Knowledge Management System of Institue of Mechanics, CAS
| Multiscale Method for Turbulent-Flow Computations | |
Shen YQ(申义庆) ; Gao Z(高智); Zhuang FG(庄逢甘)
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| Source Publication | Proceedings of the Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics, 2004 |
| 2004-09-05 | |
| Conference Name | Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics, Sept. 5-10, 2004, Beijing, China |
| Abstract | 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. |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/13926 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Shen YQ(申义庆) |
| Recommended Citation 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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