Fix the velue of variables use DEFINE_PROFILE

scubme

Hi all fluent users. I am simulating a model. In the simulation, I need fix the velocity of some cells to zero when they meet the given conditions. I used macro DEFINE_PROFILE, and hook it on the FLUID panel (turn on Fixed Values option). The problem I meet is that the UDF fixed all cells, rather than the especial cells. I can not find out the reason. Anybody pls give me any advices, and any discuss is welcome.

The UDF as follow: /*************************************/

#include "udf.h" #include "mem.h"

#define EPS1 0.000001

DEFINE_PROFILE(fixed_u, t, ii) {

cell_t c;

real x[ND_ND];

real err0,err1;

begin_c_loop(c,t)

{

C_CENTROID(x,c,t);

err0=fabs(x[0]-0.25);

err1=fabs(x[1]+0.083333);

if(err0<EPS1 && err1<EPS1)

{Message("%f,%f\n",x[0],x[1]);F_PROFILE(c,t,ii)=0.0;}

}

end_c_loop(c,t)

Message("fixed_u is end. \n");

}

DEFINE_PROFILE(fixed_v, t, ii) {

cell_t c;

real x[ND_ND];

real err0,err1;

begin_c_loop (c,t)

{

C_CENTROID(x,c,t);

err0=fabs(x[0]-0.25);

err1=fabs(x[1]+0.083333);

if(err0<EPS1 && err1<EPS1)

{Message("%f,%f\n",x[0],x[1]);F_PROFILE(c,t,ii)=0.0;}

}

end_c_loop (c,t)

Message("fixed_v is end.\n");

}