UDF, defining diffusivity
 

Dear All,

I'm trying to write an UDF to modify the diffusivity of species. I have met the following difficulties:

1. I received an error mesage during the compiling: "macro 'C_DIFF_L' used with only 3 args". I have put one more argument, but I don't know what does it represent?

2. I managed to compile the source, but there still was an error message: "label 'M_spe_multicomponent-j' not found" and trying to iterate I received a 'SEGMENTATION VIOLATION' message. What could be the reason?

3. How can I obtain the molecular weight of species i?

Thank you in advance for any help, Robi