Abstract
Recently CorPower Ocean AB presented laboratory tests of a point absorber wave energy converter equipped with a novel technique for passive phase control. The technique, known as WaveSpring, widens the response bandwidth by a negative spring arrangement, and in the tank experiment an up to threefold increase in delivered power as compared to pure linear damping was observed. As previously reported, for point absorbers close to resonance, the use of standard radiation-diffraction models can become unreliable while CFD simulations accurately capture the nonlinear wave height dependent response. Thus, in the present study a module representing the WaveSpring technology was implanted in the OpenFOAM framework and CFD simulations of the buoy were performed both with and without the WaveSpring module. Good agreement between simulated and experimental results was observed, and the WaveSpring behavior was well captured in the numerical simulation. The CFD model can be used for further tuning of the WaveSpring/buoy design as well as providing validation data for radiation-diffraction models.
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References
Budal, K., & Falnes, J. (1975). A resonant point absorber of ocean-wave power. Nature, 256, 478–479.
CorPower. (2017). CorPower Ocean AB. http://www.corpowerocean.com. Accessed 02 February 2017.
Davidson, J., Cathelain, M., Guillemet, L., Huec, T., & Ringwood, J. (2015). Implementation of an OpenFOAM numerical wave tank for wave energy experiments. In Proceedings of the 11th European Wave and Tidal Energy Conference, Nantes, 6–11 September 2015.
EMEC. (2017). The European Marine Energy Centre Ltd. http://www.emec.org.uk/about-us/wave-clients/corpower-ocean. Accessed 02 February 2017.
Eskilsson, C., Palm, J., Kofoed, J. P., & Friis-Madsen, E. (2015). CFD study of the overtopping discharge of the Wave Dragon wave energy converter. In C. Guedes Soares (Ed.), Renewable Energies Offshore. 1st International Conference on Renewable Energies Offshore, Lisbon, November 2014 (p. 287). Croyden: CRC Press.
Evans, D. (1976). A theory for wave-power absorption by oscillating bodies. Journal of Fluid Mechanics, 77(1), 1–25.
Falnes, J. (2002). Optimum control of oscillation of wave-energy converters. International Journal of Offshore and Polar Engineering, 12(2), 147–155.
Giorgi, G., & Ringwood, J. V. (2016). Implementation of latching control in a numerical wave tank with regular waves. Journal of Ocean Engineering and Marine Energy, 2(2), 211–226.
Hals, J., Falnes, J., & Moan, T. (2011). A comparison of selected strategies for adaptive control of wave energy converters. Journal of Offshore Mechanics and Arctic Engineering, 133, 031101.
Jacobsen, N.-G., Fuhrman, D.-R., & Fredsøe, J. (2012). A wave generation toolbox for the open-source CFD library: OpenFoam®. International Journal for Numerical Methods in Fluids, 70, 1073–1088.
Kim, J.-W., Jang, H., Baquet, A., O’Sullivan, J., Lee, S., Kim, B., et al. (2016). Technical and economical readiness review of CFD-based numerical wave tank for offshore floater design. In Offshore Technology Conference, Houston, 2–5 May 2016.
Korde, U. A., & Ringwood, J. V. (2016). Hydrodynamic control of wave energy devices. Cambridge: Cambridge University Press.
Menter, F. R. (1994). Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 32, 1598–1605.
OpenFOAM. (2017). OpenCFD Ltd. http://www.openfoam.com. Accessed 02 February 2017.
Palm, J., Eskilsson, C., Moura Paredes, G., & Bergdahl, L. (2016). Coupled mooring analysis for floating wave energy converters using CFD: Formulation and validation. International Journal of Marine Energy, 16, 83–99.
Sumer, B. M., & Fredsøe, J. (1997). Hydrodynamics around cylindrical structures. Singapore: World Scientific Publisher.
Todalshaug, J. H. (2014). Wave Energy Convertor. Patent WO2015107158 A1, January 20, 2014.
Todalshaug, J. H., Ásgeirsson, G. S., Hjálmarsson, E., Maillet, J., Möller, P., Pires, P., et al. (2016). Tank testing of an inherently phase controlled wave energy converter. International Journal of Marine Energy, 15, 68–84.
Weller, H., Tabor, G., Jasak, H., & Fureby, C. (1998). A tensorial approach to computational continuum mechanics using object-oriented techniques. Computers in Physics, 12(6), 620–631.
Yu, Y.-H., & Li, Y. (2013). Reynolds-Averaged Navier-Stokes simulation of the heave performance of a two-body floating-point absorber wave energy system. Computers and Fluids, 73, 104–114.
Acknowledgements
The experimental data was gratefully provided by CorPower Ocean AB. We especially thank Dr. Jørgen Hals Todalshaug at CorPower for the invaluable assistance with regard to the WaveSpring implementation. Support for this work was given by the Swedish Energy Agency under grant no. P40428-1. The simulations were made on resources from Chalmers Centre for Computational Science and Engineering, provided by the Swedish National Infrastructure for Computing.
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Wu, M., Wang, W., Palm, J., Eskilsson, C. (2018). CFD Simulation of a Passively Controlled Point Absorber Wave Energy Converter. In: Ölçer, A., Kitada, M., Dalaklis, D., Ballini, F. (eds) Trends and Challenges in Maritime Energy Management. WMU Studies in Maritime Affairs, vol 6. Springer, Cham. https://doi.org/10.1007/978-3-319-74576-3_34
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DOI: https://doi.org/10.1007/978-3-319-74576-3_34
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