[KeganLeckness]

Hi all,

I'm having issues getting my UDF to work properly in my transient analysis. I'm applying it at a pressure-inlet boundary condition. I get the error indicating "chip-exec: wrong return type: void udf function expected." My code is below:

#include "udf.h"

DEFINE_TRANSIENT_PROFILE(impulse_pressure, time)
{
real pressure_value=0.0;
if (time >= 0.0 && time < 0.003)
{
pressure_value= 20000 - 6666.6666667 * time;
}
else
{
pressure_value= 0;
}
return pressure_value;
}

I have no issues interpreting the code. Are there any thought on how to resolve this error?

[Changda]

I have the same problem with you in using DEFINE_TRANSIENT_PROFILE. Did you solve this problem? And how did you solve this problem?

[KeganLeckness]

Hi,

I was able to fix the problem. My goal was a triangular pressure wave that started at 20 kPa at t=0 s and ended at 0 Pa at t=.003 s. The code I now use for that purpose is:


#include "udf.h"

DEFINE_PROFILE(impulse_pressure_20, thread, position)
{
float t, pressure;
face_t f;

t = RP_Get_Real("flow-time");

if (t<.003)
{
pressure = -6666666.667*t +20000;
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = pressure;
}
end_f_loop(f, thread)
}
else
{
pressure =0;
}
}


Hope this helps,
Kegan