Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/126216
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Type: | Journal article |
Title: | Linear and nonlinear hydrodynamic models for dynamics of a submerged point absorber wave energy converter |
Author: | Schubert, B. Robertson, W. Cazzolato, B. Ghayesh, M. |
Citation: | Ocean Engineering, 2020; 197:106828-1-106828-12 |
Publisher: | Elsevier |
Issue Date: | 2020 |
ISSN: | 0029-8018 1873-5258 |
Statement of Responsibility: | Benjamin W. Schubert, William S.P. Robertson, Benjamin S. Cazzolato, Mergen H. Ghayesh |
Abstract: | This study compares the response of a submerged CETO-shaped point absorber wave energy converter using linear, partially-nonlinear, pseudo-nonlinear, and fully-nonlinear methods to model hydrodynamic effects. Linear potential flow models calculate hydrodynamic parameters to represent the fluid-structure interaction; typical dynamic models apply these parameters without pose-dependence. The partially-nonlinear method evaluates excitation forces at different poses to introduce a pose-dependent excitation force; in addition to the excitation force, the pseudo-nonlinear method calculates hydrodynamic coefficients using linear potential flow methods and includes pose-dependence through interpolating pre-calculated parameters to represent the radiation force. The fully-nonlinear CFD model is a numerical wave tank validated against published data. The applicability of linear-based methods has been explored by comparing the motion, force, and power of the system under various operating conditions against the fully-nonlinear results. It was expected that for low amplitude waves results tend towards the linear results; however, for both low amplitude waves and increased submergence depth, linear methods provided poor representations of the nonlinear CFD results. Geometric nonlinearities were insufficient to capture all the nonlinear behaviour. A frequency-dependent nonlinearity was identified in the water above the buoy resonating. For such submerged point absorbers, linear methods do not adequately represent the influential nonlinear effects. |
Keywords: | Wave energy converter; Submerged point absorber; Fully and partially nonlinear hydrodynamics; Numerical wave tank |
Description: | Available online 18 December 2019 |
Rights: | © 2019 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.oceaneng.2019.106828 |
Published version: | http://dx.doi.org/10.1016/j.oceaneng.2019.106828 |
Appears in Collections: | Aurora harvest 8 Mechanical Engineering publications |
Files in This Item:
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hdl_126216.pdf | Accepted version | 6.54 MB | Adobe PDF | View/Open |
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