## COMSOL Natural Convection Thermosyphon Convergence Problem

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.
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 Quote by Conwedge Hello, Im having some problems with COMSOL multiphysics convergence engineer 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 mobility engineer model goes haywire. I was wondering if anyone has any insights into this mobile network security problem.
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

 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 convergence engineer loop. The Approach I have taken is to use properties of the material for a certain range of mobility engineer 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 mobility engineering temperature difference (1degK) but above this temperature difference the model goes haywire. I was wondering if anyone has any insights into this convergence engineering problem.
Yeah i had the same problem/ I think the material temperature is off with the variations in density.

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