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Performance of an oscillating water column in the presence of an elevated seabed.

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Title: Performance of an oscillating water column in the presence of an elevated seabed.
Authors: Venkateswarlu, V.1 (AUTHOR) venki@nitsri.ac.in, AlYousif, Ahmad2 (AUTHOR), Nishad, C. S.3 (AUTHOR), Ahanger, M. A.1 (AUTHOR)
Source: Journal of Marine Science & Technology. Jun2026, Vol. 31 Issue 2, p206-230. 25p.
Subjects: Ocean wave power, Potential flow, Resonant vibration, Oceanographic maps, Frequencies of oscillating systems, Energy harvesting
Abstract: The effect of impermeable seabed undulation is examined on the performance of an oscillating water column (OWC) wave-energy converter (WEC) against oblique incident waves. The multi-domain boundary element method is adopted to address the unknown hydrodynamic coefficients of engineering interest based on the linearized potential flow theory. Various types of seabed geometries such as rectangular bottom elevation (RBE), semi-trapezoidal bottom (STB), and semi-circular bottom (SCB) of impermeable and permeable kind are placed underneath the OWC-WEC, and their effect on the variation of OWC efficiency, radiation susceptance, radiation conductance, and wall-force coefficient is reported and evaluated against the relative wave frequency. The significance of angle of incidence, lip-wall rotation, chamber spacing, undulation height, and porosity on the variation of hydrodynamic coefficients is reported. The behavior of OWC efficiency is observed to be different when compared with other traditional behavior of OWC-WEC under various conditions. The magnitude of fluid resonance is higher after introducing the bottom undulations of the porous kind when compared with the impermeable undulations. The increase of the angle of incidence suppresses the fluid resonance in the chamber region, which leads to the drastic reduction of OWC efficiency. The enhancement of seabed height minimizes the gap region that leads to the enhancement of OWC efficiency for moderate wave frequencies. Finally, the comparative study is reported between all three seabed geometries, like RBE, STB, SCB, etc., with no-bottom undulation, and among them, the performance of OWC with RBE is significant. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Marine Science & Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 194359290
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Performance of an oscillating water column in the presence of an elevated seabed.
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  Data: <searchLink fieldCode="DE" term="%22Ocean+wave+power%22">Ocean wave power</searchLink><br /><searchLink fieldCode="DE" term="%22Potential+flow%22">Potential flow</searchLink><br /><searchLink fieldCode="DE" term="%22Resonant+vibration%22">Resonant vibration</searchLink><br /><searchLink fieldCode="DE" term="%22Oceanographic+maps%22">Oceanographic maps</searchLink><br /><searchLink fieldCode="DE" term="%22Frequencies+of+oscillating+systems%22">Frequencies of oscillating systems</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+harvesting%22">Energy harvesting</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The effect of impermeable seabed undulation is examined on the performance of an oscillating water column (OWC) wave-energy converter (WEC) against oblique incident waves. The multi-domain boundary element method is adopted to address the unknown hydrodynamic coefficients of engineering interest based on the linearized potential flow theory. Various types of seabed geometries such as rectangular bottom elevation (RBE), semi-trapezoidal bottom (STB), and semi-circular bottom (SCB) of impermeable and permeable kind are placed underneath the OWC-WEC, and their effect on the variation of OWC efficiency, radiation susceptance, radiation conductance, and wall-force coefficient is reported and evaluated against the relative wave frequency. The significance of angle of incidence, lip-wall rotation, chamber spacing, undulation height, and porosity on the variation of hydrodynamic coefficients is reported. The behavior of OWC efficiency is observed to be different when compared with other traditional behavior of OWC-WEC under various conditions. The magnitude of fluid resonance is higher after introducing the bottom undulations of the porous kind when compared with the impermeable undulations. The increase of the angle of incidence suppresses the fluid resonance in the chamber region, which leads to the drastic reduction of OWC efficiency. The enhancement of seabed height minimizes the gap region that leads to the enhancement of OWC efficiency for moderate wave frequencies. Finally, the comparative study is reported between all three seabed geometries, like RBE, STB, SCB, etc., with no-bottom undulation, and among them, the performance of OWC with RBE is significant. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Marine Science & Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1007/s00773-026-01112-3
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      – Code: eng
        Text: English
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        PageCount: 25
        StartPage: 206
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      – SubjectFull: Ocean wave power
        Type: general
      – SubjectFull: Potential flow
        Type: general
      – SubjectFull: Resonant vibration
        Type: general
      – SubjectFull: Oceanographic maps
        Type: general
      – SubjectFull: Frequencies of oscillating systems
        Type: general
      – SubjectFull: Energy harvesting
        Type: general
    Titles:
      – TitleFull: Performance of an oscillating water column in the presence of an elevated seabed.
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            NameFull: Venkateswarlu, V.
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            NameFull: AlYousif, Ahmad
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            NameFull: Nishad, C. S.
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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