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-   -   Physical properties about "Air Ideal Gas" In CFX (http://www.cfd-online.com/Forums/cfx/20481-physical-properties-about-air-ideal-gas-cfx.html)

Twiti July 8, 2004 21:42

Physical properties about "Air Ideal Gas" In CFX
 
I am doing numerical simulation about the mixing of two fluids with different temperature by CFX-5. Both of the fluids were set to "Air Ideal Gas" with the higher temperature of 300k and the lower temperature of 150 (pressure 1 atm). But I got the averaged density at the high temperature(300K) inlet the value of 2.34kg/m^3, which should be 1.2kg/m^3 dut to the temperature and pressure. Can anybody tell me the possible reason? I am a new user of CFX.

deLuther July 9, 2004 00:28

Re: Physical properties about "Air Ideal Gas" In C
 
It seems to be like you have temperature close to 150K at inlet(density 2.3528228852054585 kg/m^3)... Check your physics. Or describe your model more precisely(or send it if it is small).

Twiti July 10, 2004 02:22

Re: Physical properties about "Air Ideal Gas" In C
 
Thanks, deLuther

This is my first time to use CFX (used to Fluent before), so maybe I have made some very stupid mistakes. The density at the low temperature 150K inlet is 4.33 refer to the area-averaged calculation, which is almost twice the ordinary value(similar thing happened at the 300K inlet). I just set desity to be calculated based on the ideal gas law.

I'll check it more carefully.


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