1. 入口速度是位置的函数，以抛物线形入口为例：

#include "udf.h"
#include "math.h"
DEFINE_PROFILE(inlet_x_velocity, thread, position)
{
 real x[ND_ND];              
 real y;
 face_t f;
 begin_f_loop(f, thread)
   {
     F_CENTROID(x,f,thread);
     y = x[1];
     F_PROFILE(f, thread, position) = 1.5*1.0*4.0/0.1681*y*(0.41-y);
   }
 end_f_loop(f, thread)
}

2.入口速度是时间的函数：

#include "udf.h"
#include "math.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{face_t f;
  begin_f_loop(f, thread)
  {real t = RP_Get_Real("flow-time");
     F_PROFILE(f, thread, position) = 0.0333*t/sqrt(t*t+0.0001);}
  end_f_loop(f, thread)}