[NonStopEagle]

hey guys,

I am trying to write a udf that varies the direction of air over my airfoil from 0 to 14 and back to 0 in 1 sec. While the udf I have written interprets successfully, it does not run. I interpret the udf, and define the x_velocity and y_velocity as values obtained from the udf. But for some reason, the angle of incidence of air never changes as it's supposed to.
One more thing that I noticed is that none of my printf statements are being displayed by ansys fluent.

Here's the udf

#include "udf.h"

DEFINE_PROFILE(x_inlet_velocity, thread, position)
{
real x[ND_ND]; // added
int a = 3;
real v;
real polarity= -1;
face_t f;
real t,ts;

ts = 0.125;


begin_f_loop(f,thread)
{

F_CENTROID(x,f,thread); // added
{
t = RP_Get_Real("flow-time");
{
//a = (int) (t/(tstep*2));

polarity = 1;
v = cos(9*(sin(90*2*ts*(t/ts)*3.1415/180))*3.1415/180)*10.95;
}
}


if(f==0)
{
printf("angle is %d \n", (9*(sin(90*2*ts*(t/ts)*3.1415/180))*3.1415/180));
printf("Flow Time is %f \n",t);
}
F_PROFILE(f,thread,position) = v;
}
end_f_loop(f,thread)

}

DEFINE_PROFILE(y_inlet_velocity, thread, position)
{
real y[ND_ND]; // added
int b= 3;
real v1;
face_t f1;
real t1, ts1 = 0.125;



begin_f_loop(f1,thread)
{
F_CENTROID(y,f1,thread); // added
{
t1 = RP_Get_Real("flow-time");
{

v1 = sin(9*(sin(90*2*ts1*(t1/ts1)*3.1415/180))*3.1415/180)*10.95;
}
}
if(f1==0)
{
printf("Angle verification : %d\n", (9*(sin(90*2*ts1*(t1/ts1)*3.1415/180))*3.1415/180));
}
F_PROFILE(f1,thread,position) = v1;
}
end_f_loop(f1,thread)

}

This udf is only for serial and cannot be used for parallel processing in fluent. Anyway, please do tell me what's wrong here.


NonStopEagle