Multiscale Method for Turbulent-Flow Computations

IMECH-IR > 力学所知识产出(1956-2008)

	Multiscale Method for Turbulent-Flow Computations
	Shen YQ(申义庆); Gao Z(高智); Zhuang FG(庄逢甘)
会议录名称	Proceedings of the Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics, 2004
	2004-09-05
会议名称	Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics, Sept. 5-10, 2004, Beijing, China
摘要	A main method of predicting turbulent flows is to solve LES equations, which was called traditional LES method. The traditional LES method solves the motions of large eddies of size larger than filtering scale An while modeling unresolved scales less than Delta_n. Hughes et al argued that many shortcomings of the traditional LES approaches were associated with their inabilities to successfully differentiate between large and small scales. One may guess that a priori scale-separation would be better, because it can predict scale-interaction well compared with posteriori scale-separation. To this end, a multi-scale method was suggested to perform scale-separation computation. The primary contents of the multiscale method are l) A space average is used to differentiate scale. 2) The basic equations include the large scale equations and fluctuation equations. 3) The large-scale equations and fluctuation equations are coupled through turbulent stress terms. We use the multiscale equations of n=2, i.e., the large and small scale (LSS) equations, to simulate 3-D evolutions of a channel flow and a planar mixing layer flow Some interesting results are given.
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/13926
专题	力学所知识产出(1956-2008)
通讯作者	Shen YQ(申义庆)
推荐引用方式 GB/T 7714	Shen YQ,Gao Z,Zhuang FG. Multiscale Method for Turbulent-Flow Computations[C]Proceedings of the Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics, 2004,2004.

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