Cabin humidity calculations Fluent
 

Hello,

I am trying to predict the humidity on the windshield of the vehicle cabin. I am using species transport model for the humid air. Inlet air at the floor is coming at 31 deg celsius and mass fraction for it .0061 (80%RH based on outside air temperature of 10 deg). The two cabin occupants are adding 40g/hr of water vapor (i.e 1.2e-5 kg/sec and mass fraction of 1 for H20 species). When i run steady state simulations I am getting the RH on windshield above 1000%!!!!

Can anyone tell me what I am doing wrong?

Solution
 

Ok,

I made a mistake. Two cabin occupants dont add only water vapor. They add saturated air into the cabin with 100% RH (.03444 mass fraction for h20). Results are obtained transient case and results are fine.