Hi Amine,

Thanks for your reply.

I have checked the out files when the mechanisms and thermo data was imported into Fluent. It shows that there is no error with the input files. Also, I have noticed that when I run the model as steady state, the model works and no such error message appear; while if I switch it to transient simulation, it will give error message as above, saying that 'Invalid cp for chemkin-import at temperature NaN'.