[anthony05]

I am trying to add mass to the continuous phase from particles using DEFINE_DPM_SOURCE.

The compound I want to add to the continuous phase is part of a mixture and the amount released is governed by particle temperature and a user defined scalar.

Currently the code adds co2 to the continuous phase but not the amount I have calculated. Does anyone have any ideas of how to solve this? Maybe something to do with the units of C_DPMS_YI.

Thanks in advance.

The code for the transfer to the continuous phase is:

DEFINE_DPM_SOURCE(dpm_source, c, t, S, strength, p)
{

Material *m = THREAD_MATERIAL(t);
char *name = "co2";
int i;
i = mixture_specie_index(m,name);

k=150000.0*exp(-200000.0/(P_T(p)*8.314));

mass1=k*P_USER_REAL(p,0);

C_DPMS_YI(c, t, i) += mass1*udf_dpm_relax*strength;
}

[habo]

Status Ansys Fluent 17.2

Most C_ function are not designed to assign values (see UDF user guide 17.2 p. 279)
Therefor C_DPMS_YI(c, t, i) is not suitable to add CO2.

Looking in the manual for the definition of DEFINE_DPM_SOURCE (p. 203) you see that S is the so called source structure point to the cell which can be used to assign values.

On page 207 you can see an example using the source pointer like:

S->species[h2o_index] += mp_dot;

you may also assign
S->mass
S->energy
S->species_concentration
...

cheers