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Forum: STAR-CD

October 23, 2009, 12:00

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

Hi Pauli, i tried to set passive scalars values...

Hi Pauli,
i tried to set passive scalars values to 1, but the solution diverges.. Can you explain the meaning of variables MIX_FRAC-FUEL? If the leading reactant (CH4) mass fraction of reaction 1 is...

Forum: STAR-CD

October 23, 2009, 07:03

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

Do i also define CO2 as a reagent? (when i...

Do i also define CO2 as a reagent?
(when i define the three reactions, i put CO2[R] because if a product is transported into the solution domain from an external source, it also should be specified...

Forum: STAR-CD

October 23, 2009, 04:01

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

Hi Pauli! The O2 is coming from a separate...

Hi Pauli!
The O2 is coming from a separate inlet.
So the passive scalars represeant the mass fractions of leading reactants for each reaction equation in relation to oxidant mass fraction.. So if...

Forum: STAR-CD

October 22, 2009, 04:47

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

Hello Pauli, thanks so much for your help. ...

Hello Pauli,
thanks so much for your help.
Yes, all my scalars are active with temperatures dependent properties.
But i think i have found the problem in defining boundary conditions - scalar...

Forum: STAR-CD

October 21, 2009, 12:05

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

Thanks Pauli, i already tried to define inlet...

Thanks Pauli,
i already tried to define inlet fuel boundary as you have suggested..
The simulation startes without problems but results are bad:

the mass fractions in the inlet fuel tube...

Forum: STAR-CD

October 21, 2009, 07:17

Replies: 8

STARCD - inlet boundaries definition in combustion problem

Views: 2,480

Posted By Paolo

STARCD - inlet boundaries definition in combustion problem

Hi!
I have a problem in defining a fuel consisting of a mixture of gases (CH4,CO,N2,CO2,H2), which enter in the combustion chamber each characterized by its own mass fraction.
The fuel enters from...

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