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中文摘要：
将考虑空化流动密度变化的密度函数引入PANS模型,基于实验结果评价了这种修正的PANS模型在云状空化流动计算中的应用.分别采用不同的模型控制参数f_k值,计算了绕Clark-Y型水翼云状空化流动,获得了空穴形态的发展历程、升力系数曲线波动情况,并与实验结果进行了对比.结果表明,修正PANS模型继承了标准PANS模型的特点,即随着f_k值的减小,可以获得流场中越来越丰富的多相湍流流动细节,很好地预测绕翼型云状空化流动的非定常特性;修正PANS模型考虑了空化区域气液混合介质对湍流黏性的影响,可以更全面地描述反向射流作用下空穴的断裂及多尺度空泡团的脱落细节,所得翼型升力系数曲线的波动情况更接近于实验值.
英文摘要：
To assess a modified PANS model,the cloud cavitating flow around a Clark-y hydrofoil was investigated.The original PANS turbulence model was modified by introducing a density function into turbulence viscosity coefficient considering the vapor and liquid densities in the cavitating region.By simulating the cavitating flow with different values of controls parameter f_k in the modified model,the time evolutions of the cloud cavities,and the lift force of the hydrofoil were obtained and compared with experimental results.The simulation results shown that similar to the original PANS model,the modified one can resolve more turbulent vortex scales with decreasing f_k and predict the unsteady characteristics of cloud cavitating flow well.Moreover,the modified model can accurately obtain the interaction between the cavity and re-entrant jet to capture the process of cavity break-off and shedding with various scales.And the fluctuation of the lift force got from the simulation is close to the experimental data.
同期刊论文项目
同项目期刊论文
Observations and Measurements on Unsteady Cavitating Flows Using A Simultaneous Sampling Approach[J]
Combined experimental and computational investigation of unsteady structure of sheet/cloud cavitatio
Numerical investigation of dynamics of unsteady sheet/cloud cavitating flow using a compressible flu
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