Direct numerical simulation of turbulent rotating Rayleigh-Bénard convection

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

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    Abstract

    The influence of rotation on turbulent convection is investigated with direct numerical simulation. The classical Rayleigh-Benard con guration is augmented with steady rotation about the vertical axis. Correspondingly, characterisation of the dynamics requires both the dimensionless Rayleigh number $Ra$ and the Taylor number $Ta$. With increasing $Ta$ the root-mean-square (rms) velocity variations are found to decrease, while the rms temperature variations increase. Under rotation a mean vertical temperature gradient develops in the bulk. Compared to the non-rotating case, at constant $Ra = 2.5\,10^6$ the Nusselt number increases up to approximately 5% at relatively low rotation rates, $Ta < Ta_m \approx 10^6$, and decreases strongly when $Ta$ is further increased. A striking change in the boundary layer structure arises when $Ta$ traverses an interval about $Ta_m$, as is expressed by the near-wall vertical-velocity skewness.
    Original languageEnglish
    Title of host publicationDirect and Large-Eddy Simulation VI
    EditorsEric Lamballais, Rainer Friedrich, Bernard J. Geurts, Olivier Métais
    Place of PublicationBerlin, Germany
    PublisherSpringer
    Pages233-240
    Number of pages8
    ISBN (Electronic)978-1-4020-5152-4
    ISBN (Print)978-1-4020-4909-5
    DOIs
    Publication statusPublished - Oct 2006
    Event6th ERCOFTAC Workshop on Direct and Large-Eddy Simulation VI, DLES 2005 - University of Poitiers, Poitiers, France
    Duration: 12 Sep 200514 Sep 2005
    Conference number: 6

    Publication series

    NameERCOFTAC series
    PublisherSpringer
    Volume10
    ISSN (Print)1382-4309
    ISSN (Electronic)2215-1826

    Conference

    Conference6th ERCOFTAC Workshop on Direct and Large-Eddy Simulation VI, DLES 2005
    Abbreviated titleDLES
    CountryFrance
    CityPoitiers
    Period12/09/0514/09/05

    Keywords

    • Nusselt number
    • Rayleigh number
    • Direct numerical simulation
    • Rotation rate
    • Taylor number

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