[Roozbeh]

Hi all

I want to write a UDF for modifying my DPM phase, using the data of the cell that the particle is currently in.

I chose the DEFINE_DPM_LAW macro for this purpose and for looping over the cells i went with:

begin_particle_cell_loop(pi, c, t) { } end_particle_cell_loop(pi, c, t)

macro.

The final code was:

#include "udf.h"
#include "dpm.h"
#include "dpm_types.h"
#include "dpm_laws.h"
#include "surf.h"

DEFINE_DPM_LAW(LawTryTwentyfour, tp, ci)
{
cell_t c = TP_CELL(tp);
Thread *t = TP_CELL_THREAD(tp);
Particle *pi;


begin_particle_cell_loop(pi, c, t)
{

TP_DIAM(pi) = TP_INIT_DIAM(pi)*(1. - ((C_T(c, t) - 290.) / 20.));

}
end_particle_cell_loop(pi, c, t)

}

Fluent 18.2 compiled it with seemingly no problem. however when i run the case using this law it gives me follwing error:

Node 5: Process xxxx: Received signal SIGSEGV
The fl process could not be started

It also corruptes program as such i cant even reopen my DPM Injection again and i have to close the software and start all over again.

any suggestion about the nature of this error?
or better how could i solve it?

thanks