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Old   May 14, 2011, 22:14
Default about reference pressure in CFX
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Hi,
I have a question about reference pressure. In definition of idea gas, there is a tab of "reference state", and "Air Ideal Gas" in CFX material library uses 14.7psi (1atm) as reference pressure. In domain setting, we also need to set a reference pressure. My question is,
Do I must set this reference pressure in domain setting as 14.7psi too (same as in Air Ideal Gas) if I use "Air Ideal Gas" as fluid? or they are just totally unrelated?

I usually set reference pressure in domain setting as "0 psi" for convenience because I am deal with absolute pressure (psia) all the time. I ask because I happened to read one sentence in CFX-help as below
"When using an ideal gas, it is important to set an appropriate reference pressure since some properties depend on the absolute pressure level."

Thanks for your answer
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