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The Dynamic Behavior Of A Gas Bubble Near A Wall

机译：壁附近气泡的动态行为

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In this paper, a numerical model based on the potential flow theory is established to simulate the interaction of a gas bubble with a nearby wall. The time-integration boundary integral method is used to solve the dynamics of a gas bubble. With this method the numerical calculations show an excellent agreement with the experimental data. Employing the numerical code based on the presented algorithm, the dynamics of a gas bubble close to a rigid wall is investigated systematically, especially the relationship between various characteristic parameters and the Bjerknes effect due to the presence of a nearby wall. It is found that Blake's criterion, which is usually used to predict the direction of the bubble jet, has a great degree of accuracy for the bubble relatively far away from the wall and bubble near a wall, there is a significant error, attributed to its simplifications and assumptions. Further studies show that an oblique jet will be formed when a bubble close to an inclined wall collapses, direction and width of which have a close relationship with the characteristic parameters used to characterize the bubble. For the bubble near a horizontal wall, a liquid jet pointing directly to the wall is developed generally when the Bjerknes attraction and buoyancy are in the same direction; and at the same time, if the Bjerknes attraction is in the opposite direction of buoyancy, the direction of the jet will depend on a criterion. Then the interaction of gas bubble between complicated walls of some a submarine is also studied, which shows the most dangerous induced loading condition of structure in water, and the evidently effects of bubble jet on loading. The special phenomena mentioned above have a great significance for the further study on the interaction of the bubble with its boundaries.
机译：在本文中，建立了基于势流理论的数值模型来模拟气泡与附近壁的相互作用。时间积分边界积分法用于求解气泡动力学。用这种方法，数值计算与实验数据显示出极好的一致性。利用基于所提出算法的数字代码，系统地研究了靠近刚性壁的气泡的动力学，尤其是由于附近壁的存在，各种特征参数与Bjerknes效应之间的关系。发现通常用于预测气泡射流方向的布雷克准则对于相对远离壁的气泡和靠近壁的气泡具有很高的准确性，这是由于其误差较大。简化和假设。进一步的研究表明，当靠近倾斜壁的气泡坍塌时，会形成倾斜射流，其方向和宽度与用于表征气泡的特征参数密切相关。对于水平壁附近的气泡，通常在Bjerknes吸引力和浮力方向相同时会形成直接指向壁的液体射流。同时，如果Bjerknes吸引力的浮力方向相反，则射流的方向将取决于标准。然后，研究了某潜艇复杂壁之间的气泡相互作用，表明了水中结构最危险的诱导加载条件，并且气泡喷射对加载的影响明显。上述特殊现象对于进一步研究气泡与其边界的相互作用具有重要意义。

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