Perhaps I'm blind but I can't find how to get the area of a face in the UDF manual. I see F_AREA(A,f,t) but this gives the face normal. I hope I don't have to calculate it using: Area = F_FLUX/F_R/(F_U^2+F_V^2+F_W^2)^0.5! Have I missed the obvious?

Hi John,

The face area corresponds to the magnitude of the face normal vector.

Therefore, you have :

face normal vector = F_AREA(A,f,t)

face area = magnitude of face normal vector = NV_MAG(A)

and it yields in your code source :

/* Face area */

F_AREA(A,f,t);

At=NV_MAG(A);

where At stands for the face area

Hope it could help,

Anthony