UDF and random functions
 

Can anybody tell us why Fluent does not interpret UDF with random functions calls (srand, rand)? The error message says that srand and rand are "undeclared variables"... thanks gino

----------------------------------- #include "udf.h" #define RAND_MAX 32767

DEFINE_PROFILE(temp_face,t,i) { real x[ND_ND]; face_t f;

float ran ;

srand( (unsigned) time (NULL) );

begin_f_loop(f,t)

{

ran = rand()/float(RAND_MAX) ;

F_CENTROID(x,f,t);

F_PROFILE(f,t,i) = 310.+2.*(ran-0.5);

} end_f_loop(f,t) void srand( unsigned int seed ); } -------------------------------------

Re: UDF and random functions
 

Ciao Gino, try to compile your UDF. The problem should disappear.Luca

Re: UDF and random functions
 

thanks so much Luca, you are right, now it works! ciao gino