[tongx051]

Hello everyone,
I'm very new to UDF. I was trying to write a UDF that can get surface temperature on a wall at the end of the calculation and store it to a UDMI.
Here is the code I wrote:

DEFINE_ON_DEMAND(on_demand)
{

Domain *d;
Thread *t;
face_t f;
d = Get_Domain(1);
t = Lookup_Thread(d, 16); /*16 is boundary ID*/

begin_f_loop(f,t)
{

F_UDMI(f,t,0) = F_T(f,t);

}
end_f_loop(f,t)
When I plot it, there is nothing showing. I guess there must be something wrong in my code, so the temperature is not stored into the UDMI yet. Could anybody help me figure out what I did wrong.