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UDF creating a pulse input

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Old   May 24, 2013, 19:04
Exclamation UDF creating a pulse input
  #1
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Megan Wood
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Hello

I am trying to create a pulse input to represent my system ideally it would have a 30min pulse every 24hrs. I have a 'line 1: parse error'
and I can't seem to figure it out
This is my code:

# include "udf.h"
DEFINE_PROFILE(velocity_magnitude, t, i)
{
real velocity;
real the_current_time;
face_t f;
the_current_time = CURRENT_TIME;
if ((the_current_time>=0) && (the_current_time<1800))
{
velocity=3;
}
if ((the_current_time>=86400) && (the_current_time<88200))
{
velocity=3;
}
if ((the_current_time>=172800) && (the_current_time<174600))
{
velocity=3;
}
else
{
velocity=0
}
begin_f_loop(f,t)
{
F_PROFILE(f,t,i) = velocity;
}
end_f_loop(f,t)
}

Any help would be much appreciated.

Thanks
Megan
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Old   May 24, 2013, 20:47
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Remove the space between # and include in the first line and try again.
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Old   May 24, 2013, 20:50
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Megan Wood
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Hey,

Thanks!

However, no such luck.

Any other ideas?
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Old   May 24, 2013, 21:56
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See this thread (UDF line 1 parse error ).

Last edited by blackmask; May 25, 2013 at 00:42.
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Old   May 26, 2013, 18:20
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Megan Wood
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no luck with that thread either. If it were saved in the wrong spot would that cause this error?
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Old   May 28, 2013, 08:20
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soodabe
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Hi all ,Iím new in fluent and particularly UDF, I want to model a system that a gas is inlet and it flows for 3s and doesnít flow for 3s alternatively and continuously. In fact itís our respiration flow and the model is a respiratory mask.
How should I write UDF file? Probably CURRENT_TIMESTEP Macro should be used, Is it right?
Would you tell me please how should I write the UDF? This is very important for me.
Thank you very very much in advance.
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parse error, pulse input, udf, varying velocity

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