Problem with Non-Premixed model (coal burner)
I´m modeling a coal burner with non-premixed model. I´ve got one fuel stream (coal) and two oxidizer stream with different compositions.
I must apply two-mixture-fraction approach.(three stream with different composition).DPM iteraction every 25 continuous phase iteraction.
I´ve a problem about this approach:
Fluent update properties continuous phase every ten iterations. I plot some variables (temperature,O2,mass flow rate).
When Fluent do this update properties, these variables increase or decrease its value too much (example: Tempearture changes from 2000 K to 500 K approximately, it changes from 500 to 2000 at the next update it happens every 10 iterations).
The solution can´t converge because of these great changes of the fluid properties.I don´t understand this approach.
Could somebody explain me two mixture fraction approach?
How can i converge my case?
My english is so bad.I´m sorry.
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