Large-eddy simulation of multiscale particle dynamics at high volume concentration in turbulent channel flow

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    Abstract

    Large-eddy simulations (LES) of a'vertical turbulent channel flow laden with a large number of solid point particles are discussed. This flow is relevant for a better understanding of co·current turbulent gas-particle flows. as encountered in riser reactors. The particle volume fraction is chosen to be high, it equals about 1.3%. This necessitates the use of a four-way coupling model for the discrete particle dynamics. The Euler-Lagrangian method is adopted, which means that the fluid dynamics is governed by the Navier-Stokes equations and that the motion of individual particles is tracked by solving their equation of motion, taking both theparticle-fluid and particle-particle interactions into account. LES results are compared to single·phase channel flow to investigate the effect of the particles on turbulent statistics. Due 10 particle-fluid interactions the mean fluid profile is flattened and the boundary layer is thinner. Compared to single-phase turbulent flow, the streamwise turbulence intensity of the gas phase is increased, while the normal and spanwise turbulence intensities are reduced, as is also observed in experimental data. The four-way coupled simulations are also compared with twoway coupled simulations. in which the inelastic collisions between particles are neglected. The latter comparison demonstrates that the collisions have a large influence on the main statistio;,s of both phases. expressed for example by the stronger coherent particle structures observed in four·way coupling.
    Original languageEnglish
    Title of host publicationMultiscale Methods in Computational Mechanics
    Subtitle of host publicationProgress and Accomplishments
    EditorsRené de Borst, Ekkehard Ramm
    Place of PublicationDordrecht
    PublisherSpringer
    Pages95-113
    Number of pages19
    ISBN (Electronic)978-90-481-9809-2
    ISBN (Print)978-90-481-9808-5
    DOIs
    Publication statusPublished - 2011
    EventInternational Colloquium on Multiscale Methods in Computational Mechanics, MMCM 2009 - Rolduc, Netherlands
    Duration: 11 Mar 200913 Mar 2009

    Publication series

    NameLecture Notes in Applied and Computational Mechanics
    PublisherSpringer
    Volume55
    ISSN (Print)1613-7736
    ISSN (Electronic)1860-0816

    Conference

    ConferenceInternational Colloquium on Multiscale Methods in Computational Mechanics, MMCM 2009
    Abbreviated titleMMCM
    CountryNetherlands
    CityRolduc
    Period11/03/0913/03/09

    Keywords

    • Large eddy simulation
    • Channel flow
    • Particle-laden turbulence
    • Four-way coupling

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