natural convection simulation in openfoam
 

hi to all

i am simulation natural convection from a fuel pin using openfoam-1.5. can some one help me which solver i should use which count for density as a function of temperature.

in this case a constant heat flux at the surface of fuel pin is taken where as water as used as a coolant for heat removal.

i am a new user in cfd and i dont know weather my question make a sense or not but hope i will get help,
thanks