[En_aliali]

Hello,
I'm new member in this website
Please if there is some one could help me in next problem description:
I have pure natural convection problem open domain such as vertical channel and there are heaters inside this channel, my question is how to set the boundary conditions at the entrance (pressure inlet) and outlet (pressure outlet) of that case? and the entrance is at the lower part of channel and the outlet is at the top of the channel.
I use Ansys fluent.