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Effects of seabed morphology on oscillating water column wave energy converters

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  • Medina-López, E.
  • Bergillos, R.J.
  • Moñino, A.
  • Clavero, M.
  • Ortega-Sánchez, M.

Abstract

This paper presents a numerical model to analyse the effects of changes in the bedforms morphology on Oscillating Water Column (OWC) wave energy devices. The model was developed in FLUENT® and based on the Actuator Disk Model theory to simulate the turbine performance. The seabed forms were reproduced with the morphodynamic model XBeach-G for a series of characteristic sea states in Playa Granada (southern Spain). These bedforms were used as input bed geometries in FLUENT® and compared with a hypothetical flat seabed to analyse the effects of changes in bed level on the OWC performance. Results of the simulated sea states reveal the influence of the seabed morphology in the power take–off performance, affecting the relationship between pressure drop and air flow rate through the turbine. Energy dissipation was found to be directly dependent on the bedforms unit volume. This lead to lower mean efficiencies for the cases with evolved morphologies (up to 15%) compared to those obtained for the hypothetical flat cases (19%). The effects of seabed formations on the power take–off performance presented in this paper can be of interest in planning control strategies for OWC devices.

Suggested Citation

  • Medina-López, E. & Bergillos, R.J. & Moñino, A. & Clavero, M. & Ortega-Sánchez, M., 2017. "Effects of seabed morphology on oscillating water column wave energy converters," Energy, Elsevier, vol. 135(C), pages 659-673.
    • Handle: RePEc:eee:energy:v:135:y:2017:i:c:p:659-673
    DOI: 10.1016/j.energy.2017.06.165
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    References listed on IDEAS

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    1. López, I. & Pereiras, B. & Castro, F. & Iglesias, G., 2014. "Optimisation of turbine-induced damping for an OWC wave energy converter using a RANS–VOF numerical model," Applied Energy, Elsevier, vol. 127(C), pages 105-114.
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    3. Heras-Saizarbitoria, Iñaki & Zamanillo, Ibon & Laskurain, Iker, 2013. "Social acceptance of ocean wave energy: A case study of an OWC shoreline plant," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 515-524.
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    1. Moñino, A. & Quirós, C. & Mengíbar, F. & Medina-Lopez, E. & Clavero, M., 2020. "Thermodynamics of the OWC chamber: Experimental turbine performance under stationary flow," Renewable Energy, Elsevier, vol. 155(C), pages 317-329.
    2. Deng, Zhengzhi & Wang, Lin & Zhao, Xizeng & Wang, Peng, 2020. "Wave power extraction by a nearshore oscillating water column converter with a surging lip-wall," Renewable Energy, Elsevier, vol. 146(C), pages 662-674.
    3. Molina, A. & Jiménez-Portaz, M. & Clavero, M. & Moñino, A., 2022. "The effect of turbine characteristics on the thermodynamics and compression process of a simple OWC device," Renewable Energy, Elsevier, vol. 190(C), pages 836-847.
    4. Molina-Salas, A. & Quirós, C. & Gigant, P. & Huertas-Fernández, F. & Clavero, M. & Moñino, A., 2023. "Exergy assessment and sustainability of a simple off-shore oscillating water column device," Energy, Elsevier, vol. 264(C).
    5. Liu, Zhen & Xu, Chuanli & Qu, Na & Cui, Ying & Kim, Kilwon, 2020. "Overall performance evaluation of a model-scale OWC wave energy converter," Renewable Energy, Elsevier, vol. 149(C), pages 1325-1338.
    6. Rezanejad, K. & Gadelho, J.F.M. & Guedes Soares, C., 2019. "Hydrodynamic analysis of an oscillating water column wave energy converter in the stepped bottom condition using CFD," Renewable Energy, Elsevier, vol. 135(C), pages 1241-1259.
    7. Zarzuelo, Carmen & López-Ruiz, Alejandro & Ortega-Sánchez, Miguel, 2018. "Impact of human interventions on tidal stream power: The case of Cádiz Bay," Energy, Elsevier, vol. 145(C), pages 88-104.
    8. Carballo, R. & Arean, N. & Álvarez, M. & López, I. & Castro, A. & López, M. & Iglesias, G., 2019. "Wave farm planning through high-resolution resource and performance characterization," Renewable Energy, Elsevier, vol. 135(C), pages 1097-1107.
    9. Sun, Peidong & Xu, Bin & Wang, Jichao, 2022. "Long-term trend analysis and wave energy assessment based on ERA5 wave reanalysis along the Chinese coastline," Applied Energy, Elsevier, vol. 324(C).
    10. Molina–Salas, A. & Longo, S. & Clavero, M. & Moñino, A., 2023. "Theoretical approach to the scale effects of an OWC device," Renewable Energy, Elsevier, vol. 219(P2).
    11. Medina-López, E. & Moñino, A. & Bergillos, R.J. & Clavero, M. & Ortega-Sánchez, M., 2019. "Oscillating water column performance under the influence of storm development," Energy, Elsevier, vol. 166(C), pages 765-774.

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