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dc.contributor.authorJayaram, Rohith
dc.contributor.authorJie, Yucheng
dc.contributor.authorZhao, Lihao
dc.contributor.authorAndersson, Helge Ingolf
dc.date.accessioned2021-03-08T15:11:56Z
dc.date.available2021-03-08T15:11:56Z
dc.date.created2021-02-19T08:54:55Z
dc.date.issued2020
dc.identifier.citationPhysics of Fluids. 2020, 32 (4), .en_US
dc.identifier.issn1070-6631
dc.identifier.urihttps://hdl.handle.net/11250/2732246
dc.description.abstractClustering of inertial spheres in a statistically unsteady flow field is believed to be different from particle clustering observed in statistically steady flows. The continuously evolving three-dimensional Taylor–Green vortex (TGV) flow exhibits time-varying length and time scales, which are likely to alter the resonance of a given particle with the evolving flow structures. The tendency of homogeneously introduced spherical point-particles to cluster preferentially in the TGV flow is observed to depend on the particle inertia, parameterized in terms of the particle response time τp. The degree of the inhomogeneity of the particle distribution is measured by the variance σ2 of Voronoï volumes. The time evolution of the particle-laden TGV flow is characterized by a viscous dissipation time scale τd and the effective Stokes number Steff = τp/τd. Particles with low/little inertia do not cluster in the early stage when the TGV flow only consists of large-scale and almost inviscid structures and Steff < 1. Later, when the large structures have been broken down into smaller vortices, the least inertial particles exhibit a stronger preferential concentration than the more inertial spheres. At this stage, when the viscous energy dissipation has reached its maximum level, the effective Stokes number of these particles has reached the order of one. Particles are generally seen to cluster preferentially at strain-rate dominated locations, i.e., where the second invariant Q of the velocity gradient tensor is negative. However, a memory effect can be observed in the course of the flow evolution where high σ2 values do not always correlate with Q < 0.en_US
dc.language.isoengen_US
dc.publisherAmerican Institute of Physicsen_US
dc.titleClustering of inertial spheres in evolving Taylor-Green vortex flowen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.pagenumber13en_US
dc.source.volume32en_US
dc.source.journalPhysics of Fluidsen_US
dc.source.issue4en_US
dc.identifier.doihttps://doi.org/10.1063/5.0002406
dc.identifier.cristin1818804
dc.description.localcodeThis is the authors’ accepted and refereed manuscript to the article. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Applied Physics and may be found at http://dx.doi.org/10.1063/5.0002406en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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