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Computation of turbulence-generated noise by large-eddy simulation | |
Yao HD(姚华栋); He GW(何国威); Zhang X(张星); Yao HD | |
Source Publication | New Trends In Fluid Mechanics Research - Proceedings Of The Fifth International Conference On Fluid Mechanics |
2007 | |
Pages | 83-86 |
Conference Name | 5th International Conference on Fluid Mechanics |
Conference Date | AUG 15-19, 2007 |
Conference Place | Shanghai, PEOPLES R CHINA |
Abstract | The hybrid method of large eddy simulation (LES) and the Lighthill analogy is being developed to compute the sound radiated from turbulent flows. The results obtained from the hybrid method are often contaminated by the absence of small scales in LES, since the energy level of sound is much smaller than that of turbulent flows. Previous researches investigate the effects of subgrid sacle (SGS) eddies on the frequency spectra of sound radiated by isotropic turbulence and suggest a SGS noise model to represent the SGS contributions to the frequency spectra. Their investigations are conducted in physical space and are unavoidably influenced by boundary conditions. In this paper, we propose to perform such calculations in Fourier space so that the effects of boundary conditions can be correctly treated. Posteriori tests are carried out to investigate the SGS contribution to the sound. The results obtained recover the -7/2 law within certain wave-number ranges, but under-estimate the amplitudes of the frequency spectra. The reason for the underestimation is also discussed. |
Keyword | Sound Radiation Isotropic Turbulence Large Eddy Simulation Lighthill Analogy Isotropic Turbulence Radiated Noise Sound |
WOS ID | WOS:000254042000021 |
Indexed By | CPCI-S |
Language | 英语 |
Citation statistics | |
Document Type | 会议论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/25446 |
Collection | 力学所知识产出(1956-2008) |
Corresponding Author | Yao HD |
Recommended Citation GB/T 7714 | Yao HD,He GW,Zhang X,et al. Computation of turbulence-generated noise by large-eddy simulation[C]New Trends In Fluid Mechanics Research - Proceedings Of The Fifth International Conference On Fluid Mechanics,2007:83-86. |
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