[NewKid]

Hi, everyone,
A warning message "JanafThermo<EquationOfState> out of temperature range 216.37-400, T=xxx" appears repeatedly, where xxx means a temperature over 400K while calculating a supersonic flow case.
Though it dose not stop the calculation and set the highest temperature 400K, how to get rid of this message?

Thanks in advance!

[olivierG]

hello,
take a look in your constant/thermophysicalProprties file.
In the thermodynamics part, you have to set Tlow and Thigh.
If your janaf polynome is still valid to 800 + K (still positive !), just set Thight higer ...
regards,
olivier

[NewKid]

Hi, olivierG,
In constant/thermophysicalProperties, there are no items named Tlow or Thigh, after I search the tutorials, find in a case named bubbleColumnEvaporating there exists those items as follows in constant/thermophysicalProperties.gas:
H2O
{
specie
{
nMoles 1;
molWeight 18.0153;
}
thermodynamics
{
Tlow 200;
Thigh 3500;
Tcommon 1000;
highCpCoeffs (3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677);
lowCpCoeffs (4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032)
}
transport
{
As 1.67212e-06;
Ts 170.672
}
}
There is another one for air.
Seems I have to specify highCpCoeffs and lowCpCoeffs while Thigh and Tlow, how to specify those coeffs? What does Tcommon mean?
Now I add gas item as follows:
gas
{
O2
{
thermodynamics
{
Tlow 200;
Thigh 800;
Tcommon 500;
highCpCoeffs ( 3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677 );
lowCpCoeffs ( 4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032 );
}
}
N2
{
thermodynamics
{
Tlow 200;
Thigh 800;
Tcommon 500;
highCpCoeffs ( 3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677 );
lowCpCoeffs ( 4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032 );
}
}
}
I just copy all the coeffs from the case in OF tutorials and have started the parallel computation to test the modification of thrmophysicalProperties.

Any clue to the coeffs?

[NewKid]

Seems it does not work, the warning message still occurs.
O2
{
thermodynamics
{
Tlow 200;
Thigh 800;
Tcommon 500;
highCpCoeffs ( 3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677 );
lowCpCoeffs ( 4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032 );
}
}
N2
{
thermodynamics
{
Tlow 200;
Thigh 800;
Tcommon 500;
highCpCoeffs ( 3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677 );
lowCpCoeffs ( 4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032 );
}
}
Still the same result.

Any clue?