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Ignition with PaSR

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Old   May 30, 2017, 06:48
Default Non premixed Ignition with PaSR
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SM
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Trying to run counterFlowFlame2D with PaSR combustion model instead of laminar using Ofdev version.

Firstly, I have run the tutorial with laminar model and copied the final solution to 0. Then I change the combustionProperties to following

Code:
combustionModel  PaSR<psiChemistryCombustion>;
active  true;
PaSRCoeffs
{
    Cmix                1.0;
    turbulentReaction   banana;//doesn't matter?
    useReactionRate     banana;//doesn't matter?
}
However, the temperature keeps on dropping till it reaches 293K,
the inlet fuel and air temperature.
So it looks that the ignition did not occur.

Can anyone comment what is going wrong here?
The case files are attached.
Attached Files
File Type: zip PaSRcounterFlowFlame2D.zip (161.2 KB, 23 views)

Last edited by canopus; May 30, 2017 at 12:05.
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Old   June 5, 2017, 06:34
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Lasse Brams Vinther
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Hello SM,
I believe the issue is the adaption from laminar to PaSR, as PaSR is a turbulent combustion model determining a finite combustion rate based upon the turbulent and chemistry time scales.

I have attached a not thoroughly tested case, based upon the counterflowflame2d case from OF4.1, with the added turbulent property changes.

Note that the turbulent properties are just guess values.
Attached Files
File Type: gz counterFlowFlame2D.tar.gz (3.7 KB, 75 views)
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combustion, ignition, pasr


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