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<p>Cloud cavitation induces intense underwater radiation noise, with complex spectral characteristics that remain insufficiently understood. This study explores the underlying mechanisms through experiments and simulations on a twisted hydrofoil. Beyond the well-known harmonic tones linked to cavity shedding frequency, two key spectral characteristics were identified: a series of lock-in frequency features and a consistent high-frequency decay rate. Experimental and numerical results reveal that tunnel acoustic modes and hydrofoil structural modes contribute to the lock-in features at their respective natural frequencies, while the collapse of cascaded microscale bubbles drives the regular high-frequency noise decay at a rate of −4 dB/octave. These findings contribute to a deeper understanding of cloud cavitation noise, and provide valuable insights for modifying existing cavitation noise prediction models.</p>

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New insights into cloud cavitation noise spectrum

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Xincheng Wang,
  • Mingtai Song,
  • Huaiyu Cheng,
  • Bin Ji,
  • Mohamed Farhat

摘要

Cloud cavitation induces intense underwater radiation noise, with complex spectral characteristics that remain insufficiently understood. This study explores the underlying mechanisms through experiments and simulations on a twisted hydrofoil. Beyond the well-known harmonic tones linked to cavity shedding frequency, two key spectral characteristics were identified: a series of lock-in frequency features and a consistent high-frequency decay rate. Experimental and numerical results reveal that tunnel acoustic modes and hydrofoil structural modes contribute to the lock-in features at their respective natural frequencies, while the collapse of cascaded microscale bubbles drives the regular high-frequency noise decay at a rate of −4 dB/octave. These findings contribute to a deeper understanding of cloud cavitation noise, and provide valuable insights for modifying existing cavitation noise prediction models.