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how to use UDF for a passengers cabin section

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Old   March 29, 2015, 12:23
Exclamation how to use UDF for a passengers cabin section
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abo muhab
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simply
fluent code 14
passengers cabin section
win 7 - 32 bit
bound.cond 1- velocity inlet 1 ( 0.5 m/s mix air with co2 0.00085 mole fraction)
2- velocity inlet 2 ( passenger mouth co2 0.005 l / s for each person whom are 21 person ).
problem i face:
1- calculate the local mean age of air in cabin by a user defined scalar compiled as a UDF
2- what is the UDF i should write to calculate the LMAA and steps in fluent to set the fluid material .

thanks a lot for helping me.
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age of air, boundary condition, udf

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