Ahn, Junsun
Lee, Jae Hwa
Lee, Jin
Kang, Ji-hoon
Sung, Hyung Jin
2015-09-01T06:19:44Z
2015-07-08
2015-06
PHYSICS OF FLUIDS, v.27, no.6, pp.065110
1070-6631
https://scholarworks.unist.ac.kr/handle/201301/16429
A direct numerical simulation of a turbulent pipe flow at a high Reynolds number of Re-tau = 3008 over a long axial domain length (30R) was performed. The stream-wise mean velocity followed the power law in the overlap region (y(+) = 90-300; y/R = 0.03-0.1) based on the power law indicator function. The scale separation of the Reynolds shear stresses into two components of small-and large-scale motions (LSMs) revealed that the LSMs in the outer region played an important role in constructing the constant-stress layer and the mean velocity. In the pre-multiplied energy spectra of the streamwise velocity fluctuations, the bimodal distribution was observed at both short and long wavelengths. The k(x)(-1) region associated with the attached eddies appeared in lambda(x)/R = 2-5 and lambda(x)/y = 18-160 at y(+) = 90-300, where the power law was established in the same region. The k(z)(-1) region also appeared in lambda(z)/R = 0.3-0.6 at y(+) = 3 and 150. Linear growth of small-scale energy to large-scale energy induced the k(x)(-1) region at high Reynolds numbers, resulting in a large population of the LSMs. This result supported the origin of very-large-scale motions in the pseudo-streamwise alignment of the LSMs. In the pre-multiplied energy spectra of the Reynolds shear stress, the bimodal distribution was observed without the k(x)(-1) region.
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AMER INST PHYSICS
Direct numerical simulation of a 30R long turbulent pipe flow at Re=3008
ARTICLE
1783
21571
000357688800047
ART
0
2016-02-05
10.1063/1.4922612
http://scitation.aip.org/content/aip/journal/pof2/27/6/10.1063/1.4922612