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Homework Help: Adding buoyancy to 3D integration of diffusion equation

  1. Jan 17, 2006 #1
    I have managed to create a simple CFD model to integrate in 3D the heat/diffusion equation, namely dT/dt = k d2T/dx2.

    This works fine, but I would now like to add the effect of 'less dense rising' assuming the gas is operating in air -- I think I'm right in saying that's called buoyancy (I'm not a physicist).

    SO my question is, can someone post a (hopefully) simple extension to this nice little equation that includes the buoyancy effect. I would assume it involves divT dot g, (where g is a vector of gravity), but thats as far as I can fathom.

    Any help much appreciated,
  2. jcsd
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