[YUPeng]

Hello
I want an UDF that computes volume fraction and temperature of one phase(the primary phase or the second phase) in two phase flow at each cell as fluid flows in order to calculate a coefficient to adjust the calculation at the end of iteration.Part of the code is shown as follows.It compiles well,but when I exectue it for the calculation，the error(received a fatal signal(Segmentation fault)) occours.

I would be appreciated if you could help me on this

Thankyou very much

Part of the code is shown as follows:

DEFINE_EXECUTE_AT_END(d_sum)
{
real d;
real d_sum=0;

cell_t cell;
Thread **pt;
Thread *cell_threads;
Domain *mixture_domain;
mixture_domain=Get_Domain(1);

mp_thread_loop_c(cell_threads,mixture_domain,pt)
{
begin_c_loop(cell,pt[0])
{
d=C_VOF(cell,pt[0])*C_R(cell,pt[0]);
d_sum+=d;
C_UDMI(cell,pt[0],0)=d_sum;
}
end_c_loop(cell,pt[0])
}
printf("sum:%g\n",d_sum);
}

[`e`]

You're using user-defined memory (with C_UDMI to store 'd_sum'), have you allocated memory by enabling at least one memory locations (Define > User-Defined > Memory...)?

[YUPeng]

Thank you for your reply,the user-defined memory has been allocated,but once I used C_VOF() in DEFINE_EXECUTE_AT_END(d_sum) to computes volume fraction, the error(received a fatal signal(Segmentation fault)) occoured.So I calculate it in the Source term, and the code runs well. I have read the POST(http://www.cfd-online.com/Forums/flu...-fraction.html), the code which is similar to mine can run well.Now Iwant to know what went wrong,please give me some advice.