Abstract
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.
Highlights
With the rapid development of industry and environmental problems caused by the overexploitation of limited fossil fuels resources, the adoption of green and safe renewable energy technologies is crucial to meet increasing global energy demands
Wave farms can efficiently operate for longer durations, functioning up to about 90% of the time, which is higher than wind farms and solar parks that are affected by the weather and usually generate power 20–30% of the time [2]
The relevant integral formula was introduced to calculate the hydrodynamic efficiency in this study. They investigated the hydrodynamic characteristics of the oscillating water column (OWC)-wave energy converter (WEC) with a stepped seabed in regular and irregular wave conditions using the open-source code OpenFOAM [16]
Summary
With the rapid development of industry and environmental problems caused by the overexploitation of limited fossil fuels resources, the adoption of green and safe renewable energy technologies is crucial to meet increasing global energy demands. The relevant integral formula was introduced to calculate the hydrodynamic efficiency in this study Later, they investigated the hydrodynamic characteristics of the OWC-WECs with a stepped seabed in regular and irregular wave conditions using the open-source code OpenFOAM [16]. They investigated the hydrodynamic characteristics of the OWC-WECs with a stepped seabed in regular and irregular wave conditions using the open-source code OpenFOAM [16] Validation of their model was achieved by comparing the experiment data with the numerical results (wave surface spectrum and pressure spectrum inside the central chamber) in irregular wave conditions. Based on the fully nonlinear potential flow theory, the hydrodynamic characteristics of a land-fixed OWC device in the irregular wave conditions are numerically investigated using higher-order boundary element method (HOBEM) in the present study.
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