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-   -   Species Transport and other combustion models in fluent (http://www.cfd-online.com/Forums/fluent/99702-species-transport-other-combustion-models-fluent.html)

dsn2491 April 10, 2012 02:31

Species Transport and other combustion models in fluent
 
I would like to know when the species transport model should be used and when the pre-mixed or non pre-mixed combustion models should be used.?

I have read the manual but it just confuses me more.

My doubt is can we simulate combustion by using just the species transport model with reactions enable?

And when do we have to use the other combustion models.

Reply will be greatly appreaciated..Please urgent help needed

tsram90 April 10, 2012 09:22

Quote:

Originally Posted by dsn2491 (Post 353887)
I would like to know when the species transport model should be used and when the pre-mixed or non pre-mixed combustion models should be used.?

I have read the manual but it just confuses me more.

My doubt is can we simulate combustion by using just the species transport model with reactions enable?

And when do we have to use the other combustion models.


I too am not quite sure of this. But from what I get, species transport, is used when very simple reactions are used. There are no predefined reactions and no ratios or anything. Its more like a simpler, general case.


Premixed combustion is used when there fuel-air mixture is flowing into the area of combustion. The mixture fractions will be fully uniform all over.( which means you can't use injections etc.

Non-premixed is just the opposite of premixed model. You and give any mode of air fuel mixture. ( it can be premixed or non-premixed).

The premixed combustion is derived from non-premixed combustion. So using non-premixed, you can model premixed but not vice versa.

dsn2491 April 10, 2012 13:30

it would also be of great help if you can tell me which class of combustion does shock initiated combustion come under?

can it be modelled using species transport or does pre-mixed or non-premixed modelling need to be used?

tsram90 April 10, 2012 14:22

Quote:

Originally Posted by dsn2491 (Post 354027)
it would also be of great help if you can tell me which class of combustion does shock initiated combustion come under?

can it be modelled using species transport or does pre-mixed or non-premixed modelling need to be used?


I think you can go with premixed combustion.

dsn2491 April 10, 2012 14:52

Thank you so much once again. I will follow ur advice and willlpost about the results soon.:)


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