How can know which cell is currently calculated?
 

I'm using the User_Defined_Real_Gas_Model. When I code for the following subroutine

Real_Gas_Density(P,T,YI[]) { .... }

I need to know which cell is currently calculated by Fluent. However, FLUENT doesn't pass cell,thread to this subroutine.

Does anybody know how to solve this problem?

Thank very much!