[herko]

Hello everyone,

I am relatively new to CFD modeling and have been working in Fluent on the 2021 R2 version of the ANSYS workbench. I am using a discrete phase model and am having an issue where I have written a UDF and whenever I try to create an injection, Fluent returns the message:
"The Parcel model is not compatible with the udf-injection-init.
The model will be disabled and the standard parcel release method will be applied." I would like to use the constant-mass parcel release method, but as it is now, Fluent will only let me run the standard parcel release method.

I am not sure why my udf is not working, any help with this matter would be greatly appreciated! I have attached the relevant portion of my udf below and specified the settings for the injection as well.

UDF:
DEFINE_DPM_INJECTION_INIT(init_Intelligent,I) /*Init for particles by Intelligent option */
{
Particle *p;

loop(p,I->p)
{
PP_USER_REAL(p, 0) = 0.;
PP_USER_REAL(p, 1) = PP_MASS(p) * (p->number_in_parcel);

PP_USER_REAL(p, 2) = 10.0; /* Intelligent option */

PP_POS(p)[2] = 0.1; /* for check */
}
}

Injection Information:
X-pos(m):-2.538
Y-pos(m):0.84
Z-pos(m):3.6576
X-vel(m/s):11.0475
Y-Vel(m/s):-3.6024
Z-vel(m/s):0.89408
Diameter(m):0.0001092
Temperature(K): 283.15
Flow Rate(kg/s):0.0021373
Start Time(s):0
Stop Time(s):4.0909
Drag Law: dynamic drag
Breakup: breakup enabled, TAB model used with y0=0, breakup parcels=2
Injection type: single
Particle type: droplet
Material: water-liquid
Evaporating species: h2o
Stochastic tracking: Discrete random walk model and random eddy lifetime enabled, number of tries = 1, Time-scale constant = 0.15
Parcel release method: constant mass
Parcel mass: 1*10^-6
UDF Initialization: init_intelligent::UDF_UM