基于校准k-ε模型的复杂地形流动数值模拟  

Numerical Simulations of Flow Within Complex Terrain Based on Calibrated k-εModel

作　　者：刘文[1] 王晓东[1] 闫姝[2] 史绍平[2] LIU Wen;WANG Xiao-Dong;YAN Shu;SHI Shao-Ping(Key Laboratory of of Power Plant Energy Transfer Conversion and System,Alinistry of Education,North China Electric Power University,Beijing 102206,China;China Huaneng Group Clean Energy Technology Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]华北电力大学“电站能量传递转化与系统”教育部重点实验室,北京102206 [2]中国华能集团清洁能源技术研究院有限公司,北京102209

出　　处：《工程热物理学报》2021年第2期377-385,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876063)。

摘　　要：准确计算风电场的内部流动对风电场的微观选址至关重要。求解雷诺平均NS方程(RANS)的模拟是当前模拟风电场内部流动的主要手段。湍流模型对模拟结果的准确性有很大影响。选取在工程中广泛应用的标准k-ε湍流模型进行研究。首先以平板地形为计算模型,探究入口边界条件、壁面方程、模型可调参数和对模拟流向均匀大气边界层的影响,获得平板地形下最优的模型可调参数设置。然后以三维山丘地形为计算模型,研究入口边界条件和源项对存在分离流动时复杂地形下的绕流模拟的影响。将得到的最优结果同实验结果对比,验证模拟方法的可行性,并给出添加源项的指导方法。Accurate calculation of the internal flow of wind farm is very important to the micro-site selection of the wind farm.Reynolds Averaged Navier-Stokes(RANS)simulation is still the main method to investigate the internal flow of wind turbine.Turbulence model is an important factor affecting the accuracy of RANS simulations.In this paper,the standard k-εturbulence model,which is widely used in engineering,is selected for studies.The inlet boundary condition,the wall equation,the adjustable parameters of the model and the influence on the simulated flow direction uniform atmospheric boundary layer are studied,and the optimal adjustable parameters of the model are obtained.Then,the effects of inlet boundary conditions and source terms on the flow around complex terrain in the presence of separated flow are studied.The computational results with optimized model are compared with the experimental results,and the feasibility of the simulation method is verified.The conclusions can be used as guidance of additional source term.

关 键 词：复杂地形 CFD模拟 k-ε模型 模型参数 源项 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]