[n_bowen]

Hi,

I am trying to run a simulation of blood flow with a user defined velocity inlet boundary condition.

Here is the udf that I use:

#include "udf.h"
#define PI 3.141592654

DEFINE_PROFILE(inlet_velocity, thread, index)
{
face_t f;
begin_f_loop(f, thread)
double t = (CURRENT_TIME*2-floor(CURRENT_TIME*2))/2;

{
if(t <= 0.218)
F_PROFILE(f, thread, index) = 0.5*sin(4*PI*(t+0.0160236));
else
F_PROFILE(f, thread, index) = 0.1;
}
end_f_loop(f, thread);
}


I get this error as I try to Interpret the function:
line 3: syntax error.

I am going through all example UDF files and cannot see what the problem is.


Thanks for your help.

[upeksa]

#include "udf.h"

DEFINE_PROFILE(inlet_velocity, thread, index)
{
face_t f;
double t;

begin_f_loop(f, thread)
{
t = (CURRENT_TIME*2-floor(CURRENT_TIME*2))/2;
if(t <= 0.218)
F_PROFILE(f, thread, index) = 0.5*sin(4*M_PI()*(t+0.0160236));
else
F_PROFILE(f, thread, index) = 0.1;
}
end_f_loop(f, thread);
}

[n_bowen]

Upeksa,

Thanks for your reply.

It looks like there is a problem with this line: DEFINE_PROFILE(inlet_velocity, thread, index)

since now that I have eliminated the line: #define PI 3.141592654

I'm getting the same error with a change in the line number:
line 2: syntax error

[`e`]

Try using the variable names they have provided in the UDF manual:

DEFINE_PROFILE(inlet_velocity, t, i)

Replace "thread" with "t" and replace "index" with "i". If this correction doesn't eliminate the syntax error, try using an example DEFINE_PROFILE macro to check you're interpreting/compiling and enabling the profile correctly.