摘要
本文采用非线性ｋ－ε紊流模型和Ｎａｏｔ－Ｒｏｄｉ代数应力模型（Ｎ－Ｒ模型）模拟复式断面明渠三维紊流．非线性ｋ－ε模型用张量形式推出，适用于边界形状复杂的流动，而Ｎ－Ｒ模型采用一种补充关系式反映计算点与界面距离对雷诺应力的影响，能较好地反映界面的作用．对一个复式断面明渠实例进行计算，给出了流速场（包括主流、二次流），壁画剪切力和雷诺应力分布，并与实验结果进行详细比较，还研究了浅滩粗糙壁面时的流动，除雷诺应力外，数值计算结果与实测数据基本吻合．
The non-linear k-ε turbulence model and the Naot-Rodi algebraic turbulence stress model capable of predicting flow characteristics in compound channels are described. The former has the advantage of satisfying the tensorial invariance,therefore it is suitable for calculating the geomerically complicated compound channel flows, and the latter is able to account for the effects of the surface on Reynolds stress by using a surface proximity function. A numerical tests are.catried out for an open channel flow with compound section. Detailed ressults of main velocities,secondary velocities, bed stresses and turbulent shear stresses are compared with experimental data. Quite reasonable results are obtained, except for the turbulent shear stresses.
出处
《水利学报》
EI
CSCD
北大核心
1995年第3期52-61,共10页
Journal of Hydraulic Engineering
关键词
复式明渠
断面
紊流
数值模拟
compound open channel, algebraic Reynolds stresses model,secondary flow, shearing mechanisms, turbulents kinetic energy.
