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my question is: can I use a RANS simulation to see the effect of mixed/natural convection?

Actually I have also a second question: I would like to do this in Comsol multiphysics, but it seems that it has no model that takes into account turbulence (like k epsilon, Reinolds stress, LES, ecc..). Ps: this could be because I use a pretty old version of the software, but anyway I haven't found documentation about this topic so far.

Thank you for your answers!

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  • $\begingroup$ What are your Rayleigh and Reynolds numbers? $\endgroup$
    – Bill Barth
    Commented Mar 16, 2013 at 2:29
  • $\begingroup$ I haven't set the case yet, but would be such as $\frac{Gr}{Re^2} $ would be near 1, to guarantee mixed convection. $\endgroup$
    – Lorenzo Nespoli
    Commented Mar 16, 2013 at 7:50
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    $\begingroup$ I think that you've got to know whether the flow is likely to be turbulent before you can know if RANS is applicable. $\endgroup$
    – Bill Barth
    Commented Mar 22, 2013 at 3:56

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