[jjperez]

I am trying to simulate an industrial building in which there are some emissions sources inside. In order to avoid fugitive emissions outside the building, it has been considered to keep the pressure inside the building below the environmental pressure, being the air volumetric flowrate at the outlet higher than the air volumetric flowrate at the inlet (there is an impulsion of air inside the building and a extraction). I am having some troubles trying to simulate this so, any suggestion about the boundary conditions and the models to be used would be welcome.