Yes, I am referring to that link.

I understand udfs are fairly advanced.

But to understand what is going on when I parallelize,

I need to reference it with a standard example problem and analyze how the inclusion of '#RP_HOST' '#RP_NODE' and noninclusion of RP_HOST and RP_NODE makes a difference in total_area or total_force. Without examples, it is hard to understand as ansys documentation does not show any examples.

Based on looking at the UDF i understand that it is being used to compute the total pressure on a face zone.

So please tell me if this will work with this problem
1. I have a cylendrical pipe of diameter D = 0.02m, length L=0.4m which has a mass flow rate of Qdot = 0.01kg/s (water). (I am going to set this up as a 2d axis-symmetric problem). I will run a simple laminar simulation.For validation purpose)

a) I will evaluate the pressure drop computed with surface integrals area-weighted average from the GUI

b) I will use the UDF and compute total_force/total_area will these two numbers match?

Do you think this can be taken as a sample problem for this UDF or does this correspond to any other problem? (This is the confusion, for which problem does this UDF correspond to)