[Tarantino]

Hello!

I want to return an assigned pressure to a pressure outlet BC and do some math based on in a UDF. I want also to return mass flow rate.
Here is a part of udf that need to do so:

#include"udf.h"
real flow_tot, p;

DEFINE_ON_DEMAND(Pressure_flow)
{
Domain *d; 
real flow;
cell_t c;
Thread *t;
face_t f;

d = Get_Domain(1); 
t= Lookup_Thread(d, 29);

begin_f_loop(f,t)
{
flow+=F_FLUX(f,t);
}
end_f_loop(f,t)
p = C_P(c,t);
printf("gauge pressure = %g\n", p);
printf("Mass Flow Rate: %g\n",flow);
flow_tot =flow;
flow=0.;
}

However, when I compile and Execute-on-demand, then I got the following error:

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Node 0: Process 13808: Received signal SIGSEGV.

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

Node 1: Process 17288: Received signal SIGSEGV.

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

Node 3: Process 17844: Received signal SIGSEGV.

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

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

Node 999999: Process 16332: Received signal SIGSEGV.

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

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

Node 5: Process 12176: Received signal SIGSEGV.

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

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

Node 6: Process 17444: Received signal SIGSEGV.

==============================================================================
MPI Application rank 0 exited before MPI_Finalize() with status 2
 The fl process could not be started.

Anyone know the problem?
Thanks.

[Svetlana]

What pressure boundary condition do you want to set, if you write it in English and maths formulas?

For the mass flow rate you can add a monitor point, you do not have to add it to the UDF