DrAmine
Ansys Employee

Again if you have very low mass / diameter probably the droplets won't be tracked anymore.

Regarding the maximum diameter issue: I do not understand your point. You are modifiying the diameter of the particles if your criteria is fulfiled. You are using Volume Injection so it will inject standard parcels in every cell / number of parcels in the choosen domain. So what does now happen in the cells where the criteria is not fulfilled? By just setting diameter to zero: that won't work: you need to kill all particles which are not required. Perhaps you do that in a DEFINE_DPM_SCALAR_UPDATE where you kill all particle not fulfilling that criteria at the the very first iteration they are tracked. 

 

This topic is going to be very complex and I cannot comment on this anymore without the need to go deep into it.