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DC Field | Value | Language |
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dc.citation.number | 4 | - |
dc.citation.startPage | 045113 | - |
dc.citation.title | PHYSICS OF FLUIDS | - |
dc.citation.volume | 33 | - |
dc.contributor.author | Kim, Jeong Hyun | - |
dc.contributor.author | Lee, Young Mo | - |
dc.contributor.author | Lee, Jae Hwa | - |
dc.contributor.author | Kim, Jooha | - |
dc.date.accessioned | 2023-12-21T16:07:47Z | - |
dc.date.available | 2023-12-21T16:07:47Z | - |
dc.date.created | 2021-04-01 | - |
dc.date.issued | 2021-04 | - |
dc.description.abstract | When rod surface roughness is introduced in a turbulent Couette-Poiseuille flow (CP-flow), it is known that the Reynolds stresses near the centerline decrease due to weakened very-large-scale motions (VLSMs) and roll-cell motions [Lee, Y. M. et al., "Direct numerical simulation of a turbulent Couette-Poiseuille flow with a rod-roughened wall," Phys. Fluids 30, 105101 (2018)]. In the present study, we examine the origin of the weakened turbulent structures near the centerline in a CP-flow with roughness (CPR-flow) using a dataset from direct numerical simulation. The top-down and bottom-up interactions to organize a CP-flow are very similar to those found in earlier studies in turbulent channel/pipe and boundary layer flows. The circulation of roll-cells in the outer region induces the spanwise congregation of negative streamwise velocity fluctuating structures (u) near the wall, leading to a large-scale ejection into the outer region. This large-scale ejection contributes to the formation of a negative VLSM when two adjacent negative large-scale motions merge, and the VLSM induces the circulation of roll-cell motion due to the pure kinematics. A similar process for the inner-outer interactions is found for a CPR-flow. However, because the impact of the surface roughness suppresses the collective motion of negative u-structures near the surface roughness, strong congregation by roll-cells is observed to occur far from the wall, indicating that relatively few negative u-structures with low strength contribute to the formation of a large-scale ejection for the CPR-flow. The weakened large-scale ejection decreases the strength of the VLSM, resulting in weakened roll-cell motion. | - |
dc.identifier.bibliographicCitation | PHYSICS OF FLUIDS, v.33, no.4, pp.045113 | - |
dc.identifier.doi | 10.1063/5.0043043 | - |
dc.identifier.issn | 1070-6631 | - |
dc.identifier.scopusid | 2-s2.0-85103904219 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/52638 | - |
dc.identifier.url | https://aip.scitation.org/doi/10.1063/5.0043043 | - |
dc.identifier.wosid | 000638120900001 | - |
dc.language | 영어 | - |
dc.publisher | AMER INST PHYSICS | - |
dc.title | Influence of the surface roughness on inner-outer interactions in a turbulent Couette-Poiseuille flow | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Mechanics; Physics, Fluids & Plasmas | - |
dc.relation.journalResearchArea | Mechanics; Physics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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