[Mr.Rioes]

Hey,
at the moment I am working on a project, where I need an UDF to read the mass flux on an inlet. The inlet is a pressure inlet, and the simulation will be run in 2D.

I've looked in many forums and threads around how this would be possible, an I found the F_FLUX function.
But i don't get the code running. Everytime Fluent tries to start the UDF it crashes.

I get the error:

=============================

============================================

Node 999999: Process 14860 : Recieved signal SIGSEGV.

===============================================
===============================================

.....

MPI Application rank 1 exited before MPI_Finalize() with status 2
The fl process could not be started.


The code I am running at the moment is:

DEFINE_EXECUTE_AT_END(mass_flow_update)
{

Domain *d1;
Thread *t1;
face_t f;

d1 = Get_Domain(5);
t1= Lookup_Thread(d1, 17);


flow = F_FLUX(f,t1);


act_mass_flow_inlet = flow / area_factor;
act_mass_change = act_mass_flow_inlet * CURRENT_TIMESTEP;

Message("Mass flow this timestep is: %f\n",act_mass_change);

}

[upeksa]

If you are running a single phase simulation, you should use
d1 = Get_Domain(1);

[Mr.Rioes]

Okay thank you it worked,
I thought i had to use the ID I see in fluent, because I splitted my mesh into several areas.