IMECH-IR  > 力学所知识产出(1956-2008)
Prediction of Space-Time Correlations by Large Eddy Simulation
He GW(何国威); Yao HD(姚华栋); Zhao X(赵星); He GW(何国威)
Source PublicationAIAA-2008-1155
Conference Name46th AIAA Aerospace Sciences Meeting and Exhibit
Conference Date2008-01-07~2008-01-10
Conference PlaceReno, Nevada
AbstractThe recently increasing application of large eddy simulation to unsteady problems [1], such as turbulence-generated sound and turbulent reacting flows, requires that large-eddy simulation  
(LES) with a sub-grid scale (SGS) model could accurately predict space-time correlations. Most of the currently existing SGS models are based on the energy budget equations. Therefore, they are able to correctly predict energy spectra at large scales, but they may not accurately predict other statistical quantities that are not determined fully by large-scale energy spectra, such as space-time correlations. In this paper, we will investigate the effects of SGS modeling on space-time correlations in LES. The numerical simulations of isotropic turbulence [2, 3] and turbulence channel flows [4] show that, compared with the results of direct numerical simulation (DNS), LES under-predicts the un-normalized correlation magnitude and over-predict the decorrelation time scales. This can lead to inaccurate solutions in applications such as sound power spectra. In turbulence-generated sound, according to Lighthill's theory, the acoustic intensity radiated by turbulent flows depends on two-point, two-time correlations, or Eulerian space-time correlations. Therefore, an accurate calculation of the Eulerian space-time correlation is important to the prediction of the sound radiations. The application of space-time correlations to acoustic power in LES is also discussed.  
Indexed ByEI
Document Type会议论文
Corresponding AuthorHe GW(何国威)
Recommended Citation
GB/T 7714
He GW,Yao HD,Zhao X,et al. Prediction of Space-Time Correlations by Large Eddy Simulation[C]AIAA-2008-1155,2008.
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