[isabel]

Hello everybody,

I want to program a F_UDMI with the value of 10*temperature. First, I programmed it as a C_UDMI and it worked Ok. But when I program it as a F_UDMI, I have this error:


Error: FLUENT received fatal signal (ACCESS_VIOLATION) Note exact events leading to error.
Save case/data under new name.
Exit program and restart to continue.
Report error to your distributor.



The C++ program as C_UDMI (which works Ok) is this:

#include "udf.h"
DEFINE_ON_DEMAND(function)
{
Domain *d;
Thread *t;
cell_t c;
d=Get_Domain(1);
thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
C_UDMI(c,t,0)=10*C_T(c,t);
}
end_c_loop(c,t)
}
}



The C++ program as F_UDMI (which fives the violation error) is this:


#include "udf.h"
DEFINE_ON_DEMAND(function)
{
Domain *d;
Thread *t;
face_t f;
d=Get_Domain(1);
thread_loop_f(t,d)
{
begin_f_loop(f,t)
{
F_UDMI(f,t,0)=10*F_T(f,t);
}
end_f_loop(f,t)
}
}


Does anybody know why the code runs Ok as a C_UDMI and not as a F_UDMI ???

[Bocliff]

Greetings from Tibet,

I believe the problem is that while C_T and C_UDMI are stored by FLUENT on all cell zones, F_T and F_UDMI are not stored on all face zones (for example, they are not stored on interior face zone faces). You could add the following to avoid trying to access a null pointer in your code:

thread_loop_f(t,d)
{
if (T_STORAGE_R(t, SV_T) != NULL) &&
T_STORAGE_R_XV(t, SV_UDM_I, 0) != NULL)
{
begin_f_loop(f,t)
{
F_UDMI(f,t,0)=10*F_T(f,t);
}
end_f_loop(f,t)
}
}

This will fill the storage on zones on which it exists.

Bocliff

[Bocliff]

This workaround will certainly get you going as it will avoid NULL pointer but I was wondering if this is what you really want to do? Using DEFINE_ON_DEMAND to fill in some arrays is OK but I was wondering if you really wanted to operate on a particular thread? Maybe you just want to setup some boundary condition on a boundary or some source in interior?

Just a thought.

Bocliff Sutter

"May your yak keep front end in your tent"

[Farid]

For those who faced the same problem.

You can't use F_UDMI and F_UDSI to store the information of interior, fan, and radiator. Instead of that use C_UDMI:

#include "udf.h"
DEFINE_ON_DEMAND(function)
{
Domain *d;
Thread *t;
face_t f;
d=Get_Domain(1);
thread_loop_f(t,d)
{
begin_f_loop(f,t)
{
C_UDMI(F_C0(f,t),t->t0,0)=10*F_T(f,t);
}
end_f_loop(f,t)
}
}