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dc.contributor.authorPu, Jaan H.*
dc.contributor.authorTait, Simon J.*
dc.contributor.authorGuo, Yakun*
dc.contributor.authorHuang, Y.*
dc.contributor.authorHanmaiahgari, P.R.*
dc.date.accessioned2017-11-09T11:58:43Z
dc.date.available2017-11-09T11:58:43Z
dc.date.issued2018-04
dc.identifier.citationPu JH, Tait S, Guo Y et al (2018) Dominant features in three-dimensional turbulence structure: comparison of non-uniform accelerating and decelerating flows. Environmental Fluid Mechanics. 18(2): 395-416.en_US
dc.identifier.urihttp://hdl.handle.net/10454/13738
dc.descriptionYesen_US
dc.description.abstractThe results are presented from an experimental study to investigate three-dimensional turbulence structure profiles, including turbulence intensity and Reynolds stress, of different non-uniform open channel flows over smooth bed in subcritical flow regime. In the analysis, the uniform flow profiles have been used to compare with those of the non-uniform flows to investigate their time-averaged spatial flow turbulence structure characteristics. The measured non-uniform velocity profiles are used to verify the von Karman constant κ and to estimate sets of log-law integration constant Br and wake parameter П, where their findings are also compared with values from previous studies. From κ, Br and П findings, it has been found that the log-wake law can sufficiently represent the non-uniform flow in its non-modified form, and all κ, Br and П follow universal rules for different bed roughness conditions. The non-uniform flow experiments also show that both the turbulence intensity and Reynolds stress are governed well by exponential pressure gradient parameter β equations. Their exponential constants are described by quadratic functions in the investigated β range. Through this experimental study, it has been observed that the decelerating flow shows higher empirical constants, in both the turbulence intensity and Reynolds stress compared to the accelerating flow. The decelerating flow also has stronger dominance to determine the flow non-uniformity, because it presents higher Reynolds stress profile than uniform flow, whereas the accelerating flow does not.en_US
dc.description.sponsorshipMajor State Basic Research Development Grant No. 2013CB036402.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1007/s10652-017-9557-5en_US
dc.rightsThe Author(s) 2017. This article is an open access publication. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.en_US
dc.subjectNon-uniform flow; Accelerating flow; Decelerating flow; Uniform flow; Smooth bed; Turbulence intensity; Reynolds stress; Turbulence structureen_US
dc.titleDominant features in three-dimensional turbulence structure: comparison of non-uniform accelerating and decelerating flowsen_US
dc.status.refereedYesen_US
dc.date.Accepted2017-10-30
dc.date.application2017-11-06
dc.typeArticleen_US
dc.type.versionPublished versionen_US
refterms.dateFOA2018-07-30T01:19:51Z


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