Need help in UDF
 

I need some help in writing UDF. I need to write an UDF for solid viscosity which involves the volume fraction, restitution coefficient, solids pressure, second invariant of deviatoric stress tensor and granular temperature.

From the help files, I manage to find the C_VOF(c,t) macro to access to the volume fraction. Please advise how to access to restitution coefficient, solids pressure, second invariant of deviatoric stress tensor and granular temperature.

Thousand thanks for your help and best regards,

bh