laminar combustion / methane-air

Volker Pawlik

Does someone has experience with laminar flame modelling in Fluent? Maybe also concerning a methane-air reaction problem?

I tried to simulate the combustion of a houshold burner with a laminar flame. The fluent database reaction parameters for a one-step methane-air reaction modelled by the Arrhenius equation were employed. The solving process was started basing on a converged cold flow solution, with high temperature values (about 2000K) patched, where the flame was supposed to be situated. After an initial starting of the reaction the flame "extinguished" during the iterative solving process, when the temperature was limited to the adiabatic flame temperature. With higher temperature limits the reaction zone moved to the inlet of the model keeping the solution process unconverged.

Neither the patching of products nor the use of a two-step reaction scheme brought success.