Prediction of Space-Time Correlations by Large Eddy Simulation

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)
会议录名称	AIAA-2008-1155
	2008
会议名称	46th AIAA Aerospace Sciences Meeting and Exhibit
会议日期	2008-01-07~2008-01-10
会议地点	Reno, Nevada
摘要	The 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.
收录类别	EI
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/44609
专题	力学所知识产出(1956-2008)
通讯作者	He GW(何国威)
推荐引用方式 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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