how to divide domain?

manish

hi all

My domain is axisymmetric .i want to divide it 2 sub domain.In one sub domain hydrogen gas is flowing and in second domain flue gases are flowing. They are not mixing. They are separated by plate. how to divide domain? initially i want to specify properties of flue gases ( density, specific heat) instead using combustion model. where should i specify these properties?

Earlier i had selected domain material as hydrogen and i had created inlet for flue gases and specified density and temperature. but in post procesing it is showing density(DEN1) of hydrogen throughout the domain.can anybody help me out?

Thanks in advance

manish kadam