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<p>Based on the high-speed photography experimental platform and open source software OpenFOAM, the collapse behavior of the cavitation bubble adjacent to a large-curvature convex wall is investigated. The influence of the wall-bubble dimensionless distance on the bubble collapse cases, jet characteristics, and vortex evolution is analyzed. The findings reveal that: (1) As the dimensionless wall-bubble distance <i>γ</i> increases, the collapse jet presents three typical cases: the single jet away from the wall, the single jet towards the wall, and the double jets. (2) The high-pressure region formed during bubble collapse transitions from the inferior lateral region to the bubble circumference as <i>γ</i> increases. (3) The vortex dynamics during bubble rebound are strongly dependent on the dimensionless distance <i>γ</i>. The wall-bound vortices that dominate at larger <i>γ</i> are caused by the rebound bubble impacting the wall.</p>

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Investigation of jet characteristics and vortex dynamics induced by bubble collapsing near a convex wall

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Jing-yin Zhang,
  • Qi Liang,
  • Yu-hang Liu,
  • Ya-bin Liu,
  • Shan Xu,
  • Ke-xin Wang,
  • Yu-ning Zhang

摘要

Based on the high-speed photography experimental platform and open source software OpenFOAM, the collapse behavior of the cavitation bubble adjacent to a large-curvature convex wall is investigated. The influence of the wall-bubble dimensionless distance on the bubble collapse cases, jet characteristics, and vortex evolution is analyzed. The findings reveal that: (1) As the dimensionless wall-bubble distance γ increases, the collapse jet presents three typical cases: the single jet away from the wall, the single jet towards the wall, and the double jets. (2) The high-pressure region formed during bubble collapse transitions from the inferior lateral region to the bubble circumference as γ increases. (3) The vortex dynamics during bubble rebound are strongly dependent on the dimensionless distance γ. The wall-bound vortices that dominate at larger γ are caused by the rebound bubble impacting the wall.