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how to compiled udf ?

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Old   November 14, 2010, 23:42
Question how to compiled udf ?
  #1
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zhangzhiyan
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hi all
i do have no idea about udf, udf1:

#include "udf.h"


static real v_prev = 0.0;


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


{


Thread *t;


face_t f;


real NV_VEC(A);


real force, dv;



/* 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 */


t = DT_THREAD(dt);



/* compute pressure force on body by looping through all faces */


force = 90.0;


begin_f_loop(f,t)


{


F_AREA(A,f,t);


force += F_P(f,t) * NV_MAG(A);


}


end_f_loop(f,t)



/* compute change in velocity, i.e., dv = F * dt / mass


velocity update using explicit Euler formula */


dv = dtime * force / 50.0;


v_prev += dv;


Message ("time = %f, x_vel = %f, force = %f\n", time, v_prev,


force);



/* set x-component of velocity */


vel[0] = v_prev;


}


it can be compiled like that:



but udf 2:
#include "udf.h"
#include "unsteady.h"
#include "memory.h"
#include "stdlib.h"
#include "stdio.h"
DEFINE_CG_MOTION(movewall,dt,vel,omega,time,dtime)
{
Thread *t;
cell_t c;
real cx,cy;
//CArray<real,real&> vx,vy;
int i;
int n=0;
//if(!Data_Valid_P())
//return;
t=DT_THREAD(dt);
cx=0;
cy=0;
begin_c_loop(c,t)
{
//vx.Add(C_U(c,t));
//vy.Add(C_U(c,t));
cx=cx+C_U(c,t);
cy=cy+C_V(c,t);
n++;
}
end_c_loop(c,t);
cx=cx/n;
cy=cy/n;
cx=0;
cy=0.05;
vel[0]=cx;
vel[1]=cy;
//Message("\n n=%d, vx=%f, vy=%f\n",n,vel[0],vel[1]);
}
it can not be compiled :



is anyone can help me?

thanks.
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Old   November 15, 2010, 06:55
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I can't see pictures about error:-(
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Old   November 19, 2010, 02:53
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Quote:
Originally Posted by lehoang_mai View Post
I can't see pictures about error:-(
thank You lehoang_mai
i have slover that problem
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