Hydrodynamic Investigation on a Land-Fixed OWC Wave Energy Device under Irregular Waves

The hydrodynamic response of a land-based oscillating water column (OWC) wave energy converter under various irregular wave conditions is investigated numerically. Based on the potential flow theory, a two-dimensional fully nonlinear numerical wave flume (NWF) is developed to model the hydrodynamic...

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Bibliographic Details
Published in:Applied sciences 2022-03, Vol.12 (6), p.2855
Main Authors: Zhou, Zhimin, Ke, Song, Wang, Rongquan, Mayon, Robert, Ning, Dezhi
Format: Article
Language:English
Subjects:
Alternative energy sources
Boundary conditions
Boundary element method
Chambers
Converters
Energy
Energy spectra
Environmental impact
Flow theory
Flow velocity
Free surfaces
HOBEM
hydrodynamic performance
Incident waves
Investigations
irregular wave
oscillating water column (OWC)
Potential flow
Renewable resources
Resonant frequencies
Turbines
Two dimensional flow
Two dimensional models
Vertical motion
Water circulation
Water column
Wave energy
Wave height
Wave power
Wind farms
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Summary:The hydrodynamic response of a land-based oscillating water column (OWC) wave energy converter under various irregular wave conditions is investigated numerically. Based on the potential flow theory, a two-dimensional fully nonlinear numerical wave flume (NWF) is developed to model the hydrodynamic characteristics using the time-domain higher-order boundary element method (HOBEM). The inner-domain sources method and JONSWAP energy spectrum is used to generate the irregular incident waves, and a linear pneumatic model is used to determine the pneumatic pressure inside the chamber. The free surface elevations at the chamber centre and the oscillatory pneumatic pressures induced by the vertical motion of the water column are recorded. The influence of irregular waves on the hydrodynamic characteristics of the OWC device is carried out by comparison with the regular waves, and a number of significant wave heights and peak wave periods are considered. The hydrodynamic efficiency of the OWC device in irregular wave conditions is observed to be lower than that in regular waves for most wave frequencies, especially near the resonant frequency.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12062855