【摘要】 应用4种湍流模型对绕水翼空化流动进行模拟。通过与水洞实验数据实测数据的对比,研究了不同湍流模型在空化流动计算中的预测能力。模拟结果表明:DES(Detached Eddy Simulation)模型所预测的水翼表面压力系数与实验结果最为接近;标准k-ε模型、RNG k-ε模型、Realizablek-ε模型在流场分离区内的预测结果均与实测结果存在较大偏差,其中又以标准k-ε模型的偏差最大。在非定常空化流计算中,DES模型所计算的升力系数显示了强烈的时间依赖性,升力系数波动范围最大;而标准k-ε模型、RNG k-ε模型、Realizable k-ε模型这三种模型所计算的升力系数波动范围不大。更多还原

【Abstract】 Four turbulence models are adopted to simulate cavitating flow around the hydrofoil. Compared with water tunnel experimental data, the precision of each model to simulate cavitating flow is investigated. The simulation results show that the surface pressure coefficient on the hydrofoil predicted by DES(Detached Eddy Simulation)model is the closest to that measured in water tunnel experiment, while the standard k-ε model, RNG k-ε model, Realizable k-ε model give less accurate prediction about the surface pressure coefficient in the detached zone,with the prediction from the standard k-ε model having the largest deviation from the experimental data. During the simulation of unsteady flow, the lift coefficient predicted by DES model shows a strong time-dependent behavior, and fluctuates in a large range. However, the lift coefficient predicted by three other models only fluctuate in a small range.更多还原