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-   -   Unrealistic temperature solution from OpenFoam (https://www.cfd-online.com/Forums/openfoam-solving/183914-unrealistic-temperature-solution-openfoam.html)

UHGAR February 16, 2017 12:40

Unrealistic temperature solution from OpenFoam
 
Hello All,

I am running a high pressure backward facing step combustion simulation.

My BCs are,

Pressure:
Internal feild = 200e5;
Inlet = Zero pressure gradient;
Outlet = 200e5;

Temperature:
Internal feild = 1000;
Inlet = Zero pressure gradient;
Outlet = 1000;

Velocity :
Internal feild = 3 m/s;
Inlet = 3.33;
Outlet = Zero pressure gradient;

Error I am getting:

Code:

--> FOAM Warning :
    From function janafThermo<EquationOfState>::limit(const scalar T) const
    in file /home/lab/OpenFOAM/OpenFOAM-2.1.RG/src/thermophysicalModels/specie/lnInclude/janafThermoI.H at line 108
    attempt to use janafThermo<EquationOfState> out of temperature range 200 -> 5000;  T = 135.019

Can someone let me know, what are the possible reasons and how to fix this?

Thanks,
UHGAR

anishtain4 February 16, 2017 12:58

What is the size of your domain? Also what temperature boundary conditions are you using for the walls? Are they insulated? It would be helpful if you can post a side shot of velocity and temperature contours.


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