Retrieving species in UDF

Fernando

Hi to all. I am working on a combustion simulation case, using flamelet PDF, for which I have created a couple of UDFs. The problem is that I need to retrieve the species mass fractions and when I use the C_YI(c,t,i) an ACCESS_VIOLATION error message comes up when I try to run the case. This normally works fine when I use the Species Transport model, and I thought that the species could be retrieved using the order specified in the materials panel. Anybody has any ideas how the individual species mass fractions can be retrived in a UDF when using the PDF model? Many thanks. Regards. Fernando.