[arriftou]

I am trying to read a large data table (.txt) file into my udf to use it as bondary condition heat flux on a square surface,
I tried some udf ,for example : DEFINE_ON_DEMAND ,DEFINE_EXECUTE_ON_LOADING ,DEFINE_EXECUTE_AFTER_CASE/DATA ,DEFINE_RW_FILE . but it does not work.

can any one help please.

here is my udf ,there is some thing wrong ?

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#include "udf.h"



DEFINE_ON_DEMAND(my_demand)
{
Domain *domain; /* domain is declared as a variable */
domain = Get_Domain(1); /* returns fluid domain pointer */
Thread *t;
cell_t c;
FILE *fp;

fp = fopen ("cubical1.txt","r");

if ( fp != NULL )
{
char line [ 100000 ]; /* or other suitable maximum line size */

while ( fgets ( line, sizeof line, fp ) != NULL ) /* read a line */

}
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