High absolute 'continuity' residual
 

I am doing a simulation about premix combustion in a 2D round plane (calculation domain was shown in attachment), but 'continuity' residual converges unbearably slow, at the beginning of each iteration, absolute 'continuity' residual reaches 1e5 then decrease to 1e-3 (see attachment). The only boundary condition is an adiabatic wall, I don't know why 'continuity' residual behaves like that, perhaps it is due to species formulas? Thanks in advance.

Models:
Energy;
Laminar;
Speices: Species Transport Model + Volumetric Reactions + Laminar Finite-
Rate + chemkin import mechanism (30 species, 50 reactions)

Materials:
ideal gas

Initial Conditions:
700K, 25bar

Hello,

Could you fix your problem?

Thanks

Hi, enayath
Sorry, I still don't have a solution for that. I just avoided that problem by using a global reaction instead. It would be highly appreciated if someone has any suggestion.