摘要
本文对标准的k-ε两方程模型进行了改进。摒弃了v_t=C_μ(k^2/ε)的假定,而从雷诺应力方程和Rodi的简化假设出发,得出了计算v_t的新表达式(10)。算例表明,它对时均速度u的计算结果比标准k-ε模型更精确。
The standard k- ε two-equation model has been improved in this paper. Getting rid of the supposition of vt = Cu k2/ε , a new expression (10) for calculating the value of vt is derived from Reynolds stress equations and simplified assumption by Rodi. Numerical computations for the flows in straight, single-step expansive, and curved channels have been made. It shows that the improved model requires almost the same computing times as the standard model, however, mean velocities u obtained from the improved model are better agreement with experimental data than those obtained from the standard model.
出处
《空气动力学学报》
CSCD
北大核心
1991年第2期260-264,共5页
Acta Aerodynamica Sinica
关键词
湍流
K-ε湍流模型
通道流动
turbulent flow, k-ε turbulence model, channel flows
