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Towards a practical resource assessment of the extractable energy in the Agulhas ocean current 对阿古拉斯海流中可提取能源的实际资源评估
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-05-25 DOI: 10.1016/j.ijome.2016.05.010
Imke Meyer, Johannes Lodewikus Van Niekerk
{"title":"Towards a practical resource assessment of the extractable energy in the Agulhas ocean current","authors":"Imke Meyer,&nbsp;Johannes Lodewikus Van Niekerk","doi":"10.1016/j.ijome.2016.05.010","DOIUrl":"https://doi.org/10.1016/j.ijome.2016.05.010","url":null,"abstract":"<div><p>In a found region of energetic flow in the Agulhas Current, two locations are analysed. It is found that the current core borders on the mid-shelf (91<!--> <!-->m depth) location and off-shore (255<!--> <!-->m depth) location lies within its predominant path, with mean velocities of 1.34<!--> <!-->m/s and 1.59<!--> <!-->m/s respectively at a 30<!--> <!-->m depth. In the period analysed only one large meander is noted at a depth of 30<!--> <!-->m. The percentage current reversals are 4.1% and 3.1% at the mid-self and off-shore locations, respectively.</p><p>The most suited developed technology found to potentially deploy in this current is Minesto Deep Green turbine. The found capacity factor and specific yield for one Minesto (DG-12) 500<!--> <!-->kW turbine at 30<!--> <!-->m depth is estimated to be 62% with (4886<!--> <!-->kWh/year)/kW for the mid-shelf location and 76% with 5416<!--> <!-->(kWh/year)/kW for the off-shore location. Through a simplified analysis, the capacity credit of a possible 2000<!--> <!-->MW array is analysed. It is found that an ocean current power plant can add to the load carrying capacity of the country and outperforms onshore wind power plants in this respect. The largest barriers at present are the cost and mooring challenges which presents a need for a detailed economic assessment to determine if associated costs of working in deeper waters (off-shore site) are justified.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 116-132"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.05.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Comparative turbulent three-dimensional Navier–Stokes hydrodynamic analysis and performance assessment of oscillating wings for renewable energy applications 可再生能源应用中振荡翼的比较湍流三维Navier-Stokes水动力分析和性能评估
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-05-21 DOI: 10.1016/j.ijome.2016.05.009
Jernej Drofelnik , M. Sergio Campobasso
{"title":"Comparative turbulent three-dimensional Navier–Stokes hydrodynamic analysis and performance assessment of oscillating wings for renewable energy applications","authors":"Jernej Drofelnik ,&nbsp;M. Sergio Campobasso","doi":"10.1016/j.ijome.2016.05.009","DOIUrl":"https://doi.org/10.1016/j.ijome.2016.05.009","url":null,"abstract":"<div><p>Oscillating wings can extract energy from an oncoming water or air stream, and first large-scale marine demonstrators are being tested. Oscillating wing hydrodynamics is highly unsteady, may feature dynamic stall and leading edge vortex shedding, and is significantly three-dimensional due to finite-wing effects. Understanding the interaction of these phenomena is essential for maximizing power generation efficiency. Much of the knowledge on oscillating wing hydrodynamics stemmed from two-dimensional low-Reynolds number computational fluid dynamics studies and laboratory testing; real installations, however, will feature Reynolds numbers higher than 1 million and unavoidable finite-wing-induced losses. This study investigates the impact of flow three-dimensionality on the hydrodynamics and the efficiency of a realistic aspect ratio 10 device in a stream with Reynolds number of 1.5 million. The improvements achievable by using endplates to reduce finite-wing-induced losses are also analyzed. Three-dimensional time-dependent Navier–Stokes simulations using the shear stress transport turbulence model and a 30-million-cell grid are performed. Detailed comparative hydrodynamic analyses of the finite and the infinite wings reveal that flow three-dimensionality reduces the power generation efficiency of the finite wing with sharp tips and that with endplates by about 17% and 12% respectively. Presented analyses suggest approaches to further reducing these power losses.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 100-115"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.05.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90126429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Towards a practical resource assessment of the extractable energy in the Agulhas ocean current 对阿古拉斯海流中可提取能源的实际资源评估
International Journal of Marine Energy Pub Date : 2016-12-01 DOI: 10.1016/J.IJOME.2016.05.010
I. Meyer, J. V. Niekerk
