DES方法模拟空腔流动及噪声分析

Cavity Flow Simulation and Noise Analysis Using DES Method

空腔流动中包含多种复杂的物理现象,一直是流体力学中的一个重要问题。本文研究了三维非定常雷诺平均N-S方程和分离涡模拟(Detached eddy simulation,DES)方法在空腔流动及空腔噪音问题的应用。利用两种方法对三维空腔流动及噪音进行了数值计算并与实验数据进行了对比,通过分析比较发现DES方法得到的结果更加准确,特别是通过声压级(Sound pressure level,SPL)分析发现DES方法能够较好地捕捉空腔流动中的压强脉动及噪声水平,说明DES方法能够有效处理空腔流动问题。

Cavity flow concerns many sophisticated phenomena, which is a key issue in fluid dynamics. The applications of 3-D unsteady Reynolds-averaged Navier-Stokes （URANS） equations and detached eddy simulation （DES） in the simulation of cavity flow are studied. The results of these two methods are analyzed and compared with experimental data. It can be found that results obtained from DES method give better accordance with experimental data, especially sound pressure level （SPL） comparison represents DES method can obtain a relatively accurate pressure fluctuations of cavity flow. It is con- cluded that for cavity flow, DES method is superior to URANS.