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-   -   couple chemical kinetics (https://www.cfd-online.com/Forums/avl-fire/119394-couple-chemical-kinetics.html)

 amin_u50 June 16, 2013 16:40

couple chemical kinetics

hi kimmhw...
The problem of recognizing the species is solved but during calculation i face to follow message and finish the calculation in the first iteration...

%fire-I-chom_rate, calling solver for homogeneous reactions
%fire-I-chom_rate, progress of ODE solution = 20%
%fire-I-chom_rate, progress of ODE solution = 40%
%fire-I-chom_rate, progress of ODE solution = 60%
%fire-I-chom_rate, progress of ODE solution = 80%
%fire-I-chom_rate, progress of ODE solution = 100%

* 1. Time Step Time = 0.5555555556E-04 dt = 0.5556E-04 *
* Angle = 540.500 dphi = 0.5000E+00 *

ITER I***************** Relative Residual Source Sums *************I I******** Field Values at Monitoring Location 1 *******I

NO. RESU RESV RESW RESM RESK RESD RESH U V W P TKIN DISP TEMP

thanx for help
best regards
amin_u50

 kimmhw June 19, 2013 21:29

Hi,

There is no error message.
The calculation crashed just after 1st iteration?

 amin_u50 June 20, 2013 01:58

hi kimmhw...
yes...after 1st iteration the calculation stopped.
M.r kimmhw...I think that in the initial values @(initial values of species) should inters the species values but i don't know what is this value? i think stop calculation due to this...please help me...
thanx...
best regards
amin

 kimmhw June 20, 2013 02:51

Hi amin,
initial values mean initial values of each species.. simple.
But it shouldn't be a problem.
In case that an user set "0" for all of species, FIRE sets the fraction of last species as "1".
The sum of all of species fraction should be 1.

I think your problem comes from emission module.
When you want to use "general gas phase reaction" + emission, there is a limitation to select the emission model.

Just try to calculate again after deactivation of emission module.
If it is correct, please check the selected emission models in your ssf.

The following emission models can be used for general species transport only :
NO:
-Heywood original
-Heywood + temperature fluctuation

Soot:
-Kinetic Model
-Kennedy/Hiroyasu/Magnussen
-Hiroyasu/Nagl/Strickland-Constable

 amin_u50 June 20, 2013 12:39

hi kimmhw...
my problem is solved with your help and thank you very much...i wish all the best for you...
best regards..
amin_u50

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