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Why doesn't my two-step chemical model work?[For H2+air reaction][finite rate model]

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Old   November 9, 2019, 14:28
Question Why doesn't my two-step chemical model work?[For H2+air reaction][finite rate model]
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I'm trying to use the two-step chemical model in my simulation. Here is the chemical mechanism:

Here is the reference of the mechanism:

I wrote this CHEMKIN file:

O  H  N                                                                           
OH  H2  O2  H2O  N2                     

H2+O2<=>2OH                     2.3E+22    0.000  10202           
2OH+H2<=>2H2O                    1.83E+27    0.000  21992 

I imported the CHEMKIN file and it's ok but the solution and the residuals doesn't look ok. See:

As you see the residuals of OH and H2O have oscilation. It should be noted that the solution is ok for one-step Hydrogen-air mechanism of Fluent.

What's the matter with this mechanism? What's your opinion? How to solve it?
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