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Intermittent nature of acceleration in near wall turbulence

Using direct numerical simulation of a fully developed turbulent channel flow, we investigate the behavior of acceleration near a solid wall. We find that acceleration near the wall is highly intermittent and the intermittency is in large part associated with the near wall organized coherent turbule...

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Bibliographic Details
Published in:Physical review letters 2004-04, Vol.92 (14), p.144502-144502, Article 144502
Main Authors: Lee, Changhoon, Yeo, Kyongmin, Choi, Jung-Il
Format: Article
Language:English
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Summary:Using direct numerical simulation of a fully developed turbulent channel flow, we investigate the behavior of acceleration near a solid wall. We find that acceleration near the wall is highly intermittent and the intermittency is in large part associated with the near wall organized coherent turbulence structures. We also find that acceleration of large magnitude is mostly directed towards the rotation axis of the coherent vortical structures, indicating that the source of the intermittent acceleration is the rotational motion associated with the vortices that causes centripetal acceleration.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.144502