[MayTheFlowBeWithYou]

Dear CFD Online people,

In trying to run a simulation for a membrane (in 2D) I run into a problem when I try to use UDF's. Through commenting stuff out I have boiled the problem down to the following script (I have left everything else out for simplicity). The problem arises in the "Get_Domain" part:


#include "udf.h"

DEFINE_ON_DEMAND(get_coords)
{
Domain *domain;
domain = Get_Domain(1);
}


Interpreting this works perfectly, however, when I run it I get the following:

"Error: received a fatal signal (Segmentation fault).
Error Object: #f"

I can't figure out why and how to fix this, the rest of the simulation as of now consists of two laminar flow going in counter-current through a 2D "tube", separated by a wall along the length of the "tube".

I think it could be the domain ID being incorrect somehow, but I have no idea why it would be wrong.

I use Fluent R17.1

Thank you very much for helping me.