Solid Species
 

Hi Everyone;
I am trying to write a UDF for the surface deposition for the application in Fluent, however don't know what will be the index used to address the mass fraction of a solid species. For instance, the first species in the mixture species list is as zeroth and the last one is for the bulk species.What is the index for solid ?
F_YI(f,t,??)
regards,
Ehsan