display udf
 

hi all ,
i have this udf but i can'nt display it in fluent ;

#include <udf.h>
DEFINE_PROPERTY (dyn_surf_tension, cell, thread)
{
real dst;
real t=CURRENT_TIME;
dst=141121*pow(t,5) - 38978*pow(t,4) + 3817.5*pow(t,3) - 148.84*pow(t,2) +
1.3033*pow(t,1) + 0.071;
return dst;

thank you