Natural convection modelling on a 3D rectangular box

[kennethchaw]

Hi all,

I am trying to see the temperature distribution in a 3D rectangular box filled with air due to natural convection. The six walls boundary conditions (temperature value) will be defined. I did it using Boussinesq Approximation . However, I wonder if the velocity is normal?
Anyone can help if the result is logic?

I am using code saturne 4.0.5 on windows.

Thank you!!