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Lee, Jae Hwa
Flow Physics and Control Lab
Research Interests
  • Turbulent Flow Physics and Control
  • Incompressible and Compressible Flows
  • Fluid-Structure Interaction
  • Multi-Phase Flow with Heat Transfer

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Spatial features of the wall-normal structures in a turbulent boundary layer

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Title
Spatial features of the wall-normal structures in a turbulent boundary layer
Author
Lee, Jae HwaLee, JinSung, Hyung Jin
Keywords
turbulent boundary layer; turbulent structure; direct numerical simulation
Issue Date
2011-11
Publisher
TAYLOR & FRANCIS LTD
Citation
JOURNAL OF TURBULENCE, v.12, no.46, pp.1 - 24
Abstract
Coherent wall-normal structures in a turbulent boundary layer (TBL) have been investigated by scrutinizing a direct numerical simulation (DNS) dataset with Re-theta = 2500. It was found that groups of hairpin legs induce wall-normal-aligned structures and these large-scale regions are mostly induced by the combination of the attached and detached vortical structures. By using the feature extraction algorithm, we found that more than approximately 60% of the attached momentum regions extend beyond the log region, while most of the detached regions formed locally away from the wall have relatively short wall-normal extent. The two-point correlation of the streamwise velocity fluctuations showed that the wall-normal length scales vary linearly with the distance from the wall, and, finally, the two-point correlations between the signed swirling motions showed that interactions between counterrotating vortices are predominant throughout the boundary layer and especially frequent in the near-wall region.
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DOI
10.1080/14685248.2011.627860
ISSN
1468-5248
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