Murari Iyengar
Ansys Employee

Hi, you can refer 2.3. Model-Specific DEFINE Macros ( for UDF macros. You can also refere Appendix B. DEFINE Macro Definitions ( for additional macros. You can create it using Named Expressions also. To do this, you can create multiple NE, one for every variable and a last one for conductivity which is dependant on these variables.