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<p>The present study uses OpenFOAM to simulate jet evolution during a cavitation bubble collapse above a concave wall. The generation mechanism and velocity characteristics of the needle jet are principally explored. Concurrently, the shock wave diffusion in the field and pressure fluctuation at the feature point are comprehensively analyzed. As a comparison, the regular jet cases near the concavity are also investigated, and the parameter range for producing needle jets is explored. The major findings are as follows: 1) When the non-dimensional distance between the bubble centroid and wall is less than 1.2, an extremely thin and high-speed needle jet is generated near the concavity. 2) The needle jet velocity is 10 times that of a regular jet. Combined with the effect of the shock wave and the needle jet, the pressure peak at the feature point can reach 40 times that of a regular jet. 3) The neck formed by the evolution of large curvature bubble walls under the influence of vortices is the key factor in the formation of the needle jet.</p>

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Numerical investigation of the needle jets produced by cavitation bubbles near a concave wall

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Yuhang Liu,
  • Yifan Liu,
  • Jingfei Duan,
  • Jinsen Hu,
  • Yuning Zhang,
  • Xiaoyu Wang,
  • Dan Gao,
  • Yuning Zhang

摘要

The present study uses OpenFOAM to simulate jet evolution during a cavitation bubble collapse above a concave wall. The generation mechanism and velocity characteristics of the needle jet are principally explored. Concurrently, the shock wave diffusion in the field and pressure fluctuation at the feature point are comprehensively analyzed. As a comparison, the regular jet cases near the concavity are also investigated, and the parameter range for producing needle jets is explored. The major findings are as follows: 1) When the non-dimensional distance between the bubble centroid and wall is less than 1.2, an extremely thin and high-speed needle jet is generated near the concavity. 2) The needle jet velocity is 10 times that of a regular jet. Combined with the effect of the shock wave and the needle jet, the pressure peak at the feature point can reach 40 times that of a regular jet. 3) The neck formed by the evolution of large curvature bubble walls under the influence of vortices is the key factor in the formation of the needle jet.