摘要
台阶后回流是一种检验紊流数学模型的典型流动，在许多紊流模型中所采用的处理近壁区问题的壁函数法难以给出满意的结果。本文在对目前各种方法加以分析的基础上，将壁函数法与低雷诺数模型相结合，给出了一种可用于流动分离的近壁区处理方法。该法在保证理论上合理的同时，无须在近壁区布置非常细密的网格。计算结果与实验值基本一致。
The flow over a backwafd facing step is a typical case used to test turbulencemodels. The wall function,which has been employed in many models,is difficult to giveasatisfactorv result.A new calculation method of near-wall region has been advanced.Itcan be used in seperate flows. By this method,the grids near wall need not be veryhne. The calculated results agree with the measured.
关键词
近壁区
数值模拟
湍流模型
回流
turbulence model, near-wall region, numerical simulation
