluctuation for different sea states while maintaining a certain level of freshwater production, and a WEC array that produces water can be a viable, near-term solution to the nation’s water supply. A discussion on the dynamic impact of hydraulic fluctuation on the WPDS performance and potential options to reduce the fluctuation and their trade-offs is also presented.
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30

Hillis, A. J., N. P. Sell, D. R. S. Chandel, and A. R. Plummer. "Control of the CCell Oscillating Surge Wave Energy Converter * *This research is supported by EPSRC/Innovate UK under grant EP/N508445/1 and the Wave Energy Scotland Novel WEC competition." IFAC-PapersOnLine 50, no. 1 (2017): 14686–91. http://dx.doi.org/10.1016/j.ifacol.2017.08.2498.

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31

Scriven, Joshua, P. Laporte-Weywada, and J. Cruz. "Introducing non-rigid body structural dynamics to WEC-Sim." International Marine Energy Journal 3, no. 2 (2020): 55–63. http://dx.doi.org/10.36688/imej.3.55-63.

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This paper describes the development of a structural dynamics add-on to WEC-Sim, an open-source code dedicated to the dynamic analysis of Wave Energy Converters (WECs). When calculating the dynamic response of a body, WEC-Sim by default uses a rigid body dynamics approach. Such an approach ignores the potential effects of structural deformation on the WEC, which can in turn affect e.g. the distributed loads across the WEC and / or the individual (point) load sources that depend on the dynamic response of the WEC. Following a similar approach to tools used in the offshore wind industry, a structural dynamic add-on was developed using Code_Aster as the Finite Element (FE) solver to enable coupled hydro-elastic, time-domain analysis. The add-on was developed and tested using an example Oscillating Wave Surge Converter (OWSC) WEC model, currently being developed as part of the H2020 MegaRoller project. In the examples studied, the inclusion of structural dynamics is shown to affect the estimated peak Power Take-Off (PTO) loads, with variations in PTO force of over 10% being observed when structural dynamics are considered in the analysis.
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32

Choiniere, Michael, Jacob Davis, Nhu Nguyen, Nathan Tom, Matthew Fowler, and Krish Thiagarajan Sharman. "Hydrodynamics and Load Shedding Behavior of a Variable Geometry Oscillating Surge Wave Energy Converter (OSWEC)." SSRN Electronic Journal, 2021. http://dx.doi.org/10.2139/ssrn.3900951.

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33

Kelly, Michael, Nathan Tom, Yi-Hsiang Yu, Alan Wright, and Michael Lawson. "Annual Performance of the Second-Generation Variable-Geometry Oscillating Surge Wave Energy Converter." Renewable Energy, November 2020. http://dx.doi.org/10.1016/j.renene.2020.11.075.

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34

Boualia, Yasmine, Nadji CHIOUKH, Benameur Hamoudi, and Yalçın Yuksel. "Hydrodynamic Characteristics of a Wave Energy Converter of Dual Vertical Porous Plates Oscillating in Surge." International Journal of Fluid Mechanics Research, 2021. http://dx.doi.org/10.1615/interjfluidmechres.2021037408.

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35

Nguyen, H. P., and C. M. Wang. "Oscillating Wave Surge Converter-Type Attachment for Extracting Wave Energy While Reducing Hydroelastic Responses of Very Large Floating Structures." Journal of Offshore Mechanics and Arctic Engineering 142, no. 4 (2020). http://dx.doi.org/10.1115/1.4045916.

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Abstract This paper presents an oscillating wave surge converter (OWSC)-type attachment, comprising a submerged vertical flap connected to the fore edge of a very large floating structure (VLFS) with hinges and linear power take-off (PTO) systems, for extracting wave energy while reducing hydroelastic responses of VLFS. In terms of reductions in hydroelastic responses of VLFS, the OWSC-type attachment is better than the recently proposed raft wave energy converter (WEC)-type attachment for relatively short waves (T < 7 s) and better than the conventional anti-motion device comprising a submerged vertical flap rigidly connected to the fore edge of VLFS for all wave periods. Importantly, the horizontal wave force acting on the submerged flap for the OWSC-type attachment is smaller than that for the conventional anti-motion device, leading to a more economical mooring system. In terms of wave energy extraction, the OWSC-type attachment is better than the raft WEC-type attachment for intermediate and long waves (T ≥ 7 s). In addition, for maximizing power production, the required flap length for the OWSC-type attachment is much smaller than the required pontoon length for the raft WEC-type attachment (about λ/10 as compared to about λ/3, where λ is the incident wavelength).
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36

Vargas, Guilherme Fuhrmeister, and Edith Beatriz Camaño Schettini. "Application of an alternative mesh morphing method on the numerical modeling of oscillating wave surge converters." RBRH 24 (2019). http://dx.doi.org/10.1590/2318-0331.241920180102.

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ABSTRACT A technology capable of converting the horizontal motion of the ocean waves into energy by the application of a flap-piston system has been improved over the last few years, this device is known as oscillating wave surge converter. This system has great potential, already proven, for electric power generation. The computational fluid dynamics is one of the most used tools for the study of wave energy converters. In this context, the present paper proposes the application of an alternative mesh morphing method to represent the hydrodynamics of these devices, which is based on a bottom that oscillates with the converter, leading the flap to reach high inclinations without causing numerical divergences. The study is performed using the OpenFOAM computational code and its extension OLAFOAM. These are based on Reynolds Average Navier Stokes (RANS) turbulence modeling and the Volume of Fluid method (VOF) for the free surface representation, which are applied to a bidimensional model, allowing the numerical modeling of the converter. The proposed method presented good agreement of the results when compared to the experimental studies in similar hydrodynamic cases. The methodology based on a moving bottom presented relative differences, concerning the method that considers the bottom as fixed, between 4% and 17% for the cases where the flap is near to the ocean bottom and up to 8% for cases where it is further away.
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37

Jaswar, Jaswar, C. L. Siow, A. Maimun, and C. Guedes Soares. "Estimation of Electrical-Wave Power in Merang Shore, Terengganu, Malaysia." Jurnal Teknologi 66, no. 2 (2014). http://dx.doi.org/10.11113/jt.v66.2476.

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Malaysian government introduced Small Renewable Energy Power (SREP) Program such as biomass, biogas, and municipal solid waste, solar photovoltaic and mini-hydroelectric facilities in 2001. In year 2010, the energy generated by biomass was achieved 18 MW and mini hydro also successes to generate around 23 MW. Green Technology and Water Malaysia are targeted by Ministry of Energy to achieve cumulative renewable energy capacity around 2080 MW at year 2020 and 21.4 GW at year 2050. This paper discusses the possibility to utilize ocean wave in Merang shore, Terengganu, Malaysia. The literature reviewed available technologies used to convert wave energy to electricity which are developing currently. The available technologies reviewed here are attenuator, overtopper, point absorbers, oscillating wave surge converter and oscillating water column. The work principle of the device was covered. Finally, the sea condition in Malaysia also studied to analyze the possibility to utilize the wave energy by using the available technologies. It is found that the mean wave height is 0.95 meter and the mean wave period is 3.5 second in the Merang shore, Terengganu, Malaysia. Attenuator type wave converter developed by Wave Star is considered as one of the possible devices to be installed at the location. From the calculation, it is obtained that the total rate electrical power possible to grid is 649 MWh a year if only one set of C5 Wave star device is installed on Merang shore, Terengganu.
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