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-   -   Error in the enthalpy equation (http://www.cfd-online.com/Forums/openfoam-pre-processing/62138-error-enthalpy-equation.html)

danilo April 19, 2007 16:33

Hello everybody, I am using
 
Hello everybody,

I am using the reactingFoam solver for a very simple case: the geometry is 2D axisymmetric geometry, the fuel is methane in a coflow of air and the chemistry is simply a 1 step reaction. Unfortunately I have some problems in the enthalpy equation. During the calculations in some cells the temperature reaches a value higher than 5000K which is the maximum value available for the estimation of transport properties in the gaseous mixture; then the following error message appears:

---------------------------------------------------

-> FOAM FATAL ERROR : attempt to use janafThermo<equationofstate> out of temperature range 200 -> 5000; T = 5081.35#0 Foam::error::printStack(Foam:http://www.cfd-online.com/OpenFOAM_D...part/proud.gifstream&)
#1 Foam::error::abort()
#2 Foam::specieThermo<foam::janafthermo<foam::perfect gas> >::H(double) const
#3 Foam::hMixtureThermo<foam::reactingmixture>::calcu late()
#4 Foam::hMixtureThermo<foam::reactingmixture>::corre ct()
#5 main
#6 __libc_start_main
#7 __gxx_personality_v0


From function janafThermo<equationofstate>::checkT(const scalar T) const
in file /home/dm2/henry/OpenFOAM/OpenFOAM-1.4/src/thermophysicalModels/specie/lnInclude/ janafThermoI.H at line 73.

FOAM aborting

Aborted

-------------------------------------------------

I tried different initial conditions and different meshes and I also changed the chemistry of my case but the problem remains.

I saw that many people experienced the same problem but nobody explained the reason and proposed a solution. I am wondering if it is possible to force a maximum value in the temperature field (for example 3500K); this is the solution I usually use in FLUENT, but I don't know how to implement it in OpenFoam

Do you have any suggestions? Is there anybody who fixed this problem?

Thank you,
Danilo


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