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-   -   Premixed combution -- divergence at the first iteration (https://www.cfd-online.com/Forums/fluent/63516-premixed-combution-divergence-first-iteration.html)

 allamarein April 10, 2009 12:10

Premixed combution -- divergence at the first iteration

I am trying to familiarizing with premixed combustion.
I tried to use a duct with map (it's a test geometry).
I use adiabiatic model and k-eps turbulence.

I get
"Error: divergence detected in AMG solver: premixc"
at the first iteration.

Do you have a tutorial about premixed combustion?
I's like to see a working case to understand...

 Laci April 14, 2009 04:07

Quote:
 Originally Posted by allamarein (Post 212560) I am trying to familiarizing with premixed combustion. I tried to use a duct with map (it's a test geometry). I use adiabiatic model and k-eps turbulence. I get "Error: divergence detected in AMG solver: premixc" at the first iteration. Maybe I initialize bad? Do you have a tutorial about premixed combustion? I's like to see a working case to understand...
Have yout tried to solve it step by step? First, without reaction, just air. Then try to calculate with reaction.

 Haniii November 13, 2011 19:31

(Divergence detected in AMG solver: premixc)

Hi
I am trying to use premixed combustion model for a problem that I have solved it without using species. I am getting error from the first time step. "Divergence detected in AMG solver"
Divergence detected in AMG solver, primitive error at node 1" > decreasing coarsening group size"
Divergence detected in AMG solver, primitive error at node 1" > increasing relaxation sweeps"
Also afetr I tried again changing a few parameters such as W-Cycle, Max coarse relaxation and coarsed by, in the Solution Controls windowone or two parameters I got

Divergence detected in AMG solver.

Do you know how can I solve this problem ?

Thank you very much for your help

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