[mozkan26]

Dear friends,

I`m trying to simulate an axisymmetric swirl flow in Fluent with a very simple geometry, attached image shows my geometry and boundary conditions.

At the inlet boundary, radial and swirl velocity components are zero and axial velocity gradient is zero.

Gauge pressure is zero at the outlet and there is a wall with a constant rotational speed.

My UDF file for axial velocity gradient is below but I`m not sure if this is correct because I have difficulties with converging and continuity does not satisfy.

********************
#include "udf.h"

DEFINE_PROFILE(Axial_Velocity_Gradient,t,i)
{
real xf[ND_ND], xc[ND_ND];
face_t f;
cell_t c0;
Thread*t0;
begin_f_loop(f,t)
{
F_CENTROID(xf,f,t);
c0=F_C0(f,t);
t0=THREAD_T0(t);
C_CENTROID(xc,c0,t0);
F_PROFILE(f,t,i)=C_U(c0,t0);
}
end_f_loop(f,t)
}
********************

Many thanks in advance.

Musa

[uconcorde]

Originally Posted by mozkan26

Dear friends,

I`m trying to simulate an axisymmetric swirl flow in Fluent with a very simple geometry, attached image shows my geometry and boundary conditions.

At the inlet boundary, radial and swirl velocity components are zero and axial velocity gradient is zero.

Gauge pressure is zero at the outlet and there is a wall with a constant rotational speed.

My UDF file for axial velocity gradient is below but I`m not sure if this is correct because I have difficulties with converging and continuity does not satisfy.

********************
#include "udf.h"

DEFINE_PROFILE(Axial_Velocity_Gradient,t,i)
{
real xf[ND_ND], xc[ND_ND];
face_t f;
cell_t c0;
Thread*t0;
begin_f_loop(f,t)
{
F_CENTROID(xf,f,t);
c0=F_C0(f,t);
t0=THREAD_T0(t);
C_CENTROID(xc,c0,t0);
F_PROFILE(f,t,i)=C_U(c0,t0);
}
end_f_loop(f,t)
}
********************

Many thanks in advance.

Musa

Hi Musa,

I am facing the similar situation. Did you find out how to fix it?

Many thanks,
Dv

[amineag]

Hello everyone!
I would like to simulate an airflow over a pipe in Ansys Fluent. I want the flow at outlet of the pipe to be swirled.
How can Swirl the flow at the exit of the pipe?
Can I use an UDF to swirl the flow at the exit of the pipe??
Thank you!