DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chongsiripinyo, Karu | - |
dc.contributor.author | You, Donghyun | - |
dc.date.accessioned | 2019-04-07T18:52:33Z | - |
dc.date.available | 2019-04-07T18:52:33Z | - |
dc.date.created | 2018-03-19 | - |
dc.date.issued | 2018-02 | - |
dc.identifier.issn | 1738-494X | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/96070 | - |
dc.description.abstract | Direct numerical simulations (DNS) are performed to investigate the effect of the interface position of water-air flow on turbulence statistics and flow structures in wall-bounded water-air turbulent flow through a straight channel. Water depths of 90 and 180 viscous wall units, referred to as shallow-water and deep-water cases, respectively, are examined. Water-to-air density and viscosity ratios of 831.7 and 55.56 are considered to model a realistic flow condition at temperature of 25 oC and pressure of 1 atm. The Reynolds number and Froude number are set to 180 and 1.22 x 10(-4), respectively, for both shallow-water and deep-water case, based on the friction velocity at the bottom wall, the half depth of the channel, and water density and viscosity. The Navier-Stokes equations are solved using a timesplitting projection method on an octree grid structure, while the deformation of the interface between water and air is computed using a volume-of-fluid method. With the presence of the water-air interface, velocity profiles in deep-water and shallow-water cases are found to slightly deviate from the log-law profile for a single phase turbulent flow in a channel. The deviation is magnified when the interface is placed closer to the log-law region. Turbulent velocity fluctuations in the water stream are found to be associated with quasi-streamwise vortices and hairpin vortices. The quasi-streamwise vortices which are attached close to the wall are found in both deep-water and shallow-water cases. However, the hairpin vortices of which leading portions are lifted away from the wall are found to be diminished in the shallow-water case while they are clearly observed in the deep-water case. | - |
dc.language | English | - |
dc.publisher | KOREAN SOC MECHANICAL ENGINEERS | - |
dc.relation.isPartOf | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | - |
dc.title | Effects of the interface position of water-air flow on turbulent wall structures | - |
dc.type | Article | - |
dc.identifier.doi | 10.1007/s12206-018-0116-2 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.32, no.2, pp.689 - 695 | - |
dc.identifier.kciid | ART002313128 | - |
dc.identifier.wosid | 000425325700016 | - |
dc.citation.endPage | 695 | - |
dc.citation.number | 2 | - |
dc.citation.startPage | 689 | - |
dc.citation.title | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | - |
dc.citation.volume | 32 | - |
dc.contributor.affiliatedAuthor | You, Donghyun | - |
dc.identifier.scopusid | 2-s2.0-85042285897 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | DIRECT NUMERICAL-SIMULATION | - |
dc.subject.keywordPlus | FREE-SURFACE TURBULENCE | - |
dc.subject.keywordPlus | FULLY-DEVELOPED TURBULENCE | - |
dc.subject.keywordPlus | LARGE-EDDY SIMULATION | - |
dc.subject.keywordPlus | OPEN-CHANNEL FLOW | - |
dc.subject.keywordPlus | ADAPTIVE SOLVER | - |
dc.subject.keywordPlus | VORTEX | - |
dc.subject.keywordAuthor | Water-air flow | - |
dc.subject.keywordAuthor | Turbulent wall structures | - |
dc.subject.keywordAuthor | Direct numerical simulation | - |
dc.subject.keywordAuthor | Volume-of-fluid | - |
dc.relation.journalWebOfScienceCategory | Engineering, Mechanical | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.description.journalRegisteredClass | kci | - |
dc.relation.journalResearchArea | Engineering | - |
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