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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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