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Article

Influence of the Drag Force on the Average Absorbed Power of Heaving Wave Energy Converters Using Smoothed Particle Hydrodynamics

1
Department of Civil Engineering, Ghent University, Technologiepark 60, 9052 Zwijnaarde, Belgium
2
Environmental Physics Laboratory (EPhysLab), CIM-UVIGO, Universidade de Vigo, 36310 Vigo, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Xiangyu Hu
Water 2021, 13(3), 384; https://doi.org/10.3390/w13030384
Received: 31 December 2020 / Revised: 27 January 2021 / Accepted: 27 January 2021 / Published: 2 February 2021
In this paper, we investigated how the added mass, the hydrodynamic damping and the drag coefficient of a Wave Energy Converter (WEC) can be calculated using DualSPHysics. DualSPHysics is a software application that applies the Smoothed Particle Hydrodynamics (SPH) method, a Lagrangian meshless method used in a growing range of applications within the field of Computational Fluid Dynamics (CFD). Furthermore, the effect of the drag force on the WEC’s motion and average absorbed power is analyzed. Particularly under controlled conditions and in the resonance region, the drag force becomes significant and can greatly reduce the average absorbed power of a heaving point absorber. Once the drag coefficient has been determined, it is used in a modified equation of motion in the frequency domain, taking into account the effect of the drag force. Three different methods were compared for the calculation of the average absorbed power: linear potential flow theory, linear potential flow theory modified to take the drag force into account and DualSPHysics. This comparison showed the considerable effect of the drag force in the resonance region. Calculations of the drag coefficient were carried out for three point absorber WECs: one spherical WEC and two cylindrical WECs. Simulations in regular waves were performed for one cylindrical WEC with two different power take-off (PTO) systems: a linear damping and a Coulomb damping PTO system. The Coulomb damping PTO system was added in the numerical coupling between DualSPHysics and Project Chrono. Furthermore, we considered the optimal PTO system damping coefficient taking the effect of the drag force into account. View Full-Text
Keywords: SPH; WEC; drag force; power take-off (PTO) system; DualSPHysics; numerical coupling; multiphysics SPH; WEC; drag force; power take-off (PTO) system; DualSPHysics; numerical coupling; multiphysics
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MDPI and ACS Style

Quartier, N.; Ropero-Giralda, P.; M. Domínguez, J.; Stratigaki, V.; Troch, P. Influence of the Drag Force on the Average Absorbed Power of Heaving Wave Energy Converters Using Smoothed Particle Hydrodynamics. Water 2021, 13, 384. https://doi.org/10.3390/w13030384

AMA Style

Quartier N, Ropero-Giralda P, M. Domínguez J, Stratigaki V, Troch P. Influence of the Drag Force on the Average Absorbed Power of Heaving Wave Energy Converters Using Smoothed Particle Hydrodynamics. Water. 2021; 13(3):384. https://doi.org/10.3390/w13030384

Chicago/Turabian Style

Quartier, Nicolas, Pablo Ropero-Giralda, José M. Domínguez, Vasiliki Stratigaki, and Peter Troch. 2021. "Influence of the Drag Force on the Average Absorbed Power of Heaving Wave Energy Converters Using Smoothed Particle Hydrodynamics" Water 13, no. 3: 384. https://doi.org/10.3390/w13030384

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