# A question about species box of species transport model

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 June 22, 2014, 22:27 A question about species box of species transport model #1 New Member   Yibao Shang Join Date: Jun 2014 Location: China Posts: 7 Rep Power: 4 Hey guys! According to descriptions made by Fluent User's Guide, the last species in the species dialogue box is the "bulk species" and we should make sure the last species is the most abundant among all species. But as far as I'm studied, the last species in will not appear in the Initial Values menu thus being unable to be give a value. Consider the combustion in the air, the most abundant species is N2, how will I operate to give it a certain value while it's the last species in the box?

June 23, 2014, 11:15
#2
Member

şakir
Join Date: Mar 2012
Posts: 30
Rep Power: 6
Quote:
 Originally Posted by tjushang Hey guys! According to descriptions made by Fluent User's Guide, the last species in the species dialogue box is the "bulk species" and we should make sure the last species is the most abundant among all species. But as far as I'm studied, the last species in will not appear in the Initial Values menu thus being unable to be give a value. Consider the combustion in the air, the most abundant species is N2, how will I operate to give it a certain value while it's the last species in the box?
you can give all other species mol or mass fraction then remaning mole or mass fraction will be N2 get automatically.

June 25, 2014, 07:56
#3
New Member

Yibao Shang
Join Date: Jun 2014
Location: China
Posts: 7
Rep Power: 4
Quote:
 Originally Posted by silverra1n you can give all other species mol or mass fraction then remaning mole or mass fraction will be N2 get automatically.
Thank you for your reply. But the numbers input to initial value lists are the total mass of the species, which will be translated into mole fraction according to their mole mass. How should I operate to initialize the mole fractions or mass fractions of all the species at the very beginning?

 Tags fluent, mole fraction, species transport

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