Investigation on the cylindrical bubble dynamics near a wall with an arched bulge

In this paper, the collapse dynamic properties of the cylindrical bubble near an arched cylinder bulge are researched relying on the conformal transformation and Kelvin impulse model. The properties of the liquid velocity distribution, Kelvin impulse distribution and the attraction zone of the jet are analyzed when the bubble and the bulge are arranged symmetrically and asymmetrically. The results show that, firstly, on the side of the bubble close to the bulge, there is a minimum collapse velocity of the bubble surface, which decreases as the bulge angle increases. In addition, the bulge’s effects on the Kelvin impulse strength and direction become larger as the bulge angle increases. When the bubble is incepted at the joint of the flat wall and the bulge, the impulse strength reaches its maximum. Finally, as the bulge angle increases from 45°–120°, the area of the jet attraction zone is gradually expanding, with its maximum width gradually increasing from 1.1–1.8 times the chord length of the bulge.