Indoor humidity analysis using Star ccm

Sandy7 · January 23, 2017, 14:20

Star CCM+ user!

My goal is to find out the mass fraction of water vapor in indoor air; to achieve this I am using Multi-component gas model.. (Gas components includes H2O and Air).

I have defined the following properties.

continua/physics1/Initial conditions/species mass fraction [0.012, 0.988]

For each vent:

Regions/vent1/species mass fraction [0.012, 0.988]
similar to the other two vents.

After convergence its giving some results on plane but the mass fraction value is almost same every where in the house. (screenshot attached).. These results are skeptical to me.. did anyone has this issue as well?

Can someone explain how to use field functions?.. for entering the mass fraction of H2O.

Any hint, any suggestions..

Thanks!
Sandy

me3840 · January 23, 2017, 14:51

There are lots of field function examples and guides in the user guide under Using Tools>Field Functions

If you have a constant flow of mass in the domain with a constant humidity isn't it expected that the fraction of water everywhere is the same? Why would we expect it to change?

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January 23, 2017, 14:51		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	There are lots of field function examples and guides in the user guide under Using Tools>Field Functions If you have a constant flow of mass in the domain with a constant humidity isn't it expected that the fraction of water everywhere is the same? Why would we expect it to change?