# soot , urgent

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 March 31, 2005, 20:20 soot , urgent #1 caty Guest   Posts: n/a Hello everybody, I have a big pool fire 25*16.5 m2 in a domain of 125*100*50. (fuel kerosene, heat release 670 MW) When looking at the soot mass fraction profiles I see that i dont have a value of 0 except at the wind inlet 1 m distance. The fire is located at the distance of 50 m from the wind inlet. Even in the far away regions I have a mass fraction of 4e-4 and as I said practically no regions with 0 soot mass fraction. What do you think about this?

 April 3, 2005, 18:27 Re: soot , urgent #2 Glenn Horrocks Guest   Posts: n/a Hi, Isn't a mass fraction of 4e-4 close enough to zero? If you want to get closer to zero, try converging tighter and/or using double precision numerics. Glenn Horrocks

 April 5, 2005, 21:16 Re: soot , urgent #3 caty Guest   Posts: n/a Hi Glenn, thank you for your suggestion.The domain is large, so i would expect that the soot mass fraction to be 0 in the far field, no?? Indeed the soot mass fraction and the nuclei are harder to converge. I am doing a transinet simulation and i can get tight convergence on each timestep for the rest of variables, but the soot hmm it is more difficult. Is there a way to speed the convergence for the soot?

 April 6, 2005, 15:32 Re: soot , it is really working? #4 caty Guest   Posts: n/a I read on other forum that there are some problems with the Soot model in CFX. In my case the simyulation crash when adding the soot. I have tried 2 cases: 1)to runn it with the option Fuel consumtion reaction on- in this case the simulation crashed : fatal overflow in linear solver 2) to runn it without this option and in this case I think the results are not accurate Does anyone has a solution for this problem???

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