Heat flux intensification by vortical flow localization in rotating convection

R.P.J. Kunnen, H.J.H. Clercx, B.J. Geurts

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    Abstract

    The effect of rotation on turbulent convective flow between parallel plates has been assessed with direct numerical simulations. With increasing rotation-rate an interesting transition is observed in the vertical-velocity skewness. This transition indicates a localization of motion directed away from the wall and correlates well with changes observed in the heat flux, as well as in the thermal and viscous boundary layer thicknesses. The formation of localized intense vortical structures provides for intensified vertical heat transport through Ekman pumping. At higher rotation-rates this is counteracted by the inhibition of vertical motion by rotation as expressed in the geostrophic thermal-wind balance.
    Original languageEnglish
    Article number056306
    Number of pages4
    JournalPhysical review E: Statistical, nonlinear, and soft matter physics
    Volume74
    Issue number5
    DOIs
    Publication statusPublished - 21 Nov 2006

    Keywords

    • Convection
    • Numerical analysis
    • EWI-9018
    • confined flow
    • Flow simulation
    • METIS-238744
    • IR-63904
    • Boundary layers
    • vortices

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