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COMPARISON OF DIFFERENT PHYSICAL MODELS FOR THE SIMULATION OF CAVITATING FLOWS AROUND A HYDROFOIL

机译:不同物理模型对水膜周围空气流动模拟的比较

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The simulation of cavitating flow is a difficult task, due to the large density ratio between liquid and vapor phases. Investigation of currently known cavitation and turbulence models and their mutual interaction can be a significant asset to improving their performance. Several previous works present results on cavitating flows obtained by various physical models, that mainly differ by the treatment of the mass transfer calculation between vapor and liquid phases. In this study different cavitation models have been implemented in a commercial, general-purpose CFD code (Fluent), and numerical results were compared to experimental ones. Different turbulence models have been also compared, in particularly, to improve numerical simulations by taking into account the influence of the compressibility of two-phase medium on turbulence, a modified k-e RNG model and compared with the standard model. The simulations were carried out on 2D hydrofoil with an Eppler E817 cross section. The inception cavitation number, the cavity length and the pressure coefficients have been compared with the experimental data.
机译:由于液态和蒸汽相之间的密度比具有较大的密度比,空化流动的模拟是困难的任务。对目前已知的空化和湍流模型的调查及其相互互动可以是提高其性能的重要资产。几个以前的作品存在导致通过各种物理模型获得的空化流量,主要是通过治疗蒸气和液相之间的传质计算的差异。在这项研究中,不同的空化模型已经在商业,通用CFD码(流利)中实现,并将数值结果与实验结果进行了比较。还已经比较了不同的湍流模型,特别是通过考虑两相介质对湍流的压缩性,改进的K-E RNG模型并与标准模型进行比较来改善数值模拟。模拟在2D水翼上进行,具有E817横截面。与实验数据进行了比较了初始空化数,腔长和压力系数。

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