BROWSE

Related Researcher

Author's Photo

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

ITEM VIEW & DOWNLOAD

Direct numerical simulation of a 30R long turbulent pipe flow at Re=3008

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Direct numerical simulation of a 30R long turbulent pipe flow at Re=3008
Author
Ahn, JunsunLee, Jae HwaLee, JinKang, Ji-hoonSung, Hyung Jin
Issue Date
2015-06
Publisher
AMER INST PHYSICS
Citation
PHYSICS OF FLUIDS, v.27, no.6, pp.065110
Abstract
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/16429
URL
http://scitation.aip.org/content/aip/journal/pof2/27/6/10.1063/1.4922612
DOI
10.1063/1.4922612
ISSN
1070-6631
Appears in Collections:
MEN_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU