Learning Forum

[jeanbarbosa]

I am trying to simulate a laminar counterflow diffusion flame and the flame extinguish after 200 iterations. 

What I am doing is: first I run the cold flow case to obtain an initial guess with the finite rate/no TCI for chemistry interaction in species transport. After that, I set the volumetric rate on the species transport section, patch a temperature of 1500 K and run the calculation again. 

I am not sure what I am doing wrong. 

[Rob]

Possibly nothing. What stabilises the flame?

[jeanbarbosa]

Thanks for the reply, Rob.
I think that what you mean is if the system has a kind of flame holder, is that right?

My case deals if impinging jets, one with fuel and the other one with the oxidizer. The flame should be near the stagnation region on the oxidizer side.
I do not know if I can place something like a flame holder in the system because it will alter the flow field.

[Rob]

Yes, but if you're using an opposing jet system the contact region may do the same thing. Check things like AFR and where you are relative to the flammability limits. knows more about the combustion models, I just did "real" combustion chemistry at Uni.

[jeanbarbosa]

Thanks, Rob.
I will check the AFR and the flammability limits.
I let you know when I have progress.