Hi,

I'm trying to write a UDF which will enable me to specify the inlet velocities at a boundary in terms of the z position of the point on the boundary. Can someone tell me what is wrong with my code (this is to specify x-velocity):

#include "udf.h"

DEFINE_PROFILE(unsteady_inlet_x_velocity, thread, position) { real z, x[ND_ND]; face_t f;

begin_f_loop(f, thread)

{

F_CENTROID(x,f,thread);

z=x[1];

F_PROFILE(f, thread, position) = -1*0.129112*(z*10);

}

end_f_loop(f, thread) }

I've used similar UDFs in 2D problems but I'm not sure how to make it work in 3D. I'd appreciate it if someone can help!

Thanks very much,

Peter

hi I think if u need the z coordinate then it should be possibly x[2].The rest seems ok .Hope it helps

regards