摘要
本文采用K-ε模式和SIMPLER算法,对平面和轴对称的绕障碍物的分离流动进行了数值模拟,其中平面情况与有关试验资料进行了对比分析。并从理论上对分离区的紊动特性进行了分析讨论。为了改善数值模拟的结果,对标准K-ε模式中的常数作了适当的修正。在计算方法、边界条件处理等方面,采用了一些新的设想和方法。
This paper studies several typical turbulent flows with seperation by means of K-ε model and SIMPLER algorithm. One flow in a plane channel and another flow in a pipe both are obstructed by its own block. The two flows are simulated. The numerical results of the flows in a plane channel obstructed by a block are compare arid analysed with the present experimental data. The turbulent properties in the separated region are discussed and analysed theoretically. In order to improve the numerical results, the coefficient C_u of the standard K-ε model is adequately modified. New ideas and methods are adopted in the numerical methods and treating of boundary conditions.
关键词
紊流模式
分离
流动
分离区
turdulence model, separated region, turbulent kinetic energy, turbulent dissipation, control-volume method, SIMPLER algorithm
