Predictions of canonical wall-bounded turbulent flows via a modified   k-omega equation

doi:10.1080/14685248.2016.1243244

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	Predictions of canonical wall-bounded turbulent flows via a modified k-omega equation
	Chen, Xi ; Hussain, Fazle ; She, Zhen-Su
刊名	JOURNAL OF TURBULENCE
	2017
关键词	Turbulent boundary layers turbulence modelling Reynolds-averaged Navier-Stokes HIGH-REYNOLDS-NUMBER DIRECT NUMERICAL-SIMULATION PIPE-FLOW VON KARMAN LAYER MODEL INTENSITY CHANNEL
DOI	10.1080/14685248.2016.1243244
英文摘要	A major challenge in computation of engineering flows is to derive and improve turbulence models built on turbulence physics. Here, we present a physics-based modified k-omega equation for canonical wall-bounded turbulent flows (boundary layer, channel and pipe), predicting both mean velocity profile (MVP) and streamwise mean kinetic energy profile (SMKP) with high accuracy over a wide range of Reynolds number (Re). The result builds on a multi-layer quantification of wall flows, which allows a significant modification of the k-omega equation. Three innovations are introduced: first, an adjustment of the Karman constant to 0.45 is set for the overlap region with a logarithmic MVP; second, a wake parameter models the turbulent transport near the centreline; third, an anomalous dissipation factor represents the effect of a meso-layer in the overlap region. Then, a highly accurate (above 99%) prediction of MVPs is obtained in Princeton pipes, improving the original model prediction by up to 10%. Moreover, the entire SMKP, including the newly observed outer peak, is predicted. With a slight change of the wake parameter, the model also yields accurate predictions for channels and boundary layers.; National Nature Science Fund [11221062, 11452002]; MOST 973 project [2009CB724100]; SCI(E); ARTICLE; 1; 1-35; 18
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/476332]
专题	工学院
推荐引用方式 GB/T 7714	Chen, Xi,Hussain, Fazle,She, Zhen-Su. Predictions of canonical wall-bounded turbulent flows via a modified k-omega equation[J]. JOURNAL OF TURBULENCE,2017.
APA	Chen, Xi,Hussain, Fazle,&She, Zhen-Su.(2017).Predictions of canonical wall-bounded turbulent flows via a modified k-omega equation.JOURNAL OF TURBULENCE.
MLA	Chen, Xi,et al."Predictions of canonical wall-bounded turbulent flows via a modified k-omega equation".JOURNAL OF TURBULENCE (2017).