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Adjacent airspace with different initial concentration possible?

Question asked by Dan Hofstetter on Jun 4, 2012
Latest reply on Jun 5, 2012 by Dan Hofstetter



I got my solid floor modeling to work, and am moving on to a slotted floor scenario:


There is a slotted floor that separates a pit (below) from a barn (above).  The airspace in the pit has an initial concentration of H2S = 156.9 ppm (the rest is air), and the airspace in the barn is 1,000,000 ppm air.  I tried setting up the model (attached) with a fluid subdomain for the pit, but Solidworks doesn't like the situation where there is no solid divider above.  Does anyone know how I can get this to work?  I'm trying to get the simulation to run with natural recirculation.  The velocity vectors seem to do this, but the gas evacuation/mixing is too fast if the initial concentrations are wrong.