Boussinesq model gives constant density
Hello,
I'm using the Boussinesq model for density for a natural convection problem with water. I've set the operating temperature and thermal expansion coefficient for water. The temperature difference is a maximum of 25K but still the density contours are constant throughout the entire domain. However I do get a velocity field and the only driving force I have is buoyancy so there must be some density difference. Why can't I see it in reports or contours? Regards Ola 
Re: Boussinesq model gives constant density
The BoussinesqApproximation is applyed just to the buoyancyexpression in the navierstokesequations and not to the general density, which is treated as constant.
I experienced the same problem with a natural convection problem. The density was constant all over the area. But I got the right solution for the velocityfield. Therefore I suppose there is an other problem with your simulation. 
Re: Boussinesq model gives constant density
If you did not use a boundary layer in the vicinity of a wall, you may not observe those density gradients. Try meshing with a boundary layer in gambit

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