Shock wave–thermal inhomogeneity interactions: Analysis and numerical simulations of sound generation
Shock wave–thermal inhomogeneity interactions: Analysis and numerical simulations of sound generation
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DOI：
10.1063/1.870296
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发表时间：
2000
影响因子：
4.6
通讯作者：
F. Grasso;S. Pirozzoli
中科院分区：
文献类型：
--
作者：
F. Grasso;S. Pirozzoli
本文分析了运动平面激波与圆柱热不均匀性的相互作用。由于相互作用，涡度和声波同时产生。本文主要研究了声波的产生和传播及其与冲击强度和非均匀性强度的关系。这个问题的一个声学类比已经形成，作为在弱冲击或弱非均匀性极限下声压场结构比较的基础。为了了解冲击强度和非均匀性强度的影响，进行了广泛的数值研究。结果表明，声场在不受冲击强度和非均匀性强度影响的时间尺度上服从两阶段演化。计算的远场压力与理论结果的比较表明，对于弱非均匀性，无论如何，声学类比都能很好地预测声音。
In the present paper the interaction of a moving planar shock wave with a cylindrical thermal inhomogeneity is analyzed. Due to the interaction, both vorticity and sound waves are generated. The main focus of the paper is on the generation and propagation of the acoustic waves and their dependence on shock strength and inhomogeneity intensity. An acoustic analogy of the problem has been formulated as a basis of comparison for the structure of the acoustic pressure field in the limit of either weak shocks or weak inhomogeneities. An extensive numerical study has been carried out in order to understand the influence of both shock strength and intensity of the inhomogeneity. The results show that the acoustic field obeys a two-stage evolution that occurs on a time scale that is independent of shock and inhomogeneity intensities. The comparison of the computed far-field pressure with the theoretical result shows that for weak inhomogeneities the sound is well predicted by the acoustic analogy regardless of th...