[Tushar_Telmasre]

Experiencing a weird problem. solving for simple conduction based solidification.

#include "udf.h"

DEFINE_EXECUTE_AT_END(temp_gradient)
{
Domain *d;

Thread *t;

cell_t c;

d = Get_Domain(1);

thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
C_UDMI(c,t,1) = C_T_M1(c,t);
}
end_c_loop(c,t)
}

}

in the above code I am getting segmentation fault. if I change C_T_M1(c,t) to C_T(c,t) I wont get any fault and solution will proceed.

any idea what might be the reason.

[pakk]

In cases like this, the first thing you look to is the manual. There I looked for "C_T_M1", to see what the manual says about it. Only one page says something about C_T_M1, and this says:

Important: Note that data from C_T_M1 is available only if user-defined scalars are defined. It can also be used with adaptive time stepping.

So that should explain your situation.

(By the way: the name "temp_gradient" suggests that you want to calculate the temperature gradient. But the code looks for the temperature at the previous time step. So your code is wrong, or your name is misleading.)

[Tushar_Telmasre]

thank you.
that solved the problem.

also as you have noted the name is misleading. my ultimate aim is to calculate gradient hence the name of udf is as such.