Hello Everyone ,

I am giving sinusoidal oscillatory motion to a 3D airfoil about longitudinal axis (lateral oscillations ) . How can I define "X-axis" as axis of rotation .

As you know that by default Z-axis is axis of rotation .

My Code is as follow ;

# include "udf.h"

DEFINE_ZONE_MOTION(sinusoidal,omega,axis,origin,velocity,time,dtime)

{

real w = 2.0*M_PI*0.5; real wt = w*time; real axis[1]; real th, thd;

th = -0.017453*sin(wt); thd = -0.017453*w*cos(wt);

*omega = thd;

}