View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0000453 | OpenFOAM | Bug | public | 2012-03-08 14:33 | 2012-04-02 17:38 |
Reporter | Assigned To | ||||
Priority | high | Severity | major | Reproducibility | always |
Status | closed | Resolution | fixed | ||
Platform | Linux | OS | Ubuntu | OS Version | 10.04 |
Summary | 0000453: reactingFoam - to high temperature and wrong gas mixture depending on kinetics | ||||
Description | As it is reproduced in the attached case the temperature of a premixed methane-air flame reaches nearly 5000 K. The real adiabatic temperature should be about 2200 K. CO2 and H2O are calculated to high (about 40 and 25 m-%) and N2 to low. A stoichiometric combustion of methane should produce about 15% CO2, 12% H2O and 73% N2. This effect depends on the arrhenius reaction coefficients. If you choose a lower value of A=5.2e14 instead of A=5.2e16 (in /constant/reactions) the calculated output is correct. | ||||
Steps To Reproduce | I'll attach a case | ||||
Tags | No tags attached. | ||||
2012-03-08 14:33
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I agree regarding the adiabatic temperature and the ratio of the product of combustions. I don't think the problem lies on the factor of the Arrhenius reaction (A) but in the combustion model parameters for your case. Your mesh resolution is (8.3e0-3 m) which is larger than the reaction zone (~1 mm). Thus, In our tutorial for reactingFoam the temperature is about right 2200 K, but we use a grid resolution of 2e-4 m. You'd need to adjust Cmix to account for the proper mixing/burning of your combustion. Probably reading some bibliography for a PaSR modelling would help. Regards |
Date Modified | Username | Field | Change |
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2012-03-08 14:33 |
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New Issue | |
2012-03-08 14:33 |
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File Added: ReactingFoam.tar.gz | |
2012-03-13 15:39 |
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Note Added: 0001136 | |
2012-03-13 15:39 |
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Assigned To | => user21 |
2012-03-13 15:39 |
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Status | new => assigned |
2012-04-02 17:38 |
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Status | assigned => closed |
2012-04-02 17:38 |
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Resolution | open => fixed |