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Old   April 14, 2004, 10:46
Default Udf problem
  #1
Karthick
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Hello all

I am writing a simple udf to get the temperature at each cell during iterations. It is interpreting well. But when I try to run the iterations, it is showing Access_violation error and it comes out.

What may be the problem? Also I am having one more doubt. Whether can I include the udf in between the runs? It is leading to always error. Whether is it permissible in Fluent.

My udf is given below: #include "udf.h" DEFINE_EXECUTE_AT_END(my_execute) { Domain *d;

int ID=2;

Thread *t=Lookup_Thread(d,ID);

cell_t c;

FILE *fp4;

int i;

real temp=0.;

fp4=fopen("temp_zone2.dat","w");

begin_c_loop(c,t)

{

temp=C_T(c,t);

fprintf(fp4,"%g\n",temp);

i++;

}

end_c_loop(c,t) printf("The %d values ", i); fclose(fp4); }

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Old   April 14, 2004, 18:33
Default Re: Udf problem
  #2
Ajay
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Karthik ,

you are missing

d=getdomain(1), use it before

Thread *t=Lookup_Thread(d,ID);

Should work then

-Ajay
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Old   April 15, 2004, 01:51
Default Re: Udf problem
  #3
Karthick
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Since Get_Domain(1) and Thread *t=Lookup_Thread(d,ID) both are same, we can use either of two.

Is it right?

Regards Karthick
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Old   April 15, 2004, 10:05
Default Re: Udf problem
  #4
Ajay
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No they are not the same .

Thread *t=Lookup_Thread(d,ID)

will return a thread pointing to the ID number which you specify .Each boundary or zone is associated with an unique ID. but the other paramter you need which is d the domain pointer is not passed automatically when you use define_execute_at_end you need to get the domain ponter by using d=get_domain(1)

-Ajay
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