用K-ε模式理论确定湍流压力脉动的均方值

Determination of turbulent pressure fluctuation with K-ε model theory

应用Ｋ－ε模式理论导出了一般剪切湍流中压力脉动的均方值与湍流动能Ｋ，湍流耗散ε及雷诺应力 ｕｉｕｊ的关系．利用谱分析方法所确定的关系式中的待定系数，计算了湍流边界层的压力脉动，并同已有数据进行了比较。分析与计算结果表明，该方法是可行的，从而为湍流压力脉动的预测提供了一种计算手段．

Based on the K-ε model analysis, a turbulence model for mean square value of pressure fluctuation is proposed, which expresses p2in terms of turbulence energy K, dissipation ε, Renolds stress ujuj and mean flow velocity gradient. Pressure fluctuation in turbulent boundary layer is computed and compared with experimental and simulated data. With this model, a com-puting approach can be provided to determine pressure fluctuation in turbulent shear flow.