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-   -   Increase in reactant concentration (http://www.cfd-online.com/Forums/fluent/107078-increase-reactant-concentration.html)

Jenny_W September 17, 2012 07:09

Increase in reactant concentration
 
Hi Everyone,
I am simulating a reaction in FLUENT. There are 2 reactants and 2 products.
I wrote my own reaction mechanism and it seemed right.
However, when I checked the results, the concentration of one of my reactants increased towards the exit of my computational domain.
This is very confusing because I think that the amount of reactants should reduce as they are converted to the products.
If anyone has faced this problem before or knows what may have gone wrong, please kindly let me know.
Thank you,
Jenny

eng_s_sadeghi September 17, 2012 07:52

That may be the reverse flow at outlet. You have not set outlet fuel mass fraction as zero and when it reverses, cames back to domain.

snh September 18, 2012 02:36

Doubt..
 
Quote:

Originally Posted by eng_s_sadeghi (Post 382120)
That may be the reverse flow at outlet. You have not set outlet fuel mass fraction as zero and when it reverses, cames back to domain.

Hi,
how to set the outlet fuel mass fraction to zero ?

eng_s_sadeghi September 18, 2012 03:17

Quote:

Originally Posted by snh (Post 382260)
Hi,
how to set the outlet fuel mass fraction to zero ?

Outlet should be as "pressure outlet" to could set the species parameters.

Jenny_Wong September 18, 2012 10:59

Thank you very much eng_s_sadeghi, I will try it.
Jenny


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