声波与剪切流作用的数值模拟

Numerical Simulation of Mixing Layer Effect on Sound Waves

基于完整的可压缩流体力学方程 ,利用特征分析的方法给出了气动声学中数值计算扰动的边界处理方法。采用所提出的边界处理方法 ,模拟了静止流场、不同来流速度的均匀流场及均匀剪切流场中扰动的演化 ,结果表明 :给出的边界条件的处理方法是合适的。文中还模拟了混合层中扰动的演化 。

Based on the integrated compressible fluid mechanics equations, using eigen value analysis, the new method of non-reflecting boundary condition was proposed for aeroacoustics simulation of disturbance in shear flows. With the new boundary conditions, the disturbance were simulated in static fluid, uniform flows and uniform shear flows, and the results show that the new boundary conditions given in this paper are appropriate. The evolvement of disturbance in compressible mixing layer was also simulated, and the transmitted characteristic of disturbance in compressible mixing layer was presented.