[jjchristophe]

I am using Fluent 6.3 under linux.
I wrote udf in order to simulate specific boundary conditions.
For one of my udf, I can compil it (as compiled udf) and load it without problem. But when I select it in the boundary condition window, I have the following message:
"fluent.6.3.26 received a fatal signal (SEGMENTATION VIOLATION)"
does any body have a clue?
here is my udf's code:

#include "udf.h"
#include "unsteady.h"
DEFINE_PROFILE(pressure_outlet_S,thread,i)
{
real A[ND_ND]; /* face's area */
real Q=0.; /* volume flow rate @ thread @ previous time step */
real t=CURRENT_TIME; /* current time */
face_t f;
float u,v,w,vn,R;
/* output of pressure outlet for 1st time step */
if (t=0.)
{
begin_f_loop(f,thread)
{
F_PROFILE(f,thread,i)=200.;
}
end_f_loop(f,thread)
}
else
{
/* computation of thread's flow rate @ previous time step */
begin_f_loop(f,thread)
{
u=F_U_M1(f,thread);
v=F_V_M1(f,thread);
w=F_W_M1(f,thread);
vn=u*u+v*v+w*w;
vn=SQR(vn);
F_AREA(A,f,thread);
Q=Q+NV_MAG(A)*vn;
}
end_f_loop(f,thread)
/* computation of thread's resistance @ current time step */
R = 0.5+(15.5/Q);
Q=0.;
begin_f_loop(f,thread)
{
u=F_U_M1(f,thread);
v=F_V_M1(f,thread);
w=F_W_M1(f,thread);
vn=u*u+v*v+w*w;
vn=SQR(vn);
F_AREA(A,f,thread);
Q=Q+NV_MAG(A)*vn;
/* output of pressure outlet @ current time step */
F_PROFILE(f,thread,i)=100*R*Q;
}
end_f_loop(f,thread)

}
}