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- W2038632334 abstract "The recently increasing application of large eddy simulation to unsteady problems [1], suchnas turbulence-generated sound and turbulent reacting flows, requires that large-eddy simulation n (LES) with a sub-grid scale (SGS) model could accurately predict space-time correlations. Mostnof the currently existing SGS models are based on the energy budget equations. Therefore, theynare able to correctly predict energy spectra at large scales, but they may not accurately predictnother statistical quantities that are not determined fully by large-scale energy spectra, such asnspace-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 turbulencenchannel 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. Innturbulence-generated sound, according to Lighthill's theory, the acoustic intensity radiated bynturbulent 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 powernin LES is also discussed. n" @default.
- W2038632334 created "2016-06-24" @default.
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- W2038632334 date "2008-01-07" @default.
- W2038632334 modified "2023-10-18" @default.
- W2038632334 title "Prediction of Space-Time Correlations by Large Eddy Simulation" @default.
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- W2038632334 doi "https://doi.org/10.2514/6.2008-1155" @default.
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