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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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    2. 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.
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    6. 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.
    7. 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.
    8. 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.
    9. 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).
    10. 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.

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