A study of the turbulence structures of wall-bounded shear flows
A study of the turbulence structures of wall-bounded shear flows
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壁面剪切流湍流结构的研究
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
B. Cantwell
中科院分区：
文献类型：
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作者：
M. S. Chong;J. Soria;A. Perry;J. M. Chacin;Y. Na;B. Cantwell
该项目利用Chong等人发展的涡旋运动的拓扑性质扩展了对壁面边界流结构的研究。(1990)，Soria et al.(1992,1994)，最近由Blackburn等人扩展。(1996)和查辛等人。(1996年)。在这些工作中，通过被速度梯度张量判别式的正小值的等值面包围来识别本质上是焦点的流动区域。这些区域类似于Theodorsen(1955)最先提出的附加涡环。这样的环路被结合在Perry&Chong(1982)，Perry等人的附加涡流模型版本中。(1986)和Perry&Marusic(1995)，它们是由Townsen(1976)首先提出的模型的扩展。本文所研究的壁面有界流的数值模拟数据来自Spalart(1988)的零压力梯度流动和Na&Moin(1996)的分离再附着边界层。流动结构是从附加的涡旋假说的观点来考察的。
This project extends the study of the structure of wall-bounded flows using the topological properties of eddying motions as developed by Chong et al. (1990), Soria et al. (1992, 1994), and as recently extended by Blackburn et al. (1996) and Chacin et al. (1996). In these works, regions of flow which are focal in nature are identified by being enclosed by an isosurface of a positive small value of the discriminant of the velocity gradient tensor. These regions resemble the attached vortex loops suggested first by Theodorsen (1955). Such loops are incorporated in the attached eddy model versions of Perry & Chong (1982), Perry et al. (1986), and Perry & Marusic (1995), which are extensions of a model first formulated by Townsend (1976). The DNS data of wall bounded flows studied here are from the zero pressure gradient flow of Spalart (1988) and the boundary layer with separation and reattachment of Na & Moin (1996). The flow structures are examined from the viewpoint of the attached eddy hypothesis.