dc.citation.conferencePlace |
US |
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dc.citation.title |
The 69th Annual Meeting of The American Physical Society – Division of Fluid Dynamics |
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dc.contributor.author |
Jeong, Wonguan |
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dc.contributor.author |
Im, Hyoungjae |
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dc.contributor.author |
Lee, Jae Hwa |
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dc.date.accessioned |
2023-12-19T19:38:14Z |
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dc.date.available |
2023-12-19T19:38:14Z |
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dc.date.created |
2017-04-26 |
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dc.date.issued |
2016-11-20 |
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dc.description.abstract |
Direct numerical simulations of temporally decelerating turbulent pipe flows were performed to examine effects of temporal decelerations on turbulence. The simulations were started with a fully developed turbulent pipe flow at a Reynolds number, ReD=24380, based on the pipe radius (R) and the laminar centerline velocity (Uc0). Three different temporal decelerations were imposed to the initial flow with f=|dUb/dt|=0.00127, 0.00625 and 0.025, where Ub is the bulk mean velocity. Comparison of Reynolds stresses and turbulent production terms with those for steady flow at a similar Reynolds number showed that turbulence is highly intensified with increasing f due to delay effects. Furthermore, inspection of the Reynolds shear stress profiles showed that strong second- and fourth-quadrant Reynolds shear stresses are greatly increased, while first- and third-quadrant components are also increased. Decomposition of streamwise Reynolds normal stress with streamwise cutoff wavelength (λx) 1R revealed that the turbulence delay is dominantly originated from delay of strong large-scale turbulent structures in the outer layer, although small-scale motions throughout the wall layer adjusted more rapidly to the temporal decelerations. |
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dc.identifier.bibliographicCitation |
The 69th Annual Meeting of The American Physical Society – Division of Fluid Dynamics |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/39788 |
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dc.identifier.url |
http://meetings.aps.org/Meeting/DFD16/Session/M33.7 |
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dc.language |
영어 |
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dc.publisher |
Americal Physical Society |
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dc.title.alternative |
Effect of temporal deceleration on turbulent pipe flow |
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dc.title |
Turbulent pipe flows subjected to temporal decelerations |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
2016-11-20 |
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