Influence of grid resolution on the spectral characteristics of noise radiated from turbulent jets: Sound pressure fields and their decomposition
Influence of grid resolution on the spectral characteristics of noise radiated from turbulent jets: Sound pressure fields and their decomposition
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网格分辨率对湍流射流辐射噪声频谱特性的影响：声压场及其分解
DOI：
10.1016/j.compfluid.2019.104343
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发表时间：
2020
影响因子：
2.8
通讯作者：
Angelino M
中科院分区：
文献类型：
--
作者：
Angelino M
在可预见的未来，喷气噪声仍然是飞机降噪的关键目标。虽然极具挑战性，但预测低频和高频噪声频谱的要求对于设计目的越来越重要。需要新的方法来克服目前的数值限制，在捕捉所需的广泛的噪声频谱。一旦充分解决，能量含量的数值模拟的近场和远场声压具有内在的相关性之间的不同级别的网格分辨率。目前的工作探讨了新的潜力，这种相关性，以扩大光谱预测。采用大涡模拟方法研究了高亚音速湍流射流辐射噪声。本文在500万~ 8000万网格点的多分辨率网格上，对轴对称喷管和锯齿喷管进行了三维可压缩Navier-Stokes方程的数值计算。辐射的远场声使用Ffowcs威廉姆斯-霍金斯（FW-H）表面积分法计算。压力近场的傅立叶分解被应用于帮助识别声源区域的位置和主要的传播方向，这提供了一个更透彻的理解网格分辨率的影响的数值截止频率的远场频谱。远场频谱和它们的方位角模式的进一步分析证实，一种新的策略，以获得一个扩大的整体声谱是可能的，在降低计算成本，从多个频谱的组合，从连续细化网格。
Jet noise remains a key target for aircraft noise reduction in the foreseeable future. While being extremely challenging, the requirement of predicting both low and high frequency noise spectra is increasingly important for design purposes. Novel approaches are needed to overcome the current numerical limitations in capturing the required broad noise spectra. Once sufficiently resolved, the energy contents of the numerically simulated near- and far-field sound pressure have intrinsic correlations among different levels of grid resolution. The present work explores the novel potential of such correlations to broaden the spectral prediction. The noise radiated from high subsonic turbulent jets is investigated using large-eddy simulation. The 3-D filtered compressible Navier-Stokes solutions are obtained for an axisymmetric and a serrated nozzle on successively refined multi-resolution grids, ranging from 5 to 80 million grid points. The radiated far-field sound is computed using the Ffowcs Williams – Hawkings (FW-H) surface integral method. Fourier decomposition for pressure near-field is applied to help identify the location of the sound source regions and the dominant directions of propagation, which provides a more thorough understanding of the effect of the grid resolution on the numerical cut-off frequencies of the far-field spectra. Further analysis of the far-field spectra and of their azimuthal modes confirms that a novel strategy to obtain a broadened overall sound spectrum is possible, at reduced computational cost, from a combination of multiple spectra from successively refined grids.
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V 形喷嘴射流近喷嘴区域噪声产生的模拟
影响因子：
2.5
作者：
A. Uzun;M. Y. Hussaini
通讯作者：
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具有有限跨度襟翼几何形状和飞行流的已安装超高涵道比同轴喷气气动声学的 LES-RANS - 第 1 部分：圆形喷嘴
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
J. Tyacke;Zhong;P. Tucker
通讯作者：
P. Tucker
使用大涡模拟预测喷气噪声的匹配混合方法
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Guillaume Bodard;C. Bailly
通讯作者：
C. Bailly
DOI：
10.1080/10407782.2016.1139986
发表时间：
2016-05
期刊：
Numerical Heat Transfer, Part A: Applications
影响因子：
--
作者：
A. Boghi;M. Angelino;F. Gori
通讯作者：
A. Boghi;M. Angelino;F. Gori
影响因子：
2.5
作者：
B. Callender;E. Gutmark;S. Martens
通讯作者：
B. Callender;E. Gutmark;S. Martens