[abhinavgupta88]

Hi
I have a 2D Geometry attached is the picture. I have a material in the middle which shrinks 0.5 inch in 5 hours the left and the right walls. I wrote the following UDF but it did not work.
#include "udf.h"
#include "dynamesh_tools.h"

/************************************************** ********************/
/***** UDF for displacer motiion *****/
/************************************************** ********************/

DEFINE_CG_MOTION(displacer_func_Piston_West, dt, vel, omega, time, dtime)

{

Thread *t;
face_t f;
real a = 3.215;
real pai = 3.141592654;

/* reset velocities */
NV_S (vel, =, 0.0);
NV_S (omega, =, 0.0);

if (!Data_Valid_P ())
return;

t=DT_THREAD (dt);



vel[0] = 0.0000007055 ;


}

DEFINE_CG_MOTION(displacer_func_Piston_East, dt, vel, omega, time, dtime)

{

Thread *t;
face_t f;
real a = 11.536;
real pai = 3.141592654;

/* reset velocities */
NV_S (vel, =, 0.0);
NV_S (omega, =, 0.0);

if (!Data_Valid_P ())
return;

t=DT_THREAD (dt);



vel[0] = -0.0000007055 ;


}

Please help