methane combustion in micro-channel
 

Hi all,

I am doing a methane combustion simulation in micro channel. it's a two d planar model with very simple velocity inlet, pressure outlet, adiabatic wall and symmetry boundary condition.

gas mechanism, thermal and transport data are imported with chemkin files. I used species transport model in fluent. ALL the material properties are set followed the instructions in literature. Actually I am trying to reproduce results of a published paper. The whole modeling work is so simple that I can finish it in 10 minutes.

I ignite the mixture by patching a 2000K temperature to the whole computation domain like the author did.

However, the whole system becomes unsteady after calculation starts. The maximum temperature reaches 5000K which is the limited value in fluent. The temperature contour becomes a messy.

I tried to reduce URF or step-by-step convergence strategy. However, nothing works.

Since the whole model is so simple. I really can not know what is wrong with my setting. Can anybody who has experience on similar projects give me some suggestions?

I put the screenshot of residuals and temperature contour in this thread.

Best regards

Weiqiang