Abstract
The present study deals with the performance of an U-shaped oscillating water column device under the action of oblique incident waves. To solve the associated boundary value problem, the dual boundary element method (DBEM) is used. Various physical parameters associated with the U-shaped OWC device, such as the radiation susceptance and conductance coefficients, and the hydrodynamic efficiency, are analyzed for a wide range of wave and structural parameters. The study reveals that the resonance in the efficiency curve occurs for smaller values of wavenumber with an increase in chamber length, submergence depth of the front wall and opening duct, and width of the opening duct. It is observed that with appropriate combinations of the angle of incidence and incident wavenumber, more than 90% efficiency in the U-shaped OWC device can be achieved.
Highlights
Renewable energy has become an essential factor in the fields of environmental sustainability and energy policy, and it evolved as an alternative to fossil and nuclear energy sources due to their non-polluting nature, and plentiful energy harvested from self-renewing resources such as the sun, wind, wave, etc
Various Results Associated with the U-Shaped OWC Device In Figure 3a–c, the variation of the non-dimensional radiation susceptance μ, radiation conductance ν, and the efficiency of the device ηmax are plotted as a function of nondimensional wavenumber Kh1 for various chamber length b/h1
A comparison between the Figures 2 and 3 reveals that the overall pattern of the radiation susceptance μ and efficiency ηmax as a function of wavenumber Kh1 for the rectangular and U-shaped OWC devices are similar in nature
Summary
Renewable energy has become an essential factor in the fields of environmental sustainability and energy policy, and it evolved as an alternative to fossil and nuclear energy sources due to their non-polluting nature, and plentiful energy harvested from self-renewing resources such as the sun, wind, wave, etc. [14] analyzed the hydrodynamic performance of a rectangular OWC device placed over the stepped bottom numerically and experimentally under the irregular incident waves, and it was found that the incident wave frequency and the turbine damping coefficient play a vital role to enhance the efficiency of an OWC device as compared to the incident wave height. The following conclusions were obtained: (i) under the action of regular incident waves, the performance of the U-OWC significantly enhanced by the hydrodynamic parameters, (ii) the pneumatic power available to the turbine is more for the isolated U-OWC than the case when the same is present in an array, and (iii) in random waves environment, the chamber width significantly increases the average power output of the OWC device.
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