中文摘要：

在现在的纸，一个新模拟方法与空气通风为不稳定的 cavitating 流动被开发，它为在 hydroturbine 草稿试管减轻压力摆动并且减少 drag 力量在上是很有用的一在水下车辆。因为液体包括三个部件，即，水，蒸汽，和空气，在 waterair 和 watervapor 之间的相互作用被使用表面紧张的水平集合方法，和效果对待在管理方程被考虑。进一步，在水之间的阶段变化和蒸汽被一个同类的模型建模，在空气注射的效果被在集体运输方程使用空气体积部分考虑的地方。为刻度，在柱体车辆附近的 cavitating 流动用建议方法被模仿，并且数字结果与以三个不同通风条件的试验性的数据相比。在模拟和实验之间的成穴进化的好协议显示建议方法为有自然成穴的通气 cavitating 流动的模拟是可接受的并且将为各种各样的工程应用程序可用。而且，涡度分析描绘旋涡是，这很仔细在 cavitating 与成穴进化，和空气注射有关改变涡度生产流动。涡度仅仅与高蒸汽 / 空气体积部分在区域发生了，拉长条款的旋涡创造了大多数涡度，这也被揭示。

英文摘要：

In the present paper, a new simulation method is developed for unsteady cavitating flow with air ventilation, which is very useful for alleviating the pressure oscillation in hydroturbine draft tube and reducing the drag force on an underwater vehicle. Because the fluid includes three compo- nents, i.e., the water, vapor, and air, the interactions between water-air and water-vapor are treated by applying the level set method, and the effect of surface tension is taken into account in governing equations. Further, the phase change between the water and the vapor is modeled by a homogeneous model, where the effect of air injection is considered by applying the air volume fraction in the mass transport equation. For cali- bration, the cavitating flows around a cylinder vehicle were simulated using the proposed method, and the numerical results were compared with the experimental data at three different ventilation conditions. The good agreement of cav- itation evolutions between the simulation and the experiment indicated that the proposed method was acceptable for the simulation of ventilated cavitating flows with nature cavita- tion and would be usable for various engineering applications. Moreover, the vorticity analysis depicts that the vortex is closely related to cavitation evolution, and air injection much changes the vorticity production in cavitating flow. It was also revealed that vorticities only occurred in regions with high vapor/air volume fraction and the vortex stretching term cre- ated the most vorticities.