In pulse tube crycooler, during CFD analysis of it, we must enter pressure oscillation as input. The pressure oscillation repeats itself after a cycle is over. How to write UDF for pressure inlet in FLUENT?
Hi,
First of all I think you should not use research-gate for asking questions, you can get answers to by going to Fluent manual (for example Fluent 6.3, UDF manual, chapter 8.2.1 Boundary Conditions) - in my opinion you're (kind of) lazy!
Second of all...this is what it says in the manual and all you need to do is write your own sin function and read it in Fluent as a pressure inlet bc and not velocity inlet bc,
Best regards,
Matevz
/**********************************************************************
unsteady.c
UDF for specifying a transient velocity profile boundary condition
***********************************************************************/
#include "udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = 20. + 5.0*sin(10.*t);
}
end_f_loop(f, thread)
}
Hi,
First of all I think you should not use research-gate for asking questions, you can get answers to by going to Fluent manual (for example Fluent 6.3, UDF manual, chapter 8.2.1 Boundary Conditions) - in my opinion you're (kind of) lazy!
Second of all...this is what it says in the manual and all you need to do is write your own sin function and read it in Fluent as a pressure inlet bc and not velocity inlet bc,
Best regards,
Matevz
/**********************************************************************
unsteady.c
UDF for specifying a transient velocity profile boundary condition
***********************************************************************/
#include "udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = 20. + 5.0*sin(10.*t);
}
end_f_loop(f, thread)
}
The code Matez wrote is for unsteady velocity, not pressure. According to FLUENT manual:
#include "udf.h"
DEFINE_PROFILE(unsteady_pressure, thread, position)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = 101325.0 + 5.0*sin(10.*t);
}
end_f_loop(f, thread)
}
I want to write udf for breathing cycle of human respiratory tract. Could any one help me to write this ?
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