雷诺应力对平均和脉动压力影响的数值模拟

Numerical Simulation of Reynolds Stresses Influence on Mean and Fluctuation Pressure

采用增加雷诺应力边界条件方法考察了雷诺应力对流场的影响。当雷诺应力边界条件存在时,流场内平均和脉动压力的变化体现了雷诺应力的影响。本文首先在没有雷诺应力边界条件和有雷诺应力边界条件的情况下得到TTU低矮建筑标准模型表面的平均压力系数,结果表明:考虑雷诺应力可使建筑物表面的平均压力系数的绝对值增大。本文还利用Selvam提出的脉动压力系数数学模型,计算了TTU模型表面的脉动压力系数,并对计算结果进行了分析。

The influence of Reynolds stresses on the flow was investigated by considering boundary condition of Reynolds stresses. When the boundary condition existed, the changes of the mean and fluctuation pressure coefficients reflect the influence of Reynolds stresses. The mean pressure coefficients of TTU low building standard model were obtained with and without the existing of boundary condition of Reynolds stresses. The numerical results show that the norm value of mean pressure coefficients becomes larger when considering Reynolds stresses. By the virtue of mathematic model proposed by Selvam, the fluctuation pressure coefficients of TTU model were calculated and the results were analyzed.