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<p>A parabolic coast or wall concentrates incoming waves at its focal point, creating a high‑energy zone ideal for enhanced capture. Yet, how to efficiently harvest this concentrated energy remains unclear. Here we propose designs of single- and dual-chamber Oscillating Water Column (OWC) chambers for enhancing wave energy capture. A time‑domain higher‑order boundary element method, grounded in nonlinear potential flow theory, is coupled with a nonlinear pneumatic model—calibrated via geometric scaling, dual‑chamber coupling, and focused‑wave boundary tests—to simulate OWC performance. Under parabolic focusing, a bimodal resonance yields peak power absorption up to 17 times that of an isolated device, and a leeward perforation design boosts the single‑chamber capture ratio to 25 times baseline. A dual‑chamber configuration with an added semicircular chamber further elevates total absorbed energy and widens the effective bandwidth. This work provides practical design guidance for efficient wave-energy devices operating in focused-wave environments.</p>

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Enhancing energy capture: single- and dual-chamber oscillating water column devices under converging waves

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月10日

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  • Yu Zhou,
  • Zhigao Wang,
  • Jing Geng

摘要

A parabolic coast or wall concentrates incoming waves at its focal point, creating a high‑energy zone ideal for enhanced capture. Yet, how to efficiently harvest this concentrated energy remains unclear. Here we propose designs of single- and dual-chamber Oscillating Water Column (OWC) chambers for enhancing wave energy capture. A time‑domain higher‑order boundary element method, grounded in nonlinear potential flow theory, is coupled with a nonlinear pneumatic model—calibrated via geometric scaling, dual‑chamber coupling, and focused‑wave boundary tests—to simulate OWC performance. Under parabolic focusing, a bimodal resonance yields peak power absorption up to 17 times that of an isolated device, and a leeward perforation design boosts the single‑chamber capture ratio to 25 times baseline. A dual‑chamber configuration with an added semicircular chamber further elevates total absorbed energy and widens the effective bandwidth. This work provides practical design guidance for efficient wave-energy devices operating in focused-wave environments.