CFD中数值耗散和延伸边界对声传播的影响

赵磊; 乔渭阳

CFD中数值耗散和延伸边界对声传播的影响

赵磊,
乔渭阳

西北工业大学动力与能源学院,西安 710072

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出版历程
- 收稿日期: 2009-11-16
- 修回日期: 2010-05-12
- 刊出日期: 2010-12-28

Effect of numerical dissipation and extended-grid on sound propagation in computational fluid dynamics

School of Power and Energy, Northwestern Polytechnical University,Xian 710072,China

摘要

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.
- 叶轮机噪声 /
- 数值耗散 /
- 边界反射 /
- 延伸网格 /
- 计算流体动力学
Abstract: 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.
- turbomachinery noise /
- numerical dissipation /
- boundary reflection /

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参考文献(12)

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