Calculation of sound generation and radiation from instationary flows
Calculation of sound generation and radiation from instationary flows
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计算静止流的声音产生和辐射
DOI：
10.1016/j.compfluid.2005.03.005
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发表时间：
2006
影响因子：
2.8
通讯作者：
A. Wilde
中科院分区：
文献类型：
--
作者：
A. Wilde
对低马赫数流动的格子-玻尔兹曼方法(LBM)在流动声学中的应用进行了评价。通过线性化和von-Neumann分析，导出了在平均流存在时低振幅声波的相速度和衰减精度的定量度量。结果表明，在模拟空气中可听到的频率范围内的声波时，只有相位误差是相关的。对于二维9bit模型和三维19bit模型，只要波的分辨率为每个波长至少34(12)个点，相速误差就不超过0.1%(1%)。将LBM应用于掠流中亥姆霍兹谐振器的问题和后缘噪声的产生问题。结果清楚地证明了再现相关流动声学效果的能力。
The Lattice–Boltzmann method (LBM) for simulation of low Mach number flows is evaluated for the application in flow acoustics. By linearization and von-Neumann analysis quantitative measures for the accuracy of phase speed and attenuation of low amplitude sound waves in presence of a mean flow are derived. It is shown that only phase errors are relevant when simulating sound waves in the audible frequency range in air. For the two dimensional 9bit model and the three dimensional 19bit model the phase speed error is below 0.1% (1%) as long as the wave is resolved with at least 34 (12) points per wavelength. The LBM is applied to the problem of a Helmholtz resonator under a grazing flow and to the trailing edge noise generation problem. The results clearly demonstrate the ability to reproduce relevant flow acoustic effects.