UDF code
 

How should I define two rotations for a moving wing?

This code only simulates the roll but when I add pitch the motion becomes completely wrong.

#include "udf.h"
#include "dynamesh_tools.h"

real w, pi, Aroll, Apitch, roll, droll, pitch, dpitch, yaw, dyaw, frequency, T;
real Ar, Ap, Ay;

DEFINE_CG_MOTION(code, dt, v_cg, omega, time, dtime)

{
Thread *t;

NV_S(v_cg, =, 0.0);
NV_S(omega, =, 0.0);

if (!Data_Valid_P())
{
Message("Wrong\n");
return;
}

t=DT_THREAD((Dynamic_Thread*)dt);

frequency = 3.0;

pi = 3.141592654;

/* define motion variables */

Ar = 30.0; /*roll amplitude*/
Ap = 5.0; /*pitch amplitude*/
Ay = 0.0; /*yaw amplitude*/

Aroll = Ar*pi/180.0; /*conversion to radians*/
Apitch = Ap*pi/180.0; /*conversion to radians*/

w=2.0*pi*frequency; /*omega (radians)*/
T=1.0/frequency;

roll = Aroll*sin(w*time + pi/2);
droll = w*Aroll*cos(w*time + pi/2);

pitch = Apitch*sin(w*time+pi/2);
dpitch = w*Apitch*cos(w*time+pi/2);

/*euler angles initial frame mod 1*/

omega[0] = droll;
omega[1] = 0;
omega[2] = 0;

Message("time:%f omegax:%f omegay:%f omegaz:%f \n", time, omega[0], omega[1],omega[2]);

}

I hope both droll and dpitch is droll/dt and dpitch/dt, looks to be direct differentiation. You need to use droll*dtime and dpitch*dtime to determine delta omega.
Make sure that the cg location is correct because rotation takes place about cg and not about the origin.

It still doesn't work. The problem is that when I use roll or pitch separately the wing motion is ok but when I consider both of them simultaneously the motion becomes wrong.

t=DT_THREAD((Dynamic_Thread*)dt);

I found error in line 21 (t=DT_THREAD((Dynamic_Thread*)dt);)

Can any one find solution to this.My problem is 2D and i m applying only rolling motion.

Aerofoil rolling UDF
 

Structure reference is not implemented is error showing in line21( posted previously)