[Davide_PT]

Dear all,

I am new with the use of udf and with C programming.
I am trying to define a function to plot the value of the blending function F2 of the k omega SST. I am not really sure about the DEFINE function to use so this is one of my (unsuccessful) try. It does compile in fluent but whenever I try to plot it on a plane the value is constantly 0 everywhere. I define one UDM to save the variable. Can someone please point me to the issue?

Thanks a lot

#include "udf.h"


DEFINE_SOURCE(f_1,c,t,dS,eqn)
{
real s1,s2,s3,s4;
real source;


s1 = 2*sqrt(C_K(c,t))/(0.09*C_WALL_DIST(c,t)*MAX(C_O(c,t),1.e-10));
s2 = 500*C_MU_L(c,t)/(C_R(c,t)*(C_WALL_DIST(c,t))*(C_WALL_DIST(c,t))*MA X(C_O(c,t),1.e-10));
s3 = MAX(s1,s2);

s4 = (s3*s3);
source = s4;

C_UDMI(c,t,0) = source;

return source;
}