[wasim.raza]

Hi,

I am using steady particle tracking in Fluent. I am trying to set the initial velocity of the particle same as the flow velocity in respective cells of the inlet surface,
I am using UDF, DEFINE_DPM_INJECTION_INIT(velocity_magnitude, I).
But, I am unable to check, whether the initial velocity has been applied to the particle or not. How can I check it?
Also, there is no effect on the result after using the UDF.

Thanks.

Originally Posted by pakk

I would be interested in what happens with the following code:

#include "udf.h"
#include "dpm.h"

DEFINE_DPM_INJECTION_INIT(velocity_magnitude, I)
{

Particle *p;
cell_t c;
Thread *t;

loop(p,I->p_init)           /*Standard Fluent looping Macro to get particle streams in an inejction using unsteady particle tracking*/
{
c = P_CELL(p);              /*Get the cell that the particle is currently in*/
t = P_CELL_THREAD(p);       /*Get the thread that the particle is currently in*/
P_VEL(p)[0] =7;    /*Longitudinal velocity*/
P_VEL(p)[1] = 8;    /*Spanwise velocity*/
P_VEL(p)[2] = 9;    /*vertical velocity*/
}
}

Do you see velocities (0,0,0) or (7,8,9)?

[pakk]

Do you use the code that you quoted which still has problems, or do you include the solution that was given further below?

[wasim.raza]

Originally Posted by pakk

Do you use the code that you quoted which still has problems, or do you include the solution that was given further below?

I have used the code after including the solution as mentioned, by replacing loop(p,I->p_init) with loop(p,I->p). It compiled and it is available in the UDF Tab of particle injection.
I tried with high velocity in the UDF also , but the particle velocity is not changing in the output file sampled at the outlet.
Therefore, I want to check, whether the initial velocity has been applied to the particle or not. How can I do it?
Thanks

[pakk]

Plot one trajectory, showing the particle velocity.