how can calculate normal vector in fluent
 

hi all
im using fluent V19

I would like to know how to find the normal vector from the fluent.

I can print easily in CFDpost, but how do I do it in Fluent?

Additionally, what would happen if the meaning of force x,y,z in cfx was expressed as an expression?
I want to express force x,y,z and normal x,y,z as an expression