Hi Wimukthi, Please find below the response to your queries.
1). You dont have to convert the units. Fluent does it for you. The unit of Pre-exponential factor depends on the order of reaction + the unit of K appears in pre-exponetial factor only if Temp exponent is present.
2) You can refer the CHEMKIN Input Manual to verify the syntax used. At a first glance, I dont see any issue with your mechanism code.
3) When you enable reaction modelling using species transport (a mixture template gets created) with the species in the imported mechanism. You can initailize your 2D domain with the mass fraction of H2 and air as per your choise. You can patch a high temperature within your domain to initiate combustion.
Regards,
Vijay
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