Stratigaki, Vicky

Troch, Peter

Verao Fernandez, Gael

English

Ghent University Academic Bibliography

                                                                                            COST is supported by the EU Framework Programme Horizon 2020. COST (European Cooperation in Science and Technology)  is a funding agency for research and innovation networks. COST Actions help connect research initiatives across Europe  and enable scientists to grow their ideas by sharing them with  their peers.     28Numerical benchmark study of “far field” effects of farms of WECs  using linear and weekly non-linear modelsGael Verao Fernandez1, Vasiliki Stratigaki1, Peter Troch11Civil Engineering, Ghent University, Technologiepark 60, 9052, Ghent, BelgiumE-mails: Gael.VeraoFernandez@UGent.be, Vicky.Stratigaki@UGent.be, Peter.Troch@UGent.beThis work is a continuation recently completed doctorate research at the Civil Engineering department of Ghent  University  (Belgium)  focusing on  the  numerical  modelling  of  “far  field”  effects  of  Wave  Energy Converter (WEC) arrays [1,2,3,4,5,6]. During this research a numerical coupled model has been developed between the wave propagation model MILDwave [7, 8] and the wave-structure interaction solver NEMOH [9] using the generic coupling methodology introduced by [10,11].The aim of this study is to estimate the wave height reduction in the lee of a WEC farm for  two different WEC types, a heaving point absorber (HPA) and an oscillating surge wave energy converter(OSWEC), using two different numerical approaches. Specifically for each WEC farm the wave height redistribution around the WECs which absorb wave power from incoming waves has been modelled using: (a) the traditional sponge layer technique which is implemented in MILDwave as presented in [8,10], and (b)  the MILDwave- NEMOH coupled model [11,12,13]. Within the latter numerical approach, for each WEC the Power-Take- Off (PTO) is modelled considering: (i) an optimal linear PTO; (ii) a sub-optimal linear PTO; and (iii) a Wave- to-Wire (W2W) [4] model of an hydraulic PTO.The above mentioned numerical approaches result into four simulations for each WEC farm in the present study. Comparisons between the different cases of the simulated WEC farms  show that the numerical approach described in (a) tends to overestimate the wave height reduction in the lee of the WEC farms for both WEC types studied. When analyzing the results obtained using the second numerical approach (b), it can be seen that, using a different WEC PTO system (cases (i)-(iii)) does not have a significant impact in the wave height reduction in the lee of the WEC farms for both WEC types studied. Additionally, it has been observed that even though the wave height reduction in the lee of the WEC farm does not differ much for each PTO system (cases (i)-(iii)), there is a variation in the two WEC farms power performance for all simulations. This is reflected in different average power output of the WEC farms for both WEC types studied and different PTO systems. This work fits in the “WECANet Working Group 1: Numerical hydrodynamic modelling of WECs”, and more specifically in the topic that focuses on coupling between codes for WEC simulation.                                                                                            COST is supported by the EU Framework Programme Horizon 2020. COST (European Cooperation in Science and Technology)  is a funding agency for research and innovation networks. COST Actions help connect research initiatives across Europe  and enable scientists to grow their ideas by sharing them with  their peers.   References [1] Verao Fernandez, Gael, Vicky Stratigaki, Panagiotis Vasarmidis, Philip Balitsky and Peter Troch. 2019. “A study of far field wake effects of arrays of heaving point absorber and oscillating wave surge WECs for long-crested and short-crested seas.” Water 11(6): 1-25, doi: 10.3390/w11061126 [2] Verao Fernandez, Gael, Vicky Stratigaki, and Peter Troch. 2019. “Irregular Wave Validation of a Coupling Methodology for Numerical Modelling of Near and Far Field Effects of Wave Energy Converter Arrays.” Energies 12 (3), ISSN: 1996-1073, doi: 10.3390/en12030538. [3] Verao Fernandez, Gael, Philip Balitsky, Vicky Stratigaki, and Peter Troch. 2018. “Coupling Methodology for Studying the Far Field Effects of Wave Energy Converter Arrays over a Varying Bathymetry.” Energies 11 (11), ISSN: 1996-1073, doi: 10.3390/en11112899. [4] Balitsky, Philip, Nicolas Quartier, Vicky Stratigaki, Gael Verao Fernandez, Panagiotis Vasarmidis and Peter Troch. 