Direct numerical simulation of horizontal convection driven by differential heating

B. Gayen, R. W. Griffiths, G. O. Hughes, J. A. Saenz

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    A numerical study based on three-dimensional direct numerical simulations are performed to investigate horizontal thermal convection in a long channel at a large Rayleigh number, Ra. Differential thermal forcing is applied at the bottom boundary over two equal regions. The steady-state circulation is achieved after the net heat flux from the boundary becomes zero. A stable thermocline forms above the cooled base and is advected over the heated part of the base, confining small-scale three-dimensional convection to the heated base and end wall region. At the endwall a narrow turbulent plume rises through the full depth of the channel. The less energetic return flow is downward in the interior, upon which eddy motions are imposed. This work, for the first time, focuses on the three dimensional instabilities and structures of the flow. The conversions of mechanical energy are examined in different regions of the flow (boundary layer, plume and interior) and help to understand overall circulation dynamics.

    Original languageEnglish
    Title of host publicationProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012
    EditorsP.A. Brandner, B.W. Pearce
    PublisherAustralasian Fluid Mechanics Society
    ISBN (Electronic)9780646583730
    Publication statusPublished - 2012
    Event18th Australasian Fluid Mechanics Conference, AFMC 2012 - Launceston, Australia
    Duration: 3 Dec 20127 Dec 2012

    Publication series

    NameProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012

    Conference

    Conference18th Australasian Fluid Mechanics Conference, AFMC 2012
    Country/TerritoryAustralia
    CityLaunceston
    Period3/12/127/12/12

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