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	A Coarse-Grained LES Model for Turbulent Channel Flow
	Hu, N. ; Liu, H. ; She, Z. S. ; Hussain, F.
	2011
关键词	hybrid RANS/LES method large eddy simulation order functions structural ensemble dynamics channel LARGE-EDDY SIMULATIONS WALL-LAYER MODELS RANS
英文摘要	A hybrid RANS-LES method based on structural ensemble dynamics (SED) theory is presented, wherein coarse-grained turbulent fluctuation amplitudes are re-normalized using instantaneous values of an order function, i.e. mixing length, in the ensemble-averaged Navier-Stokes (EANS) equation. The re-normalization procedure is applied throughout the channel (at wall friction Reynolds numbers Re-tau = 1 050 and 2 000), to evade the common problem of log-layer mismatch. The mean and rms velocity profiles show improved agreement with DNS at very coarse grids (40 x 49 x 20 for both Re's). The method dissipates turbulent kinetic energy in the bulk flow, and increases turbulent fluctuations in the buffer region, mimicking the physical forcing of the sub-grid scale term. The results demonstrate the feasibility to reconstruct the unsteady effect of wall-bounded flows constrained by order functions.; Mechanics; CPCI-S(ISTP); 0
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/316431]
专题	工学院
推荐引用方式 GB/T 7714	Hu, N.,Liu, H.,She, Z. S.,et al. A Coarse-Grained LES Model for Turbulent Channel Flow[C]. 见:.

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