Divergence problem
 

Hi experts. I'm new on CFD forum and Fluent.
I am working on my project which is simulating counterflow methane flame. My mesh info and residuals figure are attached. I encountered divergence problem and I've tried many time still cannot find where is wrong. Please help me to solve this. Thank you!

Divergence
 

Mesh is only one aspect. You need to look at the physics being modeled and the models that are enabled. Initialization is another important aspect. Last, but not the least, numerical setup should be good. You have 13 species in your model, including radicals, that are not easy to model because the reactions are stiff. If you are not looking at some non-equilibrium phenomenon, then prefer to reduce the reaction chemistry; use elementary reactions.