Autogeneration of near‐wall vortical structures in channel flow
作者:
Jigen Zhou,
Ronald J. Adrian,
S. Balachandar,
期刊:
Physics of Fluids
(AIP Available online 1996)
卷期:
Volume 8,
issue 1
页码: 288-290
ISSN:1070-6631
年代: 1996
DOI:10.1063/1.868838
出版商: AIP
数据来源: AIP
摘要:
The evolution of a symmetric pair of quasistreamwise vortical structures extracted from the two‐point correlation tensor of turbulent channel flow data by a linear stochastic estimation procedure is studied through direct numerical simulation. It is observed that an &OHgr;‐shaped hairpin vortex is formed quickly from this initial structure. Sufficiently strong hairpin vortices are observed to generate a hierarchy of secondary hairpin vortices, and the mechanism of their creation closely resembles the formation of the primary hairpin vortex. New streamwise vortices are also generated, and this process provides a means for a few vortical disturbances of adequate strength to reproduce themselves and eventually populate the near‐wall layer. ©1996 American Institute of Physics.
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