Talk:Tut reactingFoam firstTutorial

1 adaption to OpenFOAM-1.6

It is possible to use the tutorial in OpenFOAM-1.6 with some minor changes:

a "g"-file is needed in the /constant directory, which can be used from the new aachenBomb-tutorial
file "constant/chemistryProperties"
- chemistrySolver should be ode instead of ODE
- there should be a odeCoeffs-dictionary instead of ODECoeffs
- added the line psyChemistryModel ODEChemistryModel<gasThermoPhysics>; after the header
file "constant/thermophysicalProperties"
- replace line thermoType hMixtureThermo<reactingMixture>; by thermoType hPsiMixtureThermo<reactingMixture<gasThermoPhysics>>;
- check for correct places of CHEMKINFile and CHEMKINThermoFile, it works with CHEMKINFile "../chemkin/chem.inp"; and CHEMKINThermoFile "../chemkin/therm.dat";
file "0/T"
- in boundary condition "outlet", replace type fixedValue; value uniform 800; with type zeroGradient;
a "constant/RASProperties"-file could be needed, examples can be found e.g. in the new aachenBomb-tutorial

--Aortwein 14:01, 12 May 2010 (UTC)

Now: adaptation to OpenFOAM-1.7.1 --Aortwein 13:23, 14 December 2010 (CET)

Thanks for the tutorial, however, I am getting the following error in the third time step, and have not been able to find the problem:

--> FOAM FATAL ERROR : attempt to use janafThermo<equationOfState> out of temperature range 200 -> 5000; T = 5000.92#0

Any suggestions or a fix would be very appreciated. Thanks again. ~E

a possibility could be to change the oxygen in the lowerInlet (in the the 0/O2 file) from 1.0 to (say) 0.9 or less and the nitrogen in the lowerInlet ( 0/N2) from 0.0 to 0.1 to cool down the reaction
note: my suggestion is not validated, since I did not have that problem yet, but the problem is also discussed here: at cfd-online.com --Aortwein 15:29, 4 December 2009 (UTC)
as far as I can see, the main problem lies in the "T" file in the "0"-Directory. Here, the boundary condition for "outlet" is set to "type fixedValue" with a value of 800. That should be changed to "type zeroGradient", afterwards it should work. If that change is not done, obviously that boundary condition is making problems as soon as a temperature higher than 800 K reaches the outlet. --Aortwein 10:31, 16 December 2009 (UTC)
One suggestion is to increase upper limit of the temperature in thermo.dat file. I have fixed this problem using this technique.

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