continuity residual divergence
 

Hi, I am quite new in Fluent. I am working on NOX creation by natural gas combustion simulation with turbulence model and flames interactions. I used basic options like K-epsilon (standard), P1 ...
With first order solution I got URF like in the picture. Continuity is still raising and I have only slow computer so I can not waste computational time with waiting if the solution will converge or not, if I think that now it will diverge.

Can somebody help me with this?

P.S.: If I will use symmetry (half of the boiler), do I need to set fluid flow at mass-flow inlets for only for the half of the real problem or do I need to use real values (real mass flow inlet value for natural gas is 1.42 ks/s)?

Thank you very much for any response.