UDF creating a pulse input

mwood · May 24, 2013, 19:04

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

blackmask · May 24, 2013, 20:47

Remove the space between # and include in the first line and try again.

mwood · May 24, 2013, 20:50

Hey,

Thanks!

However, no such luck.

Any other ideas?

blackmask · May 24, 2013, 21:56

See this thread (http://www.cfd-online.com/Forums/flu...e-error-2.html).

mwood · May 26, 2013, 18:20

no luck with that thread either. If it were saved in the wrong spot would that cause this error?

borhan_sd@yahoo.com · May 28, 2013, 08:20

Hi all ,I’m new in fluent and particularly UDF, I want to model a system that a gas is inlet and it flows for 3s and doesn’t flow for 3s alternatively and continuously. In fact it’s 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.

May 24, 2013, 19:04	UDF creating a pulse input	#1
mwood New Member Megan Wood Join Date: Jan 2013 Posts: 9 Rep Power: 14	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

May 24, 2013, 21:56		#4
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 22	See this thread (http://www.cfd-online.com/Forums/flu...e-error-2.html). Last edited by blackmask; May 25, 2013 at 00:42.

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May 24, 2013, 20:47		#2
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 22	Remove the space between # and include in the first line and try again.

May 24, 2013, 20:50		#3
mwood New Member Megan Wood Join Date: Jan 2013 Posts: 9 Rep Power: 14	Hey, Thanks! However, no such luck. Any other ideas?

May 26, 2013, 18:20		#5
mwood New Member Megan Wood Join Date: Jan 2013 Posts: 9 Rep Power: 14	no luck with that thread either. If it were saved in the wrong spot would that cause this error?

May 28, 2013, 08:20		#6
borhan_sd@yahoo.com Member soodabe Join Date: Apr 2013 Posts: 40 Rep Power: 14	Hi all ,I’m new in fluent and particularly UDF, I want to model a system that a gas is inlet and it flows for 3s and doesn’t flow for 3s alternatively and continuously. In fact it’s 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.