[abdihamid]

Hi `e` i am writing a udf code to define a mixture density that related to uds but when i want to initialize the solution this error appears: received a fatal signal (Segmentation fault)
here is my code:
#include "udf.h"
DEFINE_PROPERTY(cell_density,cell,thread)
{
Thread *t;
cell_t c;
real c_h2,c_n2,rh2,rn2,rmix=1,c_mix ;
c_h2 = C_UDSI(c,t,0);
c_n2=40.46-c_h2;
rh2=c_h2*2;
rn2=c_n2*28;
rmix=rh2+rn2;
return rmix/1000;
}
how can i solve the problem help me please

[annan]

Dear abdihamid,
Segmentation fault means you are trying to access something that is not defined.
I can’t understand why you define the thread and cell inside your udf, these two are already given by the DEFINE_PROPERTY macro. I’d suggest you try to remove the lines : “Thread *t; cell_t c;” and replace DEFINE_PROPERTY(cell_density,cell,thread) by DEFINE_PROPERTY(cell_density,c,t)
Hope this will help.
Good luck
Annan

[abdihamid]

Dear annan thank you for your help. I apply the changes you suggested but the error still reamins. i dont know how to solve it.

[`e`]

Have you added at least one UDS to your model? Otherwise, debug your code by determining which line is causing the error.

Originally Posted by annan

I can’t understand why you define the thread and cell inside your udf, these two are already given by the DEFINE_PROPERTY macro. I’d suggest you try to remove the lines : “Thread *t; cell_t c;” and replace DEFINE_PROPERTY(cell_density,cell,thread) by DEFINE_PROPERTY(cell_density,c,t)

This step also needs to be completed because your UDF is calling C_UDSI on the declared variables t and c, but they do not have any values.