Vorticity and turbulence production in pattern recognized turbulent flow structures
作者:
Helmut Eckelmann,
Stavros G. Nychas,
Robert S. Brodkey,
James M. Wallace,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1977)
卷期:
Volume 20,
issue 10
页码: 225-231
ISSN:0031-9171
年代: 1977
DOI:10.1063/1.861734
出版商: AIP
数据来源: AIP
摘要:
A pattern recognition technique has been applied to data obtained in a turbulent channel flow. Theusignal patterns are recognized using several simple criteria, but simultaneously, other signals are processed. A newly designed probe provides, in addition to simultaneousu,v, andwsignals, vorticity signals, &ohgr;zand &ohgr;y, and a signal which can be interpreted as the instantaneous turbulence production,uv(∂U/∂y). The ensemble averaged results provide insight into the vorticity dynamics and turbulence production characteristics of organized structures. The instantaneous turbulent production results show that ejection‐type motions are the principal turbulent energy producers and that the interesting dynamics occur during the acceleration phase of the recognized pattern. A partial model of the flow which explains the results is offered.
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