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Fluent udf Error: received a fatal signal (Segmentation fault)

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Old   February 24, 2016, 20:54
Default Fluent udf Error: received a fatal signal (Segmentation fault)
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Hello,

I am trying to write a udf that would access some boundary face values and store them in a UMD_I memory and am encountering the Error: received a fatal signal (Segmentation fault).

This is my udf:

#include "udf.h"
#include "sg.h"
#include "flow.h"
#include "unsteady.h"

/* constants for calc_AlvPPs*/
#define MO2 15.999 /* oxygen molar mass g/mol*/
#define MCO2 44.01 /* carbon dioxide molar mass g/mol*/
#define InWalZoneID 8.0 /* ID of wall on cylinder where values will be accessed */

DEFINE_EXECUTE_AT_END(calc_AlvPPs)
/* calc_AlvPPs - function name */
{
Domain *d;
Thread *t;
cell_t c;
face_t f;

real MFaO2;
real MFaCO2;
real PaO2;
real PaCO2;
real Pa = 0;
real MeanMolarMass;

d = Get_Domain(InWalZoneID);

thread_loop_f (t,d)
{
begin_f_loop (f,t)
{
Pa += F_P(f,t);
MFaCO2 = F_YI(f,t,0);
MFaO2 = F_YI(f,t,1);
MeanMolarMass = 1/(MFaCO2/MCO2 + MFaO2/MO2);

PaCO2 = Pa*MFaCO2*MeanMolarMass;
PaO2 = Pa*MFaO2*MeanMolarMass;

F_UDMI(f,t,0) = PaCO2;
F_UDMI(f,t,1) = PaO2;
}
end_f_loop (f,t)
}
}


Even when I comment out the inside of the threat_loop_f out I still get this error.
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Old   February 25, 2016, 02:51
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Cees Haringa
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Maybe a stupid remark, but did you initialize the UDMIs you are calling? A segmentation fault typically tells FLUENT tries to access a non-allocated memory location.
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Old   February 29, 2016, 16:44
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Hi CeesH thanks for the message, I believe I had by clicking define-> user defined -> memory. There is currently two user-defined memory locations in the Fluent setup.
As I mentioned I get this error even if I comment out everything in the thread_loop_f loop.
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Old   December 9, 2016, 16:28
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ali
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Syble,

Did you solve this? I am having similar issue and I printed some messages at different parts of the code to see where the error is being generated and saw that when I use "thread_loop_c (t,domain)" I get the error. not sure why? any idea?

Quote:
Originally Posted by syble View Post
Hello,

I am trying to write a udf that would access some boundary face values and store them in a UMD_I memory and am encountering the Error: received a fatal signal (Segmentation fault).

This is my udf:

#include "udf.h"
#include "sg.h"
#include "flow.h"
#include "unsteady.h"

/* constants for calc_AlvPPs*/
#define MO2 15.999 /* oxygen molar mass g/mol*/
#define MCO2 44.01 /* carbon dioxide molar mass g/mol*/
#define InWalZoneID 8.0 /* ID of wall on cylinder where values will be accessed */

DEFINE_EXECUTE_AT_END(calc_AlvPPs)
/* calc_AlvPPs - function name */
{
Domain *d;
Thread *t;
cell_t c;
face_t f;

real MFaO2;
real MFaCO2;
real PaO2;
real PaCO2;
real Pa = 0;
real MeanMolarMass;

d = Get_Domain(InWalZoneID);

thread_loop_f (t,d)
{
begin_f_loop (f,t)
{
Pa += F_P(f,t);
MFaCO2 = F_YI(f,t,0);
MFaO2 = F_YI(f,t,1);
MeanMolarMass = 1/(MFaCO2/MCO2 + MFaO2/MO2);

PaCO2 = Pa*MFaCO2*MeanMolarMass;
PaO2 = Pa*MFaO2*MeanMolarMass;

F_UDMI(f,t,0) = PaCO2;
F_UDMI(f,t,1) = PaO2;
}
end_f_loop (f,t)
}
}


Even when I comment out the inside of the threat_loop_f out I still get this error.
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