Unsteady cavitating turbulent flow around a NACA66 hydrofoil was simulated using a mass transfer cavitation model and a modified filter-based turbulence model in this paper. The modified filter-based turbulence model can accurately predict the pressure coefficient in midplane and shedding frequency of the unsteady cloud cavitation than standard [Formula: see text]–[Formula: see text] model and filter-based turbulence model. The time evolution of transient cavitation cloud structure predicted by the three-turbulence model was compared. The result which was predicted by the modified filter-based turbulence model is in good agreement with the experimental results. The time evolution of re-entrant jet had been analyzed. The instantaneous wall-pressure evolution on the suction surface (SS) predicted by the modified filter-based turbulence model had been analyzed. The cavitation-vortex interaction had been analyzed in this study. The different effects on the cavitation-vortex interaction of the vortex stretching term, vortex dilatation term and baroclinic torque term in the transport equation of vorticity had been discussed.

中文翻译：

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一种改进的基于滤波器的模型，用于模拟 NACA66 水翼周围的非定常空化流

本文使用传质空化模型和改进的基于过滤器的湍流模型模拟了 NACA66 水翼周围的非定常空化湍流。改进的基于滤波器的湍流模型比标准的[公式：见正文]-[公式：见正文]模型和基于滤波器的湍流模型更能准确预测非定常云空化的中面压力系数和脱落频率。比较了三湍流模型预测的瞬态空化云结构的时间演化。修正后的基于滤波器的湍流模型预测的结果与实验结果吻合较好。对折返射流的时间演化进行了分析。分析了改进的基于过滤器的湍流模型预测的吸力表面（SS）上的瞬时壁压演变。本研究分析了空化-涡流相互作用。讨论了涡量输运方程中涡伸缩项、涡膨胀项和斜压力矩项对空化-涡相互作用的不同影响。