2018. “Analysing the near-field effects and the power production of an array of OSWECs: a real case study using a novel wave-to-wire model.” Water, 11(6): 1-30, doi:10.3390/w11061137 [5] Balitsky, Philip, Nicolas Quartier, Gael Verao Fernandez, Vicky Stratigaki, and Peter Troch. 2018. “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 (12) ISSN: 1996-1073, doi: 10.3390/en11123489. [6] Balitsky, Philip, Gael Verao Fernandez, Vicky Stratigaki, and Peter Troch. 2018. “Assessment of the Power Output of a Two-array Clustered WEC Farm Using a BEM Solver Coupling and a Wave-propagation Model.” Energies 11 (11): 1–23. ISSN: 1996-1073, doi: 10.3390/en11112907.[7]  Troch, P. MILDwave (1998). A Numerical Model for Propagation and Transformation of Linear Water Waves; Internal Report; Department of Civil Engineering, Ghent University: Zwijnaarde, Belgium. [7] Troch, P. MILDwave - A Numerical Model for Propagation and Transformation of Linear Water Waves. Technical report, Department of Civil Engineering, Ghent University, Ghent. Internal Report., 1998. [8] Troch, P. and Stratigaki, V. 2016. Phase-Resolving Wave Propagation Array Models. In Folley, M., editor, Numerical Modelling of Wave Energy Converters, chapter 10, pages 191–216. Elsevier. [9] Babarit, A. and Delhommeau, G. 2015. Theoretical and numerical aspects of the open source BEM solver NEMOH. In Proc. of the 11th European Wave and Tidal Energy Conference 6-11th Sept 2015, Nantes, France. [10] Stratigaki, V. 2014. Experimental Study and Numerical Modelling of Intra-array Interactions and Extra-array Effects of Wave Energy Converter Arrays. Ghent, Belgium: Ghent University. Faculty of Engineering and Architecture. [11] Stratigaki, V., Troch, P., and Forehand, D. 2019. “A Fundamental Coupling Methodology for Modelling Near-field and Far-field Wave Effects of Floating Structures and Wave Energy Devices.” Renewable Energy 143: 1608–1627. https://doi.org/10.1016/j.renene.2019.05.046 [12] Verbrugghe, T.; Stratigaki, V.; Troch, P.; Rabussier, R.; Kortenhaus, A. A comparison study of a generic coupling methodology for modeling wake effects of wave energy converter arrays. ENERGIES 2017, 10. [13] Verao Fernandez, G. 2019. A Numerical Study of the Far Field Effects of Wave Energy Converters in Short and Long-Crested Waves Utilizing a Coupled Model Suite. PhD thesis, Ghent University. Acknowledgements Vasiliki Stratigaki is a postdoctoral researcher (fellowship 1267321N) of the FWO (Fonds Wetenschappelijk Onderzoek - Research Foundation Flanders), Belgium. 29                                                                                            COST is supported by the EU Framework Programme Horizon 2020. COST (European Cooperation in Science and Technology)  is a funding agency for research and innovation networks. COST Actions help connect research initiatives across Europe  and enable scientists to grow their ideas by sharing them with  their peers.        ISBN: 9789080928107 This publication is based upon work from the WECANet COST Action CA17105,  supported by COST (European Cooperation in Science and Technology). Support is also provided by the FWO (Fonds Wetenschappelijk Onderzoek - Research Foundation Flanders), Belgium. Vasiliki Stratigaki is a postdoctoral researcher (fellowship 1267321N) of the FWO. www.wecanet.eu  COST (European Cooperation in Science and Technology) is a funding agency for research and innovation networks. COST Actions help connect research initiatives across Europe and enable scientists to grow their ideas by sharing them with their peers. This boosts their research, career and innovation.  www.cost.eu     Funded by the Horizon 2020 Framework Programme of the European Union      Book of Abstracts of the General Assembly 2020 (online event) of the   WECANet COST Action CA17105:   A pan-European Network for Marine Renewable Energy with a Focus on Wave Energy    Edited by  Vasiliki Stratigaki, Matt Folley, Peter Troch, Evangelia Loukogeorgaki,  Moncho Gómez-Gesteira, Aleksander Grm, Lorenzo Cappietti, Francesco Ferri,  Irina Temiz, Constantine Michailides, George Lavidas,  Milen Baltov, Liliana Rusu and Xenia Loizidou  

Numerical benchmark study of 'far field' effects of farms of WECs using linear and weekly non-linear models

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Numerical benchmark study of 'far field' effects of farms of WECs using linear and weekly non-linear models

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Ghent University Academic Bibliography