|February 22, 2010, 16:17||
janafThermo: How to read formula? or at least: How to use hPolynomialThermo?
Join Date: Jan 2010
Posts: 15Rep Power: 8
I'm simulating a nozzle with OpenFOAM. When using a constThermo-modell the simulation ends with "maximum number of iterations exeeded"-exeption for the thermodynamic model so I was thinking of using some variable heat-capacity-setting like janaf or polynoms.
But how do I have to understand the formula for the janaf-model that is given in the user-guide (http://www.openfoam.com/docs/user/th...37-2040007.1.1)?
In the biconic25-55Run35 tutorial from rhoChentralFoam there is a thermodynamic model using janaf-coefficients for N2. Unfortunately if I put those coeffs into the in user-guide provided formula for calculating heat-capacity from janaf-coeffs the function does not even behave like the experimental data (e.g. http://www.engineeringtoolbox.com/nitrogen-d_977.html)... Instead of rising with temperature the heat-capacity is lowering? The search-function didn't lead to any results...
Am I missing something? Are the coeffs in the tutorial wrong? Am I taking the wrong formula?
And by the way: How can I use the polynomial-model? In the user-guide there is only a link to a tutorial. I cannot find a word about hPolynomialThermo there (even if it obviously uses some polynoms... for heat-capacity as well as for some other vars...)
Thanks in anticipation for any suggestions or explanations!
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