Behavior of cavitation bubble collapse near the hemisphere on a flat wall

作者：Jinsen Hu, Xin Wu, Jialu Wang, Zhifeng Wang, Weiqi Wang, Tianzhen Ju, Yuning Zhang, Yuning Zhang · 发表于：Physics of Fluids · 年份：2025 · DOI：10.1063/5.0271807 · 被引用次数：4 · 研究领域：Ultrasound and Cavitation Phenomena、Cavitation Phenomena in Pumps、Nuclear Physics and Applications

This study investigates the behaviors of a cavitation bubble in the vicinity of a hemisphere on a flat wall using a numerical solver of the OpenFOAM platform. First, the typical collapse behavior of the cavitation bubble is analyzed by examining the evolution of the pressure and temperature fields. Second, the spatial–temporal evolution of temperature along the symmetry axis of the cavitation bubble and the variations in temperature and pressure at the hemisphere vertex are analyzed. Finally, the influence of the stand-off distance and hemisphere radius on collapse behavior is discussed. From the numerical results, four distinct cases of collapse behavior are identified, and these cases are associated with the hemisphere radius and the stand-off distance. As the jet impinges on the hemisphere vertex, the temperature at the vertex initially rises due to the high temperature generated when the jet pierces the bubble and then decreases because of the low-temperature liquid within the jet. For a hemisphere with a small radius, the jet undergoes deflection upon impact, which then causes the cavitation bubble to fragment into two or three annular bubbles.