[maryam74121]

hi everybody
im using udf in simulation and i wrote it from help examples bud when i want to initilize or calculate my projet i get this error
chip-exec: unsteady_velocity: wrong return type: float udf function expected
Error: received a fatal signal (Segmentation fault).

Error: received a fatal signal (Segmentation fault).
Error Object: #f
could you please help me?
this is my udf
#include "udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
if (t<10)
F_PROFILE(f, thread, position) = 50*t;
else
F_PROFILE(f, thread, position) = 500;
}
end_f_loop(f, thread)
}

[MayTheFlowBeWithYou]

#include "udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
if (t<10)
{
F_PROFILE(f, thread, position) = 50*t;
}
else
{
F_PROFILE(f, thread, position) = 500;
}
}
end_f_loop(f, thread)
}

[maryam74121]

Originally Posted by MayTheFlowBeWithYou

#include "udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
if (t<10)
{
F_PROFILE(f, thread, position) = 50*t;
}
else
{
F_PROFILE(f, thread, position) = 500;
}
}
end_f_loop(f, thread)
}

Thank you I've done this before unfortunately it doesn't work

[KaLium]

what happens if you use this?

 
{
F_PROFILE(f, thread, position) = 50.0*t;
}
else
{
F_PROFILE(f, thread, position) = 500.0;
}

[maryam74121]

it still has this error kalium
Error: received a fatal signal (Segmentation fault).
Error Object: #f

[MayTheFlowBeWithYou]

but is the "chip-exec: unsteady_velocity: wrong return type: float udf function expected" part still there?

[maryam74121]

No it doesn't have that error thank you😊but
it still has this error
Error: received a fatal signal (Segmentation fault).
Error Object: #f

[MayTheFlowBeWithYou]

What if, instead of

real t = CURRENT_TIME;

you put

real t = 1;

Does that still give you still give you the errors?? Basically I can only recommend commenting parts of the code out until you find exactly which part causes the error. The "segmentation error" is a very ambiguous error unfortunately.

[maryam74121]

i changed it to real t =1 but still have segmentation fault
Updating solution at time level N...chip-exec: unsteady_velocity: wrong return type: float udf function expected
Error: received a fatal signal (Segmentation fault).

[MayTheFlowBeWithYou]

Oh sorry, I meant 1.0 to keep it as a float. But it probably wont matter that much. Maybe do something like:


#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real time;
begin_f_loop(f, thread)
{
time=1.0;
if (t<10.0)
{
F_PROFILE(f, thread, position) = 50.0*t;
}
else
{
F_PROFILE(f, thread, position) = 500.0;
}
}
end_f_loop(f, thread)
}

If this works, you could change:

time=1.0;

to

time=CURRENT_TIME;

Other than that I have ran out of ideas, I have used F_PROFILE many times and there is nothing wrong with the way you're using that.

[maryam74121]

it doesnt work
thank you
best wishes

[sumagaji]

Hello every one,
I am Ansys Fluent to simulate heat flux on the cylindrical pipe and I use the following codes but after a successful interpretation I calculate but have this error.
chip-exec: heat flux wrong return type: void udf function expected
error: received a fatal (segmentation fault).
error object: # f
anticipate your kind help.
The codes are:
#include "udf.h"
#include "sg.h"
DEFINE_ON_DEMAND(copy_uds_to_udm)
{
Domain*d=Get_Domain(1);
Thread*t;
cell_t c;
thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
C_UDMI(c,t,0)=C_UDSI(c,t,0);
}
end_c_loop(c,t)
}
return;
}
DEFINE_SOURCE(heat_flux, c, t, dS, eqn)

{

real source;

dS[eqn] = 0.0;

source = C_UDMI(c,t,0);

return source;

}

please can someone help me

[AlexanderZ]

what a re you trying to do?
what do these lines mean?

C_UDMI(c,t,0)=C_UDSI(c,t,0);
source=C_UDMI(c,t,0);

Here source is not defined in UDF (may be you use patch tool.... may be,but), because UDMI_0 is not defined yet.
If source is not define, than the scalar is not define - > UDSI_0 is not defined.
So you got segmentation error, which means some variable is not defined.

best regards

[sumagaji]

Thank you AlexanderZ for the response

Originally Posted by AlexanderZ

what a re you trying to do?

I have multiple nonuniform data points in XYZ and want to hook the data on surfaces body.

what do these lines mean?

C_UDMI(c,t,0)=C_UDSI(c,t,0);
source=C_UDMI(c,t,0);

I already interpolated the nonuniform data to UDS_0 after enabling it before interpolate. The first line is to store the data to UDM_0 from UDS_0. what i found that the data will not be stored to UDM_0 after interpret UDF unless i execute the UDF.
As for the second line is to hook the stored values from Memory to solid cell zone.

Here source is not defined in UDF (may be you use patch tool.... may be,but), because UDMI_0 is not defined yet.
If source is not define, than the scalar is not define - > UDSI_0 is not defined.

How should i define the source, UDMI_0 and UDSI_0 ?