{"title":"Towards a practical resource assessment of the extractable energy in the Agulhas ocean current","authors":"I. Meyer, J. V. Niekerk","doi":"10.1016/J.IJOME.2016.05.010","DOIUrl":"https://doi.org/10.1016/J.IJOME.2016.05.010","url":null,"abstract":"","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"134 1","pages":"116-132"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78537801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
The location of offshore wave power devices structures epifaunal assemblages 近海波浪能装置的位置构成了海底组合
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-07-16 DOI: 10.1016/j.ijome.2016.07.007
Olivia Langhamer
{"title":"The location of offshore wave power devices structures epifaunal assemblages","authors":"Olivia Langhamer","doi":"10.1016/j.ijome.2016.07.007","DOIUrl":"https://doi.org/10.1016/j.ijome.2016.07.007","url":null,"abstract":"<div><p>With large-scale development of offshore wave power conversion, artificial structures become more common in the open sea. To examine how wave power devices may be colonized by epifaunal organisms, 21 concrete foundations used for anchoring wave power generators were studied during two years, 2007 and 2008. The foundations were placed in two different clusters, located north and south within the Lysekil test site at the Swedish west coast. The degree to which early recruits covered the foundations and the succession of epibenthic communities were documented during two years. A succession in colonization over time was observed, with a higher degree of cover in the northern location. Furthermore, the northern location showed an increase in number of individuals, number of species and in Shannon-Wiener diversity in 2008. Dominant organisms on the foundations were the serpulid tubeworms (<em>Pomatoceros triqueter</em>) and barnacles (<em>Balanus</em> sp.). This comprehensive large-scale study about succession and colonization patterns on wave power foundations suggests that the location of wave energy devices affects colonization patterns. This gives indications on settlement patterns on already operating and planned offshore wave power parks further off the coasts.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 174-180"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.07.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Coupled mooring analysis for floating wave energy converters using CFD: Formulation and validation 基于CFD的浮动波能转换器耦合系泊分析:公式与验证
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-05-10 DOI: 10.1016/j.ijome.2016.05.003
Johannes Palm , Claes Eskilsson , Guilherme Moura Paredes , Lars Bergdahl
{"title":"Coupled mooring analysis for floating wave energy converters using CFD: Formulation and validation","authors":"Johannes Palm ,&nbsp;Claes Eskilsson ,&nbsp;Guilherme Moura Paredes ,&nbsp;Lars Bergdahl","doi":"10.1016/j.ijome.2016.05.003","DOIUrl":"10.1016/j.ijome.2016.05.003","url":null,"abstract":"<div><p>Floating wave energy converters (WECs) operating in the resonance region are strongly affected by non-linearities arising from the interaction between the waves, the WEC motion and the mooring restraints. To compute the restrained WEC motion thus requires a method which readily accounts for these effects. This paper presents a method for coupled mooring analysis using a two-phase Navier–Stokes (VOF–RANS) model and a high-order finite element model of mooring cables. The method is validated against experimental measurements of a cylindrical buoy in regular waves, slack-moored with three catenary mooring cables. There is overall a good agreement between experimental and computational results with respect to buoy motions and mooring forces. Most importantly, the coupled numerical model accurately recreates the strong wave height dependence of the response amplitude operators seen in the experiments.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 83-99"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.05.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79490485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 101
Experimental validation of the distributed drag method for simulating large marine current turbine arrays using porous fences 多孔栅模拟大型海流涡轮阵列分布阻力方法的实验验证
International Journal of Marine Energy Pub Date : 2016-12-01 DOI: 10.1016/J.IJOME.2016.10.001
D. Coles, L. Blunden, A. Bahaj
{"title":"Experimental validation of the distributed drag method for simulating large marine current turbine arrays using porous fences","authors":"D. Coles, L. Blunden, A. Bahaj","doi":"10.1016/J.IJOME.2016.10.001","DOIUrl":"https://doi.org/10.1016/J.IJOME.2016.10.001","url":null,"abstract":"","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"43 1","pages":"298-316"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84233225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Optimal Wells turbine speeds at different wave conditions 不同波浪条件下井式水轮机的最佳转速
