[igorb]

I'm trying to write my custom Devolatilization law for biomass combustion and I have some hard time figuring how to do it right.
After defining mass and temperature change of the particle in the DEFINE_CUSTOM_LAW macro I have to specify mass and energy source in continuous phase but I don't know how.
I used 2.5.13. chapter of the Fluent UDF guide but without success. The difference is that I use PDF mixture model so my evaporating specie is defined as secondary stream which is not available under species list in materials panel. I tried with C_DPMS_PDF_2(c,t) macro but its not working. So i'm pretty much stuck here and would appreciate any help.

And one other question. When specifying species source with C_DPMS_YI(c,t,n) as in UDF manual is it added as mass fraction, kg/m^3 or in some other unit?

Thanks in advance,
Igor B.