[virgy]

Hi
I want to simulate a simple pipe (radius= 0.0005 m) in 3D. The inlet has 2 boundary conditions written with UDF:
-the first boundary condition is the parabolic profile of velocity
- the second one is a parabolic profile of mass fraction of a species without reaction along the pipe.

I calculate the velocity with UDF (it works) and I save it in a file .dat.
After Fluent has calculated it, I keep the file .dat with the profile of velocity, I turn off the Navier-Stokes model and I activate the species model (I'd like to separate Navier-Stokes model and species model because it reduces the the time of simulation).
The UDF for the mass fraction is correctly interpreted by Fluent, I can select my UDF profile in species mass fraction boundary condition, but when I press the button "calculate" I receive this message: "FLUENT received fatal signal (ACCESS_VIOLATION)".

Does anybody know what to do? Can I give two different UDF in this way? Is there anything wrong in my UDF?



My UDF for mass fraction of a species is here:



# include "udf.h"
# include "mem.h"

DEFINE_PROFILE (indop, thread, nv)
{
face_t f;
real x;
real y;
real n[ND_ND];
real coeff = 0.01;
real r = 0.0005;
real r2 = (pow((r),2));

begin_f_loop (f,thread)
{
F_CENTROID(n,f,thread);
x=n[0];
y=n[1];

F_YI(f,thread,nv)= coeff-(coeff/r2) * ( (pow((x),2))+(pow((y),2)) );
}
end_f_loop (f,thread)
}


Thanks a lot,
Virgy