American Journal of Mechanical Engineering
ISSN (Print): 2328-4102 ISSN (Online): 2328-4110 Website: Editor-in-chief: Kambiz Ebrahimi, Dr. SRINIVASA VENKATESHAPPA CHIKKOL
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American Journal of Mechanical Engineering. 2020, 8(3), 88-105
DOI: 10.12691/ajme-8-3-1
Open AccessArticle

Numerical Investigation of an Offshore Oscillating Water Column

Frimpong Opoku1, Michael Atkinson1, and Mohammad Nasim Uddin1

1Mechanical Engineering, North Carolina A&T State University, Greensboro, USA

Pub. Date: September 16, 2020

Cite this paper:
Frimpong Opoku, Michael Atkinson and Mohammad Nasim Uddin. Numerical Investigation of an Offshore Oscillating Water Column. American Journal of Mechanical Engineering. 2020; 8(3):88-105. doi: 10.12691/ajme-8-3-1


In this study, a Numerical Wave Tank (NWT) was used to investigate the flowfield of an offshore Oscillating Water Column (OWC). An inviscid solution coupled to the Volume of Fluid method was carried out using ANSYSTM Fluent to simulate six different offshore OWC configurations. The waterside chamber angle, θ1, shoreside chamber angle, θ2, and immersion extension depth d, were varied to evaluate their effect on pneumatic power and efficiency. It was determined that configuration parameters with θ1 = 45o, θ2 = 90o and d = 0 m produced the highest power with an efficiency of 23.1%; results showed that this case had a higher static pressure inside the duct which was the predominant reason for a higher pneumatic power. The cases with an additional extension into the water, d, was found to reduce the pneumatic power when compared to a similar case without an extension.

offshore oscillating water column numerical wave tank pneumatic power volume of fluid inviscid flow

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[1]  Ross, D., “Power from Sea Waves,” Oxford: Oxford University Press. 1995.
[2]  Falcao, A. F. O., “Wave energy utilization: A review of the technologies”, Renewable and Sustainable Energy Reviews, Elsevier, 14(2010). 899-900. Oct. 2009.
[3]  Giovanni, C., “The first oil shock, stylized facts, reflections and the easterly puzzle in a forty-year retrospective, Munich Personal RePEc Archive, 4-9. Aug. 2014.
[4]  OECD and IEA, “OECD Green Growth Studies: Energy”, Preliminary Version. 9-20. 2011.
[5]  Mork, G., Barstow, S., Kabuth, A., Pontes, M.T., “Assessing the global wave energy potential,” In: Proceedings of the OMAE2010 (ASME), 29th International Conference on Ocean, Offshore Mechanics and Arctic Engineering, Shanghai, China. 447-454. June 2010.
[6]  Aderinto, T. and Li, H., “Ocean Wave Energy Converters: Status and Challenges”, Energies MDPI. 1. May 2018.
[7]  Guedes Soares, C., Bhattacharjee, J. and Karmakar, D., “Overview and Prospects for Development of Wave and Offshore Wind Energy,” 65(2), 88. Feb. 2014.
[8]  Cruz, J., “Ocean Wave Energy: Current Status and Future Perspective”, Springer Science and Business Media: Berlin/Heidelberg, Germany. 2007.
[9]  Windt, C., Davidson, J. and Ringwood, J. V., “High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics - based numerical wave tanks,” Renewable and Sustainable Energy Reviews, Elsevier, 610. May 2018.
[10]  Chenari, B., Saadatian, S.S., Ferreira, A., “Wave Energy Systems: An overview of different wave energy converters and recommendation for future improvement” Eight International Technology, Education and Development Conference, Valencia, Spain. March 2014.
[11]  Singh, U., Abdussaime, N., and Hore, J., “Hydrodynamic performance of a floating offshore OWC wave energy converter: An experimental study,” Renewable and Sustainable Energy Reviews, Elsevier. 117 (2020). Oct. 2019.
[12]  Mingham, C., Qian, L., and Causon, D., “Computational Fluid Dynamics (CFD) Models”, In: Numerical Modelling of Wave Energy Converters - State-of-the-art techniques for single devices and arrays. Elsevier Inc. 105-113. 2016.
[13]  Zabihi, M., Mazaheri, S. and Namin, M. M., “Experimental hydrodynamic investigation of a fixed offshore Oscillating Water Column device,” Applied Ocean Research, Elsevier, 85(2019). 20-33. Feb 2019.
[14]  Elhanafi, A., Fleming, A., Macfarlane, G., and Leong, Z., “Numerical hydrodynamic analysis of an offshore stationary - floating oscillating water column - wave energy converter using CFD,” International Journal of Naval Architecture and Ocean Engineering, Elsevier, 9(2017). 77-79. Oct. 2016.
[15]  Elhanafi, A., and Kim, C. J., “Experimental and numerical investigation on wave height and power take-off damping effects on the hydrodynamic performance of an offshore-stationary OWC wave energy converter,” Renewable Energy, Elsevier, 125(2018). 518-528. March 2018.
[16]  Crema, I., Simeonetti, I., Cappietti, L., and Oumeraci, H., “Laboratory experiments on Oscillating Water Column wave energy converters integrated in a very large floating structures,” Proceedings of the 11th European Wave and Tidal Energy Conference (EWTEC). Nantes, France. Sept. 2015.
[17]  Uddin, M. N., Atkinson, M., Opoku, F. “A Computational Fluid Dynamics Investigation of a Numerically Simulated Wave Tank,” American Journal of Mechanical Engineering, vol. 8, no. 1 (2020): 40-49. 40-49. May 2020.
[18]  Anbarsooz, M., Passandideh-Farad, M., and Moghiman, M., “Fully Nonlinear Viscous Wave Generation in Numerical Wave Tanks,” Elsevier, Ocean Engineering, 59(2013), 73-85. Nov. 2012.
[19]  Gomes, M. N., Olinto, C. R., Rocha, L. A. O., Souza, J.A. and Isoldi, L. A. “Computational Modelling of a Regular Wave Tank,” Engenharia Termica (Thermal Engineering), 8(01), 44-50. June 2009.
[20]  Dizadji, N., and Sajadian, S. E., “Modeling and Optimization of the chamber of OWC system”, Energy, Elsevier, 36(2011). 2362. Apr 2011.
[21]  Mahnamfar, F. and Altunkaynak, A., “Comparison of numerical and experimental analyses for optimizing the geometry of OWC systems”. Ocean Engineering, Elsevier, 130(2017), 10-24. Nov. 2016.
[22]  Feng, X. and Wu, W., “Generation of Water Waves Using Momentum Source Wave-Maker Applied to a RANS Solver”. Hindawi - Mathematical Problems in Engineering. 1-11. May 2019.
[23]  Ye, S., Lin, Y., Xu, L. and Wu, J., “Improving Initial Guess for the Iterative Solution of Linear Equation Systems in Incompressible Flow”. Mathematics MDPI. 1-20. Jan. 2020.