修正PANS模型在非定常空化流动数值计算中的应用与评价  

Application and evaluation of a modified partially-averaged Navier-Stokes turbulence model to simulate the unsteady cavitating flows

作　　者：胡常莉[1] 曹友铨 王学德[1] HU Chang-li;CAO You-quan;WANG Xue-de(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学能源与动力工程学院,南京210094

出　　处：《船舶力学》2018年第11期1333-1341,共9页Journal of Ship Mechanics

基　　金：国家青年科学基金(No.51606097);江苏省青年科学基金(No.BK20150764);中央高校基本科研业务费专项资金资助(No.30916011333)

摘　　要：文章采用一种基于尺度修正的PANS(Partially-Averaged Navier-Stokes)模型对绕Clark-Y型水翼的非定常空化流动进行了数值计算,获得了云状空化形态、速度分布及翼型所受升力随时间的变化情况,并讨论了修正PANS模型的特点。研究结果发现,修正的PANS模型可以较好地模拟云状空化的非定常过程,从翼型前缘空穴的增长到翼型尾部的大空泡团脱落,均与实验结果吻合较好;修正PANS模型针对流场中不同的湍流尺度采用不同的控制参数f_k;修正PANS模型的滤波特性与特征网格尺度的大小有关,特征网格尺度较小时,流场中可以计算出的湍流尺度较丰富,从而可以提高计算精度。A modified PANS(Partially-Averaged Navier-Stokes)model based on the turbulent length scale is applied to simulate the unsteady cavitating flows around a Clark-y hydrofoil.The cloud cavitation shape,the velocity distribution and the lift force of the hydrofoil are obtained and the characteristic of the model is discussed.It is shown that the modified PANS model can predict the unsteady characteristics of cloud cavitating flow well and the process from cavity growth at the front of the foil and sheding at the rear is in a good agreement with the experimental data.The turbulence length scale of the flow is investigated with different values of fk in the modified model.Moreover,the filtering characteristic is related to grid size.The modified model can resolve more turbulent vortex scales with smaller size to improve calculation accuracy.

关 键 词：PANS模型 湍流尺度 控制参数fk值 云状空化 

分 类 号：TV131.32[水利工程—水力学及河流动力学]