Publisher DOI: 10.1016/j.renene.2022.10.103
Title: Numerical and experimental study of the hydrodynamic coefficients and power absorption of a two-body point absorber wave energy converter
Language: English
Authors: Rahimi, Amir 
Rezaei, Saeed 
Parvizian, Jamshid 
Mansourzadeh, Shahriar 
Lund, Jorrid 
Hssini, Radhouane 
Düster, Alexander 
Keywords: Hydrodynamic coefficients; Two-body point absorber; Viscous damping coefficients; Wave energy converter
Issue Date: Dec-2022
Source: Renewable Energy 201: 181-193 (2022-12)
Abstract (english): 
This study compares the hydrodynamic coefficients of a two-body point absorber wave energy converter (WEC) model obtained by three methods, namely the experimental method, the finite volume method (FVM), and the boundary element method (BEM). The BEM and FVM numerical simulations of the WEC motion are done using ANSYS AQWA and OpenFOAM, respectively. An experimental method for the accurate calculation of the added mass, damping coefficient, and wave excitation force for the WEC is introduced. The experiments are carried out in a wave tank with a scaled-down WEC model. A comparison of the results shows that – although the BEM is computationally fast, inexpensive, and able to estimate the added mass of the WEC with a reasonable accuracy – it is not able to accurately calculate the damping coefficients. The power absorbed by the WEC is calculated using the hydrodynamic coefficients obtained by all methods. The results show that the viscous damping dramatically decreases the absorbed power. A practical range of dimensionless damping coefficients is proposed to estimate the viscous damping of a two-body point absorber WEC, based on the experimental and FVM results. The upper bound of the absorbed power is also discussed in this paper.
ISSN: 0960-1481
Journal: Renewable Energy 
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Document Type: Article
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