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COMSOL Natural Convection Thermosyphon Convergence Problem

  1. Jul 15, 2010 #1
    Hello,
    Im having some problems with COMSOL multiphysics 3.5a. I am using 2D weakly compressible flow with general heat transfer and am trying to model a natural convection loop.

    The Approach I have taken is to use properties of the material for a certain range of temperatures to model the variations in density with temperature which are responsible for the natural convection loop.

    I have got the model working only for very small temperature difference (1degK) but above this temperature difference the model goes haywire. I was wondering if anyone has any insights into this problem.
     
  2. jcsd
  3. Jul 19, 2011 #2
    Are you sure you should be using 2D weakly compressible flow? I feel like you should be using something else. Did anyone figure this out!? THANKS
     
    Last edited by a moderator: May 5, 2017
  4. Jul 21, 2011 #3
    Yeah i had the same problem/ I think the material temperature is off with the variations in density.
     
    Last edited by a moderator: May 5, 2017
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