四种湍流模型对空化流动模拟的比较

Comparison and analysis of computed results for cavitating flow with four turbulence models

采用四种湍流模型对NACA66水翼空化流动进行模拟,分析了不同湍流模型和壁面函数对空化流动模拟结果的影响。分析结果表明:ASM模型和RNGk-ε模型对空化数不敏感,且计算精度较高;Realizablek-ε模型对空化数的变化很敏感,对不同的空化数计算精度相差很大;标准k-ε模型对空化数不敏感,但精度不高。增强壁面函数法对空化数不敏感,计算精度较高;标准壁面函数法和非平衡壁面函数法对空化数有一定的敏感性,但计算结果差异不大。

Four different turbulence models are used to simulate the cavitating flow around a hydrofoil （NACA66）, and the influence of turbulence models on the computational results is analyzed. The computed and analyzed results show that： the ASM model and the RNG κ-ε model are more stable than the Realizable κ-ε model and accurate than the standard κ-ε model with the change of cavitation number, and the enhanced wall function is more stable and more accurate than the standard wall function and the non-equilibrium wall function.