[youhane]

hello everybody,

Can any one help me please. I'm working with an UDF that makes the velocity inlet in a pipe varies with respect to the average temperature of a wall (THREAD_ID(t)==2 in my UDF).

The UDF works perfectly when the thread_id concerned is a wall, but when I change the wall by a surface (2d domain) by changing the THREAD_ID(t) in the code, Fluent generate this error:

Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: ()

This is my udf code:

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity_profile, th, position)
{
Domain *d; /* declare domain pointer since it is not passed as an
argument to the DEFINE macro */
face_t f;
real tavg = 0.;
Thread *t;
real tempe,volume,vol_tot,area;

real A[ND_ND];

d = Get_Domain(1); /* Get the domain using Fluent utility */

/* Loop over all cell threads in the domain */
thread_loop_f(t,d)
{
/* only use thread with id=2 */
if (THREAD_ID(t)==2) {
/* Loop over all cells */
begin_f_loop(f,t)
{

tempe = F_T(f,t);
area=NV_MAG(A);

vol_tot += area;
tavg += (tempe*area);

}
end_f_loop(f,t)
tavg /= vol_tot;

}
}

begin_f_loop(f, th)
{
if ( tavg <= 298. )
F_PROFILE(f, th, position) = 0.5;
if ( tavg > 301.4 )
F_PROFILE(f, th, position) = 0.;
}
end_f_loop(f, th)
}