Unrealistic temperature solution from OpenFoam

UHGAR · February 16, 2017, 12:40

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.

February 16, 2017, 12:40	Unrealistic temperature solution from OpenFoam	#1
UHGAR New Member UHGAR Join Date: Sep 2016 Posts: 12 Rep Power: 9	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

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February 16, 2017, 12:58		#2
anishtain4 Senior Member Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 273 Rep Power: 18	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.