基于局部时均Navier-Stokes模型的分域计算方法  

Domain Computing Method Based on Partially-averaged Navier-Stokes Turbulence Model

作　　者：罗倩 胡常莉[1] LUO Qian;HU Changli(School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《兵工学报》2021年第1期100-107,共8页Acta Armamentarii

基　　金：国家自然科学青年科学基金项目(51606097)。

摘　　要：基于标准局部时均Navier-Stokes模型中控制参数fk的取值特点,提出一种基于分域思想的计算方法。针对不同的流域采用不同的f_(k)值,实现在同一个计算流域设置不同湍流模型的效果。应用该方法分别计算绕方柱的单相流动和绕Clark-y水翼的非定常空化流动,并将计算结果与相应实验结果进行对比。结果表明:数值计算得到的方柱表面压力系数分布以及流场中不同截面处的速度分布均与实验结果吻合较好;新方法可以很好地捕捉到Clark-y水翼吸力面空穴形态随时间的演化过程,以及水翼升力系数随时间的波动规律。A partially-averaged Navier-Stokes(PANS)method is proposed to calculate different regions of flow field with different values of f_(k),which imposes the different turbulence models to be set at the same time.The proposed method is applied to simulate the single-phase flow around the two-dimensional square cylinder and the unsteady cavitating flows around Clark-y hydrofoil,respectively.The modified PANS model well predicts the pressure coefficient distributions on the surface of square cylinder and the velocity distribution at different sections of flow field.In addition,it can well capture the time evolutions of the cavities around the Clark-y hydrofoil and the fluctuation of lift coefficient of hydrofoil.

关 键 词：局部时均Navier-Stokes模型 分域计算 方柱绕流 非定常空化 

分 类 号：TV131.32[水利工程—水力学及河流动力学]