摘要
本文提出了模拟湍浮力回流的应力代数模型公式,对浅水渠道中有水平热水出流的各向异性湍浮力回流进行了数值计算,其结果给出了速度、温度、湍动能、湍动能耗散率,各应力分量及热流分布.所得速度及温度分布与修正的k-ε模型(包括对σ_r的经验修正模型)的计算结果,以及实验资料,进行了对比,本计算结果与实测值符合较好,并显示了浮力在铅直方向削弱湍流的作用,因而本模型是更合理的.
An algebraic stress model is formulated to simulate nonisotropic turbulent buoyant recirculating flows in a shallow water channel, into which the heated water is horizontally discharged. Numerical predictions gave the distributions of velocity, temperature, turbulent kinetic energy and its dissipation rate, stress components and heat flux, predicted velocity and temperature profiles are compared with that obtained by the modified k-e mode with and without empirical σT correction and with experiments. The results show good agreement with experiments and logical trend of the reduction of turbulence in vertical direction by buoyancy force. Therefore, the algebraic stress model is considered to be more reasonable and acceptable than previous models.
出处
《力学学报》
EI
CSCD
北大核心
1989年第1期26-34,共9页
Chinese Journal of Theoretical and Applied Mechanics
基金
水利电力部水利水电科学基金的资助
关键词
湍浮力回流
应力代数模型
湍流
an algebraic stress, nonisotropic turbulent buoyant recirculating flows, turbulent energy, dissipation rate.
