dc.citation.conferencePlace |
US |
- |
dc.citation.title |
70th annual meeting of the APS division of fluid dynamics |
- |
dc.contributor.author |
Lee, Young Mo |
- |
dc.contributor.author |
Lee, Jae Hwa |
- |
dc.date.accessioned |
2023-12-19T17:40:08Z |
- |
dc.date.available |
2023-12-19T17:40:08Z |
- |
dc.date.created |
2017-12-13 |
- |
dc.date.issued |
2017-11-20 |
- |
dc.description.abstract |
Direct numerical simulation of a turbulent Couette flow with two-dimensional (2-D) rod roughness is performed to examine the effects of the surface roughness. The Reynolds number based on the channel centerline laminar velocity (Uco) and channel half height (h) is \textit{Re}=7200. The 2-D rods are periodically arranged with a streamwise pitch of λ=8k on the bottom wall, and the roughness height is k=0.12h. It is shown that the wall-normal extent for the logarithmic layer is significantly shortened in the rough-wall turbulent Couette flow, compared to a turbulent Couette flow with smooth wall. Although the Reynolds stresses are increased in a turbulent channel flow with surface roughness in the outer layer due to large-scale ejection motions produced by the 2-D rods, those of the rough-wall Couette flow are decreased. Isosurfaces of the u-structures averaged in time suggest that the decrease of the turbulent activity near the centerline is associated with weakened large-scale counter-rotating roll modes by the surface roughness. |
- |
dc.identifier.bibliographicCitation |
70th annual meeting of the APS division of fluid dynamics |
- |
dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/38875 |
- |
dc.language |
영어 |
- |
dc.publisher |
American Physical Society |
- |
dc.title |
Surface roughness effects on turbulent Couette flow |
- |
dc.type |
Conference Paper |
- |
dc.date.conferenceDate |
2017-11-19 |
- |