How to define humidity in CFX

ghorrocks · March 12, 2023, 17:51

If you post an image of what you are modelling and your CCL or output file we can try to help you.

arunvijay · October 17, 2023, 03:21

Quote:

Originally Posted by atulpat

Thanks Sosat...
Except Temperature results now everything is OK (i.e. Relative humidity). Your expression is working in CFX P

st. I have used following expression for RH.
Insert→ Expression→ Pg
Definition = exp((20.386-(5132 [K]/T)))*132.29 [Pa]

Insert→ Expression→ Relative Humidity
Definition = (Water Vapour at 25 C.Mass Fraction/18.016)*(((Water Vapour at 25 C.Mass Fraction*18.016)+((1-Water Vapour at 25 C.Mass Fraction)*29))/Pg)*Absolute Pressure*100

Insert→ Variable→ RH and in expression set Relative Humidity

Now, if any anybody knows reason of temperature plot problem then please help me. Here Radiation model is not activated and sometimes I am thinking that due to this only I am getting slightly higher temperature.

Hi, from where you got the 20.386, 5132 and 132.29 values for equation of Pg. Could you please share ?

March 12, 2023, 17:51		#21
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	If you post an image of what you are modelling and your CCL or output file we can try to help you. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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