REAC line, and the SOOT_YIELD parameter

[Salvatore Longobardo]

good morning
I would like to know if it is possible to assign to the REAC line, the SOOT_YIELD parameter variable over time, the value 0.07 in the pre-flash-over phase and 0.14 in the post-flash-over phase

thank you

[Randy McDermott]

For a single REAC line the SOOT_YIELD is always the post flame yield (complete reaction).  If you want to take under-ventilated combustion into effect, set N_SIMPLE_CHEMISTRY_REACTIONS=2 on the COMB line.  Read up on this in the user guide.  The reaction is broken up into 2 steps, the first converting FUEL C to either CO or SOOT.  The second step oxidizes them.  You can tune the post-flashover soot yield by changing FUEL_C_TO_CO_FRACTION, a value of 1 means all FUEL carbon goes to CO (no SOOT) and a value of 0 means all FUEL carbon goes to SOOT (no CO).

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[Salvatore Longobardo]

grazie, ho capito

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[Randy McDermott]

Prego!

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