请各位高手帮帮忙！

hellojimmy

我现在要实现的如图所示：

哪位大哥能告诉我该怎么做啊？
UDF附下：
DEFINE_GRID_MOTION(wing, d, dt, time, dtime)
{
Thread *tf = DT_THREAD (dt);
face_t f;
Node *v;
real equ, x;
int n;
/* set deforming flag */
SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf));
equ = cos(2*M_PI*FR*time)*dtime;
begin_f_loop (f, tf)
{
f_node_loop (f, tf, n)
{
v=F_NODE (f, tf, n);
if (NODE_X(v) > 0 && NODE_POS_NEED_UPDATE (v))
{
NODE_POS_UPDATED (v);
    x = NODE_X(v);
NODE_Y(v) += x*equ;
}
if (NODE_X(v) < 0 && NODE_POS_NEED_UPDATE (v))
{
NODE_POS_UPDATED (v);
    x = NODE_X(v);
NODE_Y(v) += -1*x*equ;
}
}
}
end_f_loop (f, tf)
}

东岸线

感觉像鸟的翅膀