Turbulence modeling plays a crucial role in simulating unsteady characteristics of cavitation flows. Owing to the different theoretical backgrounds of partially averaged Navier–Stokes (PANS) and filter-based models (FBMs), the differences in their unsteady cavitation flow predictions are worth comparing. In this study, PANS and FBM were used to predict the cloud cavitation regime around a three-dimensional (3D) Clark-Y hydrofoil. Next, the effect of these two models on the cloud cavitation shedding process, shedding frequencies, lift coefficient, and velocity gradient distribution on the foil surface was investigated in detail. The results show that the FBM works only in regions far away from the hydrofoil and hence, yields poor predictions in the near-wall region of the hydrofoil. On the other hand, the PANS formulation does not suffer from the above shortcoming; it could yield reasonable predictions of the unsteady characteristics of cloud cavitation, which were in good agreement with the experimental results reported in the literature.

湍流模型在模拟空化流的不稳定特征中起着至关重要的作用。由于部分平均的Navier-Stokes（PANS）和基于滤波器的模型（FBM）的理论背景不同，因此它们的非定常空化流量预测的差异值得比较。在这项研究中，PANS和FBM用于预测三维（3D）Clark-Y水翼周围的气蚀现象。接下来，详细研究了这两个模型对气蚀空化过程，脱落频率，升力系数和箔表面速度梯度分布的影响。结果表明，FBM仅在远离水翼的区域中起作用，因此，在水翼的近壁区域中预测效果不佳。另一方面，PANS配方不存在上述缺点；它可以对云汽蚀的不稳定特征做出合理的预测，这与文献报道的实验结果非常吻合。