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DC Field | Value | Language |
---|---|---|
dc.citation.number | 10 | - |
dc.citation.startPage | 105101 | - |
dc.citation.title | PHYSICS OF FLUIDS | - |
dc.citation.volume | 30 | - |
dc.contributor.author | Lee, Young Mo | - |
dc.contributor.author | Kim, Jung Hoon | - |
dc.contributor.author | Lee, Jae Hwa | - |
dc.date.accessioned | 2023-12-21T20:09:36Z | - |
dc.date.available | 2023-12-21T20:09:36Z | - |
dc.date.created | 2018-10-26 | - |
dc.date.issued | 2018-10 | - |
dc.description.abstract | A direct numerical simulation of a fully developed turbulent Couette-Poiseuille flow with a rod-roughened wall is performed to investigate the impact of the surface roughness on the flow characteristics compared to the influence of the roughness on a turbulent Poiseuille flow. Transverse rods are periodically arranged on the bottom wall with a streamwise pitch of p = 8k. The roughness height is k = 0.12h, where h is the channel half-height. The mean velocity profile shows that the logarithmic layer of a turbulent Couette-Poiseuille flow is significantly shortened by surface roughness, although that of a turbulent Poiseuille flow with surface roughness is increased. In addition, the Reynolds stresses for the Couette-Poiseuille flow with rod roughness are decreased in the outer layer, contrary to the observation of a turbulent Poiseuille flow with rod roughness. The decomposition of the Reynolds stresses into small- and large-scale motions confirms that the large-scale features dominantly contribute to the decrease of the Reynolds stresses in the outer layer. Although a large-scale counter-rotating roll mode is observed through temporally averaged streamwise fluctuating structures, the roll mode for the Couette-Poiseuille flow over a rough wall is significantly inhibited by the surface roughness due to weakened high- and low-streaky patterns near the centerline. The energy spectrum of the streamwise velocity fluctuations shows that the surface roughness contributes mainly to organizing the entire flow field; thus, the large-scale features observed in a turbulent Couette-Poiseuille flow are significantly suppressed with little interaction between the inner and outer layers. | - |
dc.identifier.bibliographicCitation | PHYSICS OF FLUIDS, v.30, no.10, pp.105101 | - |
dc.identifier.doi | 10.1063/1.5049173 | - |
dc.identifier.issn | 1070-6631 | - |
dc.identifier.scopusid | 2-s2.0-85054488844 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/25057 | - |
dc.identifier.url | https://aip.scitation.org/doi/10.1063/1.5049173 | - |
dc.identifier.wosid | 000448975800034 | - |
dc.language | 영어 | - |
dc.publisher | AMER INST PHYSICS | - |
dc.title | Direct numerical simulation of a turbulent Couette-Poiseuille flow with a rod-roughened wall | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Mechanics; Physics, Fluids & Plasmas | - |
dc.relation.journalResearchArea | Mechanics; Physics | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | LOW-REYNOLDS-NUMBER | - |
dc.subject.keywordPlus | CHANNEL FLOW | - |
dc.subject.keywordPlus | BOUNDARY-LAYER | - |
dc.subject.keywordPlus | SQUARE BARS | - |
dc.subject.keywordPlus | ROUGHNESS | - |
dc.subject.keywordPlus | VELOCITY | - |
dc.subject.keywordPlus | STATISTICS | - |
dc.subject.keywordPlus | SMOOTH | - |
dc.subject.keywordPlus | REGIME | - |
dc.subject.keywordPlus | DNS | - |
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