Spatial features of the wall-normal structures in a turbulent boundary layer
Cited 0 times inCited 0 times in
- Spatial features of the wall-normal structures in a turbulent boundary layer
- Lee, Jae Hwa; Lee, Jin; Sung, Hyung Jin
- turbulent boundary layer; turbulent structure; direct numerical simulation
- Issue Date
- TAYLOR & FRANCIS LTD
- JOURNAL OF TURBULENCE, v.12, no.46, pp.1 - 24
- 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.
- ; Go to Link
- Appears in Collections:
- MEN_Journal Papers
- Files in This Item:
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.