请问：udf不提示出错，顺利激活，就是不起作用

hugeforest

中间我尝试用message输出一些参数的信息，但是在TUI窗口上什么都没有显示，不知道问题究竟出在什么地方，麻烦大家帮我看看，谢谢大家。
下面是写的udf：

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

/* velocities */
static real v_invalve1 = 0.0;
static real v_exvalve1 = 0.0;

/* displacement */
static real s_invalve1 = 0.0;
static real s_exvalve1 = 0.0;

static real lift = -0.0015;

DEFINE_CG_MOTION(invalve1,dt,vel,omega,time,dtime)
{
        Thread *t1, *t2;
        face_t f;
        real NV_VEC(A);
        real force, dv, a, ds;
        Domain * domain;

        int zone_id1=81;
        int zone_id2=91;

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

        if (!Data_Valid_P())
        return;

        /* get the thread pointer for which this motion is defined */
        domain=THREAD_DOMAIN(DT_THREAD(dt));
        t1=Lookup_Thread(domain,zone_id1);
        t2=Lookup_Thread(domain,zone_id2);

        /* compute pressure force on body by looping through all faces */
        force = 0.0;
        begin_f_loop(f,t1)
        {
                F_AREA(A,f,t1);
                force += F_P(f,t1) * A[1];
        }
        end_f_loop(f,t1)

        begin_f_loop(f,t2)
        {
                F_AREA(A,f,t2);
                force += F_P(f,t2) * A[1];
        }
        end_f_loop(f,t2)
               
        /* compute change in velocity, i.e., dv = F * dt / mass
        velocity update using explicit Euler formula */
        a=force/0.1089;
        ds=0.5*a*dtime*dtime;
        if(s_invalve1+ds<=lift)
        {
                v_invalve1=(lift-s_invalve1)/dtime;
                s_invalve1=lift;
        }
        else if(s_invalve1+ds>=0)
        {
                v_invalve1=(0-s_invalve1)/dtime;
                s_invalve1=0;
        }
        else
        {
                dv = dtime * a;
                v_invalve1 += dv;
                s_invalve1 += ds;
        }
        Message ("time = %f, y_vel = %f, force = %f\n", time, v_invalve1, force);

        /* set y-component of velocity */
        vel[1] = v_invalve1;
}