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udf problem.. output data comes out to "zero"

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Old   August 11, 2012, 07:06
Default udf problem.. output data comes out to "zero"
  #1
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Jong Hwan Park
Join Date: Oct 2011
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startup0820 is on a distinguished road
Hi Guys~

I am trying to output to a point w-velocity.

but, All values are output "0".

----------------------------------------------------------------------

#include "udf.h"

#define ID1 5 /*ID of the point*/


DEFINE_EXECUTE_AT_END(monkeymagic)
{
FILE *fp;
Domain *d;
real x[ND_ND];
Thread *t;
cell_t c;
real w=0, time=0;

fp = fopen("velocity.txt","w");
d = Get_Domain(4);
t = Lookup_Thread (d, ID1);
begin_c_loop(c, t)
{
C_CENTROID(x,c,t);

w= (C_W(c,t));

}
end_c_loop(c, t)

time=CURRENT_TIME;
fprintf (fp, "%f\n",time);
fprintf (fp, "%f\n",w);
fclose(fp);
}

----------------------------------------------------------------------

If I fix this problem,

Base on this udf source, I will generate 200 points and output velocity.(x, y, z velocity)

Plz anyone help me

What`s the problem of the source code?
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Old   August 12, 2012, 23:07
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Ji Junjie
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Location: Shanghai, China
Posts: 102
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gearboy is on a distinguished road
Is this a multiphase problem? Why use "4" in the "Get_Domain"? Usually it should be d = Get_Domain(1) for a single-phase case.

d = Get_Domain(4);

Quote:
Originally Posted by startup0820 View Post
Hi Guys~

I am trying to output to a point w-velocity.

but, All values are output "0".

----------------------------------------------------------------------

#include "udf.h"

#define ID1 5 /*ID of the point*/


DEFINE_EXECUTE_AT_END(monkeymagic)
{
FILE *fp;
Domain *d;
real x[ND_ND];
Thread *t;
cell_t c;
real w=0, time=0;

fp = fopen("velocity.txt","w");
d = Get_Domain(4);
t = Lookup_Thread (d, ID1);
begin_c_loop(c, t)
{
C_CENTROID(x,c,t);

w= (C_W(c,t));

}
end_c_loop(c, t)

time=CURRENT_TIME;
fprintf (fp, "%f\n",time);
fprintf (fp, "%f\n",w);
fclose(fp);
}

----------------------------------------------------------------------

If I fix this problem,

Base on this udf source, I will generate 200 points and output velocity.(x, y, z velocity)

Plz anyone help me

What`s the problem of the source code?
gearboy is offline   Reply With Quote

Old   August 13, 2012, 00:17
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  #3
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Jong Hwan Park
Join Date: Oct 2011
Posts: 12
Rep Power: 4
startup0820 is on a distinguished road
Hi, gearboy
Thanks for your answer!
Changed the get domain value 4-> 1
But same results comes out.
What is the problem?
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Old   August 15, 2012, 23:09
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blackmask will become famous soon enough
If I guess correctly, after
t = Lookup_Thread (d, ID1);
t is NULL

The following thread should help you with your task.

Write data in UDF similar to XY-plot

Last edited by blackmask; August 16, 2012 at 00:43. Reason: additional information
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