Time dependent angular velocity calculation UDF
 

Hi ,

I have written this udf for evaluating time dependent angular velocity of a turbine by calculating torque at each time step and then using torque value to calculate omega.

#include"udf.h"
real w_prev= 0.0;
DEFINE_CG_MOTION(turbine, dt,vel,omega,time,dtime)
{

Thread *t;
face_t f;
real NV_VEC(A);
real force,torque,x[ND_ND], dw;
NV_S(vel,=,0);
NV_S(omega,=,0);
if (!Data_valid_P())
return;
/* Get the thread pointer for which this motion is defined */
t= DT_THREAD(dt);
/* Compute pressure force of body by looping through all faces */
force = 0;
torque= 0;
begin_f_loop(f,t)
{
F_AREA(A,f,t);
F_CENTROID(x,f,t)
torque+= x[1] * (F_P(f,t)* F_AREA(A,f,t);
}
end_f_loop(f,t)

/* Compute change in angular velocity */
dw= dtime* torque/ 50.00;
w_prev= w_prev + dw;

Message ("time = %f , z_omega= %f,torque = %f\n", time, w_prev, torque);
/* Set Z Component of Angular velocity */
omega[2]= w_prev;
}


When I am compiling this udf, I am getting this error

CMD.EXE was started with the above path as the current directory.
UNC paths are not supported. Defaulting to Windows directory.


Can anyone please help me

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