particle number concentration in a volume

DH

Hi, I am trying to get the particle number concentration in a fluid volume which I specified in my 3D chamber model. Now I finished the DPM simulation (interaction with continous phase), and would like to figure out how to post-process to get the number concentration in the small region. can you please advise me?

Here is my coding and error message.

#include "udf.h"

#include "dpm.h"

#include "surf.h"

DEFINE_ON_DEMAND(p_number) {

Domain *d=Get_Domain(1);

cell_t c;

int id;

int n=0;

Particle *p;

Thread *c_thread=Lookup_Thread(d,4); /*In my case 4 was the id of the sampling volume */

Alloc_Storage_Vars(d, SV_DPM_PARTICLE_BIN, SV_NULL);

bin_particles_in_cells(d);

begin_c_loop(c, c_thread) {

begin_particle_cell_loop(p,c,c_thread)

{

if (p->part_id < 10000) /*10000 particles were injected injected in the chamber */ {

n =+ 1; }

Message(" particle_number=%i",n); }

end_particle_cell_loop(p,c,c_thread) }

end_c_loop(c, c_thread)

Free_Storage_Vars(d, SV_DPM_PARTICLE_BIN, SV_NULL);

}

Error: FLUENT received fatal signal (ACCESS_VIOLATION)

1. Note exact events leading to error.

2. Save case/data under new name.

3. Exit program and restart to continue.

4. Report error to your distributor.

Error Object: ()