failure of ignition when using chemkin imported thermodynamic and transport data
 

hello all,

I am simulation methane air catalytic combustion in a micro-channel. The gas phase reactions are ignored and surface mechanism and thermo are imported by chemkin files.

First, I tried to use default value of gas thermo and transport in fluent data base. I can get ignited results though with some discontinuities and discrepancies with literature. In order to improve the results, I tried to import gas thermo and transport data attached with GRI3.0 mechanism. However, this time I can not get ignited results. The reaction zone just moves very slowly from the inlet to outlet and finally all the computation domain is room temperature.

The link below shows a thread I posted on ansys student community.
https://studentcommunity.ansys.com/t...d-air-mixture/

I am really confused about why the failure of ignition associated with chemkin imported gas thermo and transport data.

Can anybody give me some hints?

thanks

weiqiang.

by the way, the energy residual is very small like 1e-4 at the beginning of iteration. Does it mean all the reactions do not happen?