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Old   July 21, 2011, 14:15
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Gunawan Aneva
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Hi everyone..
Pliss help me..

I want to do simulation with dieselEngineFoam. I want to add CH4 in time ( or in initial condition) directory. Probably, what should I do? What files should I change?

If someone can help me, it would be great.

Thanks
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Old   July 21, 2011, 17:56
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Marco A. Turcios
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You will need to specify initial and boundary conditions for CH4 in the 0 directory (copy Ydefault to CH4 and modify it). Then you will need to ensure that your reaction mechanism included methane as a species (this will be in the chemkin directory; read the tutorials for reactingFoam to find out about reactions):

http://openfoamwiki.net/index.php/Tu..._firstTutorial
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Old   July 22, 2011, 13:14
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hi Marco.

Thanks for your answer. But I am still confused. I want to use two fuels. The first is c7h16 and second CH4. I want to put the CH4 in the combustion chamber as O2, N2 and others. I want to put in 0 directory. so it is not injected. What should I do? how to ensure that the correct reaction?.

Thanks
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Old   July 22, 2011, 13:19
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Marco A. Turcios
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To ensure the correct reaction, you need to add the reactions and species to the chem.inp and therm.dat files. There is a lot of documentation on the proper format for these files, and you will need to determine what kind of reaction mechanism you are going to use.
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Old   July 22, 2011, 14:30
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Hi marco.

I have changed the file chem.inp and thermo.dat. how do you think about this:

ELEMENTS
H O C N AR
END
SPECIES
C7H16 O2 N2 CO H2O
O CO2 OH H H2
HO2 H2O2 N NO C
CH4
END
REACTIONS
C7H16 + 11O2 => 7CO2 + 8H2O 1.00E+8 0.0 15780.0! 1
FORD / C7H16 0.25 /
FORD / O2 1.5 /
CH4 + 2O2 => CO2 + 2H2O 1.50E+13 0.0 39718.0! 1
FORD / CH4 0.5 /
FORD / O2 1 /
(file in chem.inp)
is this correct?

do I also need to change the thermophysicalProperties file?.
then, what do you mean with:
"you will need to determine what kind of reaction mechanism you are going to use."

sorry, I am still confused
Thanks you for your patience
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Old   July 22, 2011, 14:48
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Marco A. Turcios
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You've already decided which reaction mechanism you are using: single step. There are more complex ways that describe the reaction of methane with air that has intermediate reactions. You will need to make sure that the therm.dat has entries for the species that you have added (in this case, CH4).

This should be enough to get you started. Whether this is enough to get a correct solution is another matter that will take more effort to answer...
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Old   July 22, 2011, 21:41
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hi marco

I have added CH4 in the therm.dat. thanks for your answer. I will try to simulate it first.
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