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Old   March 18, 2011, 03:31
Default Power load UDF
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Hi everybody,
I have a question : i have to write an UDF for a thermal load on a surface (lateral surface of a truncated cone).The thermal load follows the law P(z) = a*z^b where z is the distance from the source.
How could i set up my UDF?
Thx mates.
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Old   March 18, 2011, 04:05
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Hi,
you can do that with DEFINE_PROFILE macro and hook that in heat flux boundary condition.
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Old   March 18, 2011, 05:49
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Thx for your answer
Could it be something like :

Quote:
#include "udf.h"

DEFINE a 1
DEFINE b 2
DEFINE_PROFILE (powerload, t, i)
{
real x[ND_ND];
real y;
real z;
face_t f;

begin_f_loop(f, t)
{
F_CENTROID(x,f,t);
z = x[1];
F_PROFILE(f, t, i) = a*z^b;
}
end_f_loop(f, t)
}
At ND_ND have i to put 3D_3D?
Thx again for your support!

Last edited by Rich1979; March 18, 2011 at 06:06.
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Old   March 18, 2011, 08:34
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it needs some changes:
Code:
#include "udf.h"
#include "math.h"
#define a 1
#define b 2
DEFINE_PROFILE (powerload, t, i)
{
  real x[ND_ND];                
  real z;    
  face_t f;
  begin_f_loop(f, t)
    {
      F_CENTROID(x,f,t);
      z = x[2];
      F_PROFILE(f, t, i) = a*pow(z,b);
    }
  end_f_loop(f, t)
}
it doesn't need to change ND_ND. it automatically adopts itself.
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Old   March 21, 2011, 02:05
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Thx a lot Amir,your advise was very useful!I realized my udf
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