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annie19880

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#include "udf.h"

DEFINE_GRID_MOTION(wind001,domain,dt,time,dtime)
{
  Thread *tf = DT_THREAD(dt);
  face_t f;
  Node *v;
  real NV_VEC(omega),NV_VEC(axis),NV_VEC(dx);
  real NV_VEC(origin),NV_VEC(rvec);
  real sign;
  int n;

  /*set deforming flag on adjacent cell zone */
  SET_DEFORMING_THREAD_FLAG(THREAD_TO(tf));

  sign = -5.0 * sin (26.178 * time);

  Message ("time = %f, omega = %f\n", time, sign);
  NV_S(omega, =, 0.0);
  NV_D(axis, =, 0.0,1.0,0.0);
  NV_D(origin, =, 0.0, 0.0, 0.512);

  begin_f_loop(f,tf)

  {
   f_node_loop(f,tf,n)
   {
    v = F_NODE(f,tf,n);

        /* update node if x position is greater than 0.02
           and that the current node has not been previously
           visited when looping through previous faces */
   if (NODE_X(v) > 0.02 && NODE_POS_NEED_UPDATE (v))
   {
           /* indicate that node position has been update
              so that it's not updated more than once */
           NODE_POS_UPDATED(v);

           omega[1] =  sign * pow (NODE_X(v)/0.230, 0.5);
           NV_VV(rvec, =,NODE_COORD(v), -,origin);
           NV_CROSS(dx, omega, rvec);
           NV_S(dx, *=, dtime);
           NV_V(NODE_COORD(v), +=, dx);
   }
   }
  }
  end_f_loop(f,tf);
}
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