低雷诺数下不同湍流模型和差分格式对典型流场数值模拟预测的影响研究
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摘要
由于湍流理论和数值模拟方法本身的局限,采用CFD来预测低雷诺数的流场本身存在一定的难度,同时各种计算模型的设置对于最后的计算精度也有很大的影响。选用了标准k-ε、RNG k-ε、Realizable k-ε三种常用的湍流模型以及一阶迎风格式、二阶迎风格式、QUICK格式三种常用的差分格式对一个简化的典型流场进行模拟预测,对比分析不同的模拟设置变化对于流场计算结果的影响。
Owing to the limitation of turbulence theory and numerical simulation method, it is difficult to predict the flow field under low Reynolds number by using computational fluid dynamic(CFD). In addition, the calculation setting of the models also has a great influence on the final calculation accuracy. In this present study, the author selected the standard k-ε, RNG k-ε, Realizable k-ε three commonly used turbulence model and the First order Upwind scheme, Second Order Upwind scheme and QUICK scheme three common discretization scheme for simulating a simplified typical flow fields, and then the influence of different simulation settings on the results of flow field calculation were compared and analyzed.
Owing to the limitation of turbulence theory and numerical simulation method, it is difficult to predict the flow field under low Reynolds number by using computational fluid dynamic(CFD). In addition, the calculation setting of the models also has a great influence on the final calculation accuracy. In this present study, the author selected the standard k-ε, RNG k-ε, Realizable k-ε three commonly used turbulence model and the First order Upwind scheme, Second Order Upwind scheme and QUICK scheme three common discretization scheme for simulating a simplified typical flow fields, and then the influence of different simulation settings on the results of flow field calculation were compared and analyzed.
引文
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[11]尹则高,张土乔,黄亚东,等.连续突扩管流的数值模拟[J].流体机械,2005,(8):24-27.
[12]王小华.突扩流的数值模拟[J].低温建筑技术,2003,(1):59-60.
[2]李琼,持田灯,孟庆林,等.建筑室外风环境数值模拟的湍流模型比较[J].华南理工大学学报(自然科学版),2011,(4):121-127.
[3]Kataoka H,Harimoto K,Nozu T,et al.Cooperative project for CFD prediction of pedestrian wind environment in the Architectural Institute of Japan[J].Journal of Wind Engineering&Industrial Aerodynamics,2007,95:1551-1578.
[4]张楚华,谷传纲,苗永淼.利用修正低雷诺数k-ε模型对管道分离流动的数值研究[J].应用力学学报,1998,(2):93-97,148.
[5]陈刚,张月林,高树滋.利用低雷诺数形式的k-ε模型预测管道中的复杂湍流场[J].力学与实践,1991,(4):22-24.
[6]由长福,祁海鹰,徐旭常,等.采用不同湍流模型及差分格式对四角切向燃烧煤粉锅炉内冷态流场的数值模拟[J].动力工程,2001,(2):1128-1131.
[7]赵彬,李先庭,彦启森.用零方程湍流模型模拟通风空调室内的空气流动[J].清华大学学报(自然科学版),2001,(10):109-113.
[8]Launder B E,Spalding D B.The Numerical Computation of Turbulent Flows[J].Computer Methods in Applied Mechanics and Engineering,1974,3:269.
[9]Yakhot V,Orszag S A,Thangam S,et al.Development of Turbulence Models for Shear Flows by a Double Expansion Technique[J].Phys Fluids A,1992,7:1510.
[10]Shih T-H,Liou W-W,Shabbir A,et al.A New Eddy-Viscosity Model for High Reynolds Number Turbulent Flows Model Development and Validation[J].Computers Fluids,1995,3:227.
[11]尹则高,张土乔,黄亚东,等.连续突扩管流的数值模拟[J].流体机械,2005,(8):24-27.
[12]王小华.突扩流的数值模拟[J].低温建筑技术,2003,(1):59-60.