Using SetFields to determine boundary conditions
 

Hi there,

I'm trying to simulate a pool of gas on a floor (to simulate a spill) dissipating into the surrounding air. For this simulation I am using reactingFoam, with the reactions turned off to simulate the mixing of the two species.
Since I don't want a continuous flow of gas, I set it up using a SetFields dict, to make a small pool of the gas on the bottom of the domain.

So my question is, how do I set the boundary conditions for the gas in the 0 file? I know I need to have a specific file for each species including air and the gas, but how do I specify the initial field values for the gas, so its linked to the setFieldsDict file?