Journal of Mechanical Science and Technology

, Volume 32, Issue 12, pp 5729–5736 | Cite as

Performance improvement of an oscillating water column wave energy converter by geometry modification

  • Deepak Divashkar Prasad
  • Mohammed Rafiuddin Ahmed
  • Young-Ho LeeEmail author


The performance of an oscillating water column (OWC) device, obtained from computations, was validated with experimental results. The current numerical code showed good agreement with experimental data and also with mathematical models. The base model which recorded rotor power of 0.17 W and efficiency of 8.28 % was then modified–the OWC chamber geometry and the rotor geometry were modified. The best model recorded rotor power and efficiency of 0.34 W and 16.1 %, respectively. Comparing this with the base model, the improvement in rotor efficiency was approximately 94 %. The flow conditions in the current numerical work were fixed and rotor speed was also kept constant. The work highlights that the performance of the rotor at fixed condition can be improved by optimizing the OWC chamber geometry and the rotor design. Furthermore, the current work also highlights that the design of the rotor is strongly influenced by the OWC chamber it is employed in.


Wave energy Computational fluid dynamics (CFD) Savonius rotor Oscillating water column (OWC) Particle image velocimetry (PIV) 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    B. Drew, A. R. Plummer and M. N. Sahinkaya, A review of wave energy converter technology, Proc. IMechE., Int. J. Power and Energy, 223 (2009) 887–902.Google Scholar
  2. [2]
    A. F. O. Falcao, A. Wave energy utilization: A review of technologies, Renewable and Sustainable Energy Reviews, 14 (2010) 899–918.Google Scholar
  3. [3]
    J. J. Patel, T. B. Patel and D. A. Patel, Current status of well turbine for wave energy conversion, International Journal for Scientific Research & Development, 2 (11) (2015) 91–96.Google Scholar
  4. [4]
    A. F. O. Falcao and J. C. C. Henriques, Oscillating water columns wave energy converters and air turbines–A review, Renewable Energy, 85 (2016) 1391–1424.CrossRefGoogle Scholar
  5. [5]
    D. D. Prasad, M. R. Ahmed and Y. H. Lee, Flow and performance characteristics of a direct drive turbine for wave power generation, Ocean Engineering, 81 (2014) 39–49.CrossRefGoogle Scholar
  6. [6]
    N. I. Khan, T. M. Iqbal, M. Hinchey and V. Masek, Performance of savonius rotor as a water current turbine, Journal of Ocean Technology, 4 (2) (2009) 71–83.Google Scholar
  7. [7]
    G. S. Bikas, H. Ramesh and H. Vijaykumar, Study on performance of savonius rotor type wave energy converter used in conjunction conventional rubble mound breaker, Ocean Engineering, 89 (2014) 62–68.CrossRefGoogle Scholar
  8. [8]
    M. Faizal, M. R. Ahmed and Y. H. Lee, On utilizing the orbital motion in water waves to drive a savonius rotor, Renewable Energy, 35 (2010) 164–169.CrossRefGoogle Scholar
  9. [9]
    V. Hindasageri, H. Ramesh and A. Gaurav, Effect of variation of wave height and ocean depth on the performance of savonius rotors utilizing the orbital motion of ocean waves in shallow waters, Journal of Sustainable Energy and Environment, 3 (2012) 53–57.Google Scholar
  10. [10]
    M. R. Ahmed, M. Faizal and Y. H. Lee, Optimization of blade curvature and inter rotor spacing of savonius rotors for maximum wave energy extraction, Ocean Engineering, 65 (1) (2013) 32–38.CrossRefGoogle Scholar
  11. [11]
    M. Tutar and I. Veci, Performance analysis of a horizontal axis 3–bladed savonius type wave turbine in an experimental wave flume (EWF), Renewable Energy, 86 (2016) 8–25.CrossRefGoogle Scholar
  12. [12]
    B. H. Kim, J. Wata, M. A. Zullah, M. R. Ahmed and Y. H. Lee, Numerical and experimental studies on the PTO system of a novel floating wave energy converter, Renewable Energy, 79 (2015) 111–121.CrossRefGoogle Scholar
  13. [13]
    A. El Marjani, F. Castro, M. Bahaji and B. Filali, 3D unsteady flow simulation in an OWC wave converter plant, Proceedings of Int. Conf. On Renewable energy and Power Quality (ICREPQ'06), Mallorca, Espagne (2006).CrossRefGoogle Scholar
  14. [14]
    Z. Liu, J. Y. Jin, B. S. Hyun and K. Y. Hong, Review of application of VOF based NWT on integrated OWC system, Journal of the Korean Society for Marine Environmental Engineering, 15 (2) (2012) 111–117.CrossRefGoogle Scholar
  15. [15]
    I. Lopez, G. Iglesias, M. Loopez, F. Castro and M. A. Rodriquez, Turbine–Chamber coupling in an OWC wave energy converter, Costal Engineering (2012) 1–7.Google Scholar
  16. [16]
    D. D. Prasad, M. R. Ahmed, Y. H. Lee and R. N. Sharma, Validation of a piston type wave–maker using numerical wave tank, Ocean Engineering, 131 (2017) 57–67.CrossRefGoogle Scholar
  17. [17]
    M. A. Zullah and Y. H. Lee, Performance evaluation of a direct drive wave energy converter using CFD, Renewable Energy, 49 (2013) 237–241.CrossRefGoogle Scholar
  18. [18]
    A. Lal and M. Elangovan, CFD Simulation and validation of flap type wave–maker, World Academy of Science, Engineering and Technology, 46 (2008) 76–82.Google Scholar
  19. [19]
    M. Elangovan, Simulation of irregular waves by CFD, World Academy of Science, Engineering and Technology–International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 5 (7) (2011) 1379–1383.MathSciNetGoogle Scholar
  20. [20]
    A. E. Maguire, Hydrodynamics, control and numerical modelling of absorbing wavemakers, Ph.D. Dissertation, The University of Edinburgh, UK (2011).Google Scholar
  21. [21]
    J. Falnes, Ocean waves and oscillating systems, Cambridge Univ. Press (2002).CrossRefGoogle Scholar
  22. [22]
    D. D. Prasad, C. G. Kim, H. G. Kang, M. R. Ahmed and Y. H. Lee, Performance and flow characteristics of single and a novel double oscillating water column devices, Journal of Mechanical Science and Technology, 31 (12) (2017) 5879–5886.CrossRefGoogle Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Deepak Divashkar Prasad
    • 1
  • Mohammed Rafiuddin Ahmed
    • 1
  • Young-Ho Lee
    • 2
    Email author
  1. 1.Division of Mechanical EngineeringThe University of the South PacificSuvaFiji
  2. 2.Division of Mechanical and Energy System Engineering, College of EngineeringKorea Maritime and Ocean UniversityBusanKorea

Personalised recommendations