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<p>The Oscillating Wave Surge Converter (OWSC) is recognised as one of the most efficient Wave Energy Converters (WECs), characterised by an outstanding Capture Width Ratio (CWR). This study aimed to further enhance the OWSC's CWR through geometric optimisation, employing Smoothed Particle Hydrodynamics (SPH), a high-fidelity numerical modelling technique. Despite its superior ability to handle complex geometries compared to conventional grid-based methods, SPH has not been widely utilised for flap geometry optimisation due to its high computational cost. This study investigated key performance and operational parameters, including the Power Take-Off (PTO) damping coefficient, hydrodynamic forces, and flap dimensions and density. The flow field around the flaps and the resonance frequency’s effect on peak performance were also examined. Based on 398 simulations of various WEC configurations, a novel concave flap shape was identified, delivering a 44% mean efficiency improvement over a wider operational range compared to conventional rectangular flaps. An additional 20% CWR enhancement was achieved within a specific wave frequency range through circular extrusions and surface modifications. With continued optimisation, this novel flap geometry holds significant potential for future OWSC designs and reinforces SPH as a valuable tool for geometry optimisation in wave energy research.</p>

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SPH-based numerical analysis and performance optimisation of an oscillating wave surge converter with a novel flap geometry for efficient wave energy extraction

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • N. H. D. S. Manawadu,
  • L. P. D. D. Liyanage,
  • I. D. Nissanka,
  • H. C. P. Karunasena

摘要

The Oscillating Wave Surge Converter (OWSC) is recognised as one of the most efficient Wave Energy Converters (WECs), characterised by an outstanding Capture Width Ratio (CWR). This study aimed to further enhance the OWSC's CWR through geometric optimisation, employing Smoothed Particle Hydrodynamics (SPH), a high-fidelity numerical modelling technique. Despite its superior ability to handle complex geometries compared to conventional grid-based methods, SPH has not been widely utilised for flap geometry optimisation due to its high computational cost. This study investigated key performance and operational parameters, including the Power Take-Off (PTO) damping coefficient, hydrodynamic forces, and flap dimensions and density. The flow field around the flaps and the resonance frequency’s effect on peak performance were also examined. Based on 398 simulations of various WEC configurations, a novel concave flap shape was identified, delivering a 44% mean efficiency improvement over a wider operational range compared to conventional rectangular flaps. An additional 20% CWR enhancement was achieved within a specific wave frequency range through circular extrusions and surface modifications. With continued optimisation, this novel flap geometry holds significant potential for future OWSC designs and reinforces SPH as a valuable tool for geometry optimisation in wave energy research.