Abstract Three-dimensional buoyancy driven flows in vertical cylinders are simulated with a finite difference technique. Asymmetric convective flows are studied for three values of the (length-to-radius) aspect ratio A. One result concerns the occurrence of asymmetric convection in a flat A=0.485 cylinder for Pr=6.7, near the threshold and up to 3Ra c (where Ra c is the critical Rayleigh number and Pr is the Prandtl number). Complex (steady and time-dependent) supercritical regimes have been simulated in cylinders of aspect ratios A=2 and A=4 for Pr=0.02 and in ranges of Ra up to 8Ra c and 6Ra c, respectively. The flow patterns are analysed graphically and discussed with respect to a weakly nonlinear analysis and to experiments. In a particular case, A=4 and Pr=0.02, an oscillatory motion has been obtained and some features of the flow pattern are shown during a period.


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    Titel :

    Steady and oscillatory convection in vertical cylinders heated from below. Numerical simulation of asymmetric flow regimes


    Beteiligte:
    Crespo del Arco, E. (Autor:in) / Bountoux, P. (Autor:in) / Sani, R.L. (Autor:in) / Hardin, G. (Autor:in) / Extrémet, G.P. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 8 , 12 ; 281-292


    Erscheinungsdatum :

    01.01.1989


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch