how to retrieve output to a text file!!
 

Hi,
I am a beginner in udf and would love to have your help in the following problem. Thank you very much in advance

I have a udf for accessing the cell information such as its x,y,z coordinate, mixture fraction of species.
Everything is fine, except i dont know how to get this data written into a text file.
I thought it would get displayed in one of the "results" so that i can just "write" it into a file..But now it gets displayed only in the boundary conditions.

Please can someone tell me how do i extract this information on to a text file. the program is as below.

#include "udf.h"
DEFINE_ADJUST(fonction_retour,domain)
{
cell_t c;
Thread *tc;
real xc[ND_ND],x,y,z,tempe,mass_w_i;
int i;
thread_loop_c(tc, domain)
{
begin_c_loop(c, tc)
{
C_CENTROID(xc,c,tc);
x=xc[0];
y=xc[1];
z=xc[2];
tempe= C_T(c,tc);
mass_w_i = C_YI(c,tc,i);
}
end_c_loop(c, tc)
}
}

can't you just use surface monitors, point, and write to a file ???

Thanks for your reply,
To be honest, i just figured out the option FILE *fp function.. is this what you are talking about.. Can you please send some link where it is discribed more.

Thanks,

no, my method does not use UDF... just go to monitors in the left part of you screen, selec create surface monitor, give it your point, and write to a file at each iteration

Hi,
Thanks diamondX,
I dont know how to get the cell coordinates from surface monitor. So i think i dont have any other option other than writing a udf.

THIS IS the updated udf with file write option. I still dont know how to execute this file? It will be really helpful if someone can help me out of this!! Thanks in advance

#include "udf.h"
DEFINE_ADJUST(fonction_retour,domain)
{
FILE *fp;
cell_t c;
Thread *tc;
real xc[ND_ND],x,y,z,tempe,mass_w_i;
int i;
fp=fopen("cell_info.txt","w");
thread_loop_c(tc, domain)
{
begin_c_loop(c, tc)
{
C_CENTROID(xc,c,tc);
x=xc[0];
y=xc[1];
z=xc[2];
tempe= C_T(c,tc);
mass_w_i = C_YI(c,tc,i);
fprintf(fp,"%r %r %r %d\n",x,y,z,i);
}
end_c_loop(c, tc)
}
fclose(fp);
}