摘要
对已知色散关系的正弦波在二维管道中的传播使用有限体积法进行计算,结果表明二阶精度下每波长40个左右的网格点能够有效地保留声波.在计算域外增加稀疏网格延伸段能够对边界反射起到抑制作用,为以较小的计算量增加实现较好的反射抑制效果,研究给出了延伸段长度和网格轴向尺寸的推荐公式.
A sinusoidal acoustic wave with known dispersion-relation was propagated through a two-dimensional duct using a finite-volume scheme,showing that a rough estimate of around 40 points per wavelength under second order accuracy was sufficient to preserve the wave.Adding an extended coarse grid out of the computational region could reduce the unwanted boundary reflection.A guideline of the extended-grid's length and axial size for the good effect of absorbing the boundary reflection with less computation was provided.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2010年第12期2716-2720,共5页
Journal of Aerospace Power
关键词
叶轮机噪声
数值耗散
边界反射
延伸网格
计算流体动力学
turbomachinery noise
numerical dissipation
boundary reflection
extended-grid
computational fluid dynamics(CFD)