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Prediction of regular wave loads on a fixed offshore oscillating water column-wave energy converter using CFD

Citation

Elhanafi, A, Prediction of regular wave loads on a fixed offshore oscillating water column-wave energy converter using CFD, Journal of Ocean Engineering and Science, 1, (4) pp. 268-283. ISSN 2468-0133 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 Shanghai Jiaotong University. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/

DOI: doi:10.1016/j.joes.2016.08.001

Abstract

In this paper, hydrodynamic wave loads on an offshore stationary–floating oscillating water column (OWC) are investigated via a 2D and 3D computational fluid dynamics (CFD) modeling based on the RANS equations and the VOF surface capturing scheme. The CFD model is validated against previous experiments for nonlinear regular wave interactions with a surface-piercing stationary barge. Following the validation stage, the numerical model is modified to consider the pneumatic damping effect, and an extensive campaign of numerical tests is carried out to study the wave–OWC interactions for different wave periods, wave heights and pneumatic damping factors. It is found that the horizontal wave force is usually larger than the vertical one. Also, there a direct relationship between the pneumatic and hydrodynamic vertical forces with a maximum vertical force almost at the device natural frequency, whereas the pneumatic damping has a little effect on the horizontal force. Additionally, simulating the turbine damping with an orifice plate induces higher vertical loads than utilizing a slot opening. Furthermore, 3D modeling significantly escalates and declines the predicted hydrodynamic vertical and horizontal wave loads, respectively.

Item Details

Item Type:Refereed Article
Keywords:Offshore oscillating water column; OWC; Hydrodynamic wave loads; Numerical wave tank; CFD; 3D effects
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Naval Architecture
Objective Division:Energy
Objective Group:Renewable Energy
Objective Field:Wave Energy
Author:Elhanafi, A (Mr Ahmed Elhanafi)
ID Code:114325
Year Published:2016
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-02-11
Last Modified:2017-06-06
Downloads:0

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