Imperial College London
Alternate

Dr. Yongyun Hwang

Faculty of Engineering, Department of Aeronautics

Reader in Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5078y.hwang

 
 
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Location

 

337City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hwang:2015:10.1017/jfm.2015.24,
author = {Hwang, Y},
doi = {10.1017/jfm.2015.24},
journal = {Journal of Fluid Mechanics},
pages = {254--289},
title = {Statistical structure of self-sustaining attached eddies in turbulent channel flow},
url = {http://dx.doi.org/10.1017/jfm.2015.24},
volume = {767},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The linear growth of the spanwise correlation length scale with the distance from the wall in the logarithmic region of wall-bounded turbulent flows has been understood as a reflection of Townsend’s attached eddies. Based on this observation, in the present study, we perform a numerical experiment, which simulates energy-containing motions only at a given spanwise length scale in the logarithmic region, using their self-sustaining nature found recently. The self-sustaining energy-containing motions at each of the spanwise length scales are found to be self-similar with respect to the given spanwise length. Furthermore, their statistical structures are consistent with those of the attached eddies in the original theory, providing direct evidence on the existence of Townsend’s attached eddies. It is shown that a single self-sustaining attached eddy is composed of two distinct elements, one of which is a long streaky motion reaching the near-wall region, and the other is a relatively short vortical structure carrying all the velocity components. For the given spanwise length
AU  - Hwang,Y
DO  - 10.1017/jfm.2015.24
EP  - 289
PY  - 2015///
SN  - 1469-7645
SP  - 254
TI  - Statistical structure of self-sustaining attached eddies in turbulent channel flow
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2015.24
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/statistical-structure-of-selfsustaining-attached-eddies-in-turbulent-channel-flow/9BCC29294F777AD6A47B3E9DD8AFC734
UR  - http://hdl.handle.net/10044/1/31422
VL  - 767
ER  -
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