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DC Field | Value | Language |
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dc.citation.startPage | 108836 | - |
dc.citation.title | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW | - |
dc.citation.volume | 90 | - |
dc.contributor.author | Choi, Yun Kyung | - |
dc.contributor.author | Lee, Jae Hwa | - |
dc.contributor.author | Hwang, Jinyul | - |
dc.date.accessioned | 2023-12-21T15:37:08Z | - |
dc.date.available | 2023-12-21T15:37:08Z | - |
dc.date.created | 2021-07-27 | - |
dc.date.issued | 2021-08 | - |
dc.description.abstract | Direct numerical simulations of a turbulent Couette-Poiseuille flow with zero-mean-shear at the moving wall (SLflow) is performed to examine flow features compared to those for a turbulent pure Poiseuille flow (P-flow). Profiles of the streamwise mean velocity, indicator function and ratio of production to dissipation show that the logarithmic region is significantly elongated for the SL-flow compared to that for the P-flow at a similar Reynolds number. In addition, the magnitudes of the Reynolds stresses are found to be larger in both inner and outer layers for the SL-flow than those for the P-flow. The spanwise spectra of the production term in the turbulent kinetic energy equation are examined to provide a structural basis for explaining the statistical behaviors. In addition, because the growth of the energy-containing motions extends to the outer layer further for the SL-flow due to the presence of a positive mean shear throughout the entire wall layer, the self-similar behavior of the energy balance between the production and transport terms with respect to the self-similar wavenumber is found far from the wall. We also find the increase in the number of uniform momentum zones in the SL-flow, revealing the hierarchical distribution of the energy-containing eddies which are composed of multiple uniform momentum zones. These coherent motions lead to the elongation of the logarithmic region for the SL-flow. Finally, investigation of the turbulent energy transfer process in a spectral domain for the SL-flow demonstrates importance of outer layer very-long structures, and these structures attribute to the energy transport process in an entire flow field. | - |
dc.identifier.bibliographicCitation | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, v.90, pp.108836 | - |
dc.identifier.doi | 10.1016/j.ijheatfluidflow.2021.108836 | - |
dc.identifier.issn | 0142-727X | - |
dc.identifier.scopusid | 2-s2.0-85107963325 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53300 | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S0142727X21000667?via%3Dihub | - |
dc.identifier.wosid | 000687251600005 | - |
dc.language | 영어 | - |
dc.publisher | ELSEVIER SCIENCE INC | - |
dc.title | Direct numerical simulation of a turbulent plane Couette-Poiseuille flow with zero-mean shear | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | ThermodynamicsEngineering, MechanicalMechanics | - |
dc.relation.journalResearchArea | ThermodynamicsEngineeringMechanics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | Direct numerical simulationCouette-Poiseuille flowTurbulent structure | - |
dc.subject.keywordPlus | LARGE-SCALE MOTIONSBOUNDARY-LAYERSCHANNEL FLOWSPIPEORGANIZATIONAMPLIFICATIONFLUCTUATIONSGROWTHBUDGET | - |
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