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Simulation of bubble dynamics oscillating near a circular aperture made in a curved rigid plate using boundary element method

机译：边界元法模拟弯曲刚性板上圆孔附近的气泡动力学

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摘要

The dynamics of a spark-generated bubble oscillating near a circular aperture made in a curved rigid plate is investigated using boundary element method. The influences of the standoff distance and the aperture size on the bubble behavior are studied. Based on the relative value of these parameters, four distinct oscillation scenarios would be recognized: (I) two simultaneous (inward and outward) jets, (II) an inward jet directing towards the opening, (III) quasi or fully spherical oscillation without jet and (IV) an outward jet directing away from the opening. In the scenarios with jet, the jet can be formed in the first oscillation cycle or in the second expansion phase, depending on the standoff distance and opening size. A diagram is provided representing four distinctive regions distinguished by the mentioned four different oscillation scenarios. The results also indicate that the damage caused by an underwater explosion bubble to discontinuous structures might not be as serious as to non perforated structures since the bubble jet would possibly not be formed or this jet is directed away from the opening. The effect of opening on the bubble dynamics might be utilized in the design of the protection tanks on vessel and other practical underwater structures.
机译：使用边界元方法研究了在弯曲的刚性板上制成的圆形孔附近产生火花的气泡的动力学。研究了隔离距离和孔径大小对气泡行为的影响。根据这些参数的相对值，将识别出四种不同的振荡情形：（I）两个同时（向内和向外）射流，（II）朝向开口的向内射流，（III）没有射流的准或全球形振荡（IV）从开口处引出的向外的射流。在带有喷射的情况下，取决于支座距离和开口尺寸，可以在第一振荡周期或第二膨胀阶段形成喷射。提供了表示代表四个不同区域的图，这些区域通过上述四个不同的振荡场景来区分。结果还表明，水下爆炸气泡对不连续结构的破坏可能不如非穿孔结构严重，因为可能不会形成气泡射流或该射流被引向开口。开孔对气泡动力学的影响可用于船舶和其他实际水下结构的保护罐的设计。

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