[Ramkumar21194]

hi friends, i am a bit new to UDFs in fluent. now iam trying to link the adjust macro with profile so that the boundary condition can be adjusted, but i dont know how to do that. The following is my code to adjust velocity boundary condition:

#include<udf.h>
DEFINE_PROFILE(velocity_inlet,thread,equation)
{
face_t f;
float v=50;
begin_f_loop(f,thread)
{
F_PROFILE(f,thread,equation)=v;
}
end_f_loop(f,thread)
}
DEFINE_ADJUST(velocity_variation_execution,domain)
{
face_t f;
Thread *thread_inlet=Lookup_Thread(domain,12);
Thread *thread_outlet=Lookup_Thread(domain,14);
int i=0;
float v=0,velocity_outlet=0,velocity_inlet=0;
begin_f_loop(f,thread_outlet)
{
v+=F_U(f,thread_outlet);
i++;
}
end_f_loop(f,thread_outlet)
velocity_outlet=v/i;
v=0;i=0;
begin_f_loop(f,thread_inlet)
{
v+=F_U(f,thread_inlet);
i++;
}
end_f_loop(f,thread_inlet)
velocity_inlet=v/i;
if(velocity_outlet<300 && velocity_outlet!=0)
{
F_PROFILE(f,thread_inlet)=velocity_inlet+5;
}
else
{
return;
}
}

if above code is interpreted and run the solver, an error showing "Segmentation violation " within first iteration. could any one please help me with this?..if possible, show me a simple program using adjust macro to change the inlet velocity based on outlet velocity in a convergent nozzle......thanks in advance!!...