CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Species in Mixture (http://www.cfd-online.com/Forums/fluent/107916-species-mixture.html)

alavar October 9, 2012 11:31

Species in Mixture
 
Hi All,

I define a gas mixture consisting of, let say, three species 'a','b', and 'c'. When I want t assign boundary conditions, under species-tab, by default, I am given options to set mass fration of only 'a' and 'b'. But I want to be able to assign the mass fraction for the other element ('c'). What am I missing?

Thanks,
A

coglione October 10, 2012 03:10

Keep in mind that all mass fractions must sum up to 1.
After some sophisticated mathematics the equation a+b+c=1 will give you the right answer.

cheers

idil January 18, 2013 08:28

the last specie in the mixture list you assign should be the bulk specie. you cannot specify the mass fraction of the last one it computes automatically.


All times are GMT -4. The time now is 05:27.