Abstract The initial form of partial cavitation on axisymmetric bodies in some water tunnel tests is a regular system of patches with the approximately constant azimuthal distance between them. The described numerical simulation shows that the origin of such three-dimensional system is in the relatively small non-axisymmetric regular perturbations of the inflow caused by the shapes of non-circular water tunnel cross sections (these sections were squares or hexagons). Computational prediction of cavitation inception number for patch cavitation is carried out by a viscous-inviscid interaction method that combines three-dimensional analysis of inviscid flows with quasi-two-dimensional analysis of viscous flows. Computational results are compared with the experimental data obtained in 1980s in water tunnels of Applied Physics Laboratory and David Taylor Research Center. The satisfactory agreement of computed and measured data is considered as the proof of the described explanation of the origin of patch cavitation.

中文翻译：

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贴片空化的起源

摘要 在一些水洞试验中，轴对称体部分空化的初始形式是一个规则的补丁系统，它们之间的方位角距离近似恒定。所描述的数值模拟表明，这种三维系统的起源是由非圆形水隧道横截面的形状（这些截面是正方形或六边形）引起的相对较小的非轴对称规则扰动。通过将无粘性流动的三维分析与粘性流动的准二维分析相结合的粘性-无粘性相互作用方法，对片状空化的空化起始数进行计算预测。计算结果与 1980 年代在应用物理实验室和大卫泰勒研究中心的水洞中获得的实验数据进行了比较。计算和测量数据的令人满意的一致性被认为是对斑块空化起源的描述解释的证明。