International Journal of Marine Energy Pub Date : 2016-12-01 DOI: 10.1016/J.IJOME.2016.05.008
Paresh Halder, A. Samad
{"title":"Optimal Wells turbine speeds at different wave conditions","authors":"Paresh Halder, A. Samad","doi":"10.1016/J.IJOME.2016.05.008","DOIUrl":"https://doi.org/10.1016/J.IJOME.2016.05.008","url":null,"abstract":"","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"487 3-4 1","pages":"133-149"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78133445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
Numerical prediction of the turbulent wakes generated by a row of marine turbines 一排船用涡轮机产生的湍流尾迹的数值预测
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-05-07 DOI: 10.1016/j.ijome.2016.05.004
Arturo Fernandez
{"title":"Numerical prediction of the turbulent wakes generated by a row of marine turbines","authors":"Arturo Fernandez","doi":"10.1016/j.ijome.2016.05.004","DOIUrl":"10.1016/j.ijome.2016.05.004","url":null,"abstract":"<div><p><span>Numerical simulations of the turbulent wakes generated by rows of up to five marine turbines are presented. The numerical scheme<span><span> combines an actuator disk model with a non-uniform </span>velocity distribution, and the solution to the Reynolds averaged Navier–Stokes (RANS) equations. The first computations examine the dynamics of the turbulent wakes when the stream flows perpendicular to the row. The experiments of Stallard et al. (2013) serve as the benchmark for the </span></span>numerical predictions<span>. The computations also explore the significance of turbulence intensity and yawed conditions. An increase in the ambient turbulent intensity results in a quicker wake recovery. When the fluid stream is yawed to the turbine row, the problem loses its symmetry and some turbines realize lower velocities as they become affected by the wakes generated by other turbines.</span></p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 41-50"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.05.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91505512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Comparative turbulent three-dimensional Navier–Stokes hydrodynamic analysis and performance assessment of oscillating wings for renewable energy applications 可再生能源应用中振荡翼的比较湍流三维Navier-Stokes水动力分析和性能评估
International Journal of Marine Energy Pub Date : 2016-12-01 DOI: 10.1016/J.IJOME.2016.05.009
J. Drofelnik, S. Campobasso
{"title":"Comparative turbulent three-dimensional Navier–Stokes hydrodynamic analysis and performance assessment of oscillating wings for renewable energy applications","authors":"J. Drofelnik, S. Campobasso","doi":"10.1016/J.IJOME.2016.05.009","DOIUrl":"https://doi.org/10.1016/J.IJOME.2016.05.009","url":null,"abstract":"","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"12 1","pages":"100-115"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84694337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Levelized cost of energy for a Backward Bent Duct Buoy 后弯管浮标的平准化能源成本
International Journal of Marine Energy Pub Date : 2016-12-01 Epub Date: 2016-07-18 DOI: 10.1016/j.ijome.2016.07.002
Diana Bull , D. Scott Jenne , Christopher S. Smith , Andrea E. Copping , Guild Copeland
{"title":"Levelized cost of energy for a Backward Bent Duct Buoy","authors":"Diana Bull ,&nbsp;D. Scott Jenne ,&nbsp;Christopher S. Smith ,&nbsp;Andrea E. Copping ,&nbsp;Guild Copeland","doi":"10.1016/j.ijome.2016.07.002","DOIUrl":"10.1016/j.ijome.2016.07.002","url":null,"abstract":"<div><p>The Reference Model Project, supported by the U.S. Department of Energy, was developed to provide publically available technical and economic benchmarks for a variety of marine energy converters. The methodology to achieve these benchmarks is to develop public domain designs that incorporate power performance estimates, structural models, anchor and mooring designs, power conversion chain designs, and estimates of the operations and maintenance, installation, and environmental permitting required. The reference model designs are intended to be conservative, robust, and experimentally verified. The Backward Bent Duct Buoy (BBDB) presented in this paper is one of three wave energy conversion devices studied within the Reference Model Project. Comprehensive modeling of the BBDB in a Northern California climate has enabled a full levelized cost of energy (LCOE) analysis to be completed on this device.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":"16 ","pages":"Pages 220-234"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2016.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88928315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
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