Aerosol model

[ahmedahmed2056]

Hello

I have a model of a small trees fire and in front of it is a building. The model is 20 m x 25 m x 10 m. and tThe dimensions of the studied building is 7 m x 3.8 m x 3.5m. whenever i make the soot as Aerosol it gives ( numerical unstability ) error.
All the mesh boundaries are open and it didn't work so i changed to make a periodic in x direction and open in the rest and still the same error. Any other possibilities or possible solutions ?

[rmcdermo]

Input file?

[lihy213]

Please upload your input file and tell if it was solved?