PANS模型在空化湍流数值计算中的应用  

Application of the partially-averaged Navier-Stokes method in computations of turbulent cavitating flows

作　　者：黄彪[1] 王国玉[1] 权晓波 陈广豪[1] 

机构地区：[1]北京理工大学,北京100081 [2]北京宇航系统工程研究所,北京100076

出　　处：《应用力学学报》2011年第4期339-343,448-449,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50979004)

摘　　要：采用一种基于标准k-ε模型改进的局部时均化模型(Partially-Averaged Navier-Stokes Model,PANS),并应用于空化流动计算。控制不同的模型参数,分别对绕平头轴对称回转体和Clark-Y型水翼的空化流动进行模拟,并与实验结果进行对比。结果表明:PANS模型中未分解湍动能比率fk的取值对预测空化流动的数值计算精度有重要影响,改变fk的取值可实现对不同滤波尺度范围内的求解;随着fk值的减小PANS的预测精度逐步提高,能在相对较大范围内求解较小尺度的湍流运动过程中,预测到湍流运动中强烈的非定常特性;同时可以比较准确地预测空化流场结构和动力特性。Since the complexity of turbulent flow,it is difficult to show accurate prediction for the engineering applications by the common turbulence models.Turbulence problems are the major challenge of predicting cavitating flows.Partially-Averaged Navier-Stokes model(PANS) is a new approach to simulate turbulence flow.The model is evaluated in steady cavitating flow over a blunt body revolution and unsteady cavitating flow around a Clark-Y hydrofoil,respectively.The influence of unresolved-to-total ratio of kinetic energy fk on simulation accuracy and how to decide the value of fk are investigated.It is demonstrated that more turbulence are resolved with the decreasing fk,in addition,the results seem more plausible.Also,it is shown that PANS model is able to capture unsteady phenomena including cavity shedding and cavity dynamics more accurately and predicts a range of cavitating flows better.

关 键 词：PANS模型 空化流动 湍流 未分解湍动能比率 数值计算 

分 类 号：TV131.32[水利工程—水力学及河流动力学]