Unsteady Injection (DPM) for certain amount of particles
 

hi

i am doing some resuspension study, i am doing unsteady simulation and the effect of flow on resuspension, i use UDF for knowing whether the removal force of particles are enough for resuspension or not but the problen is injection takes place several times from one point but in reality the amount of particles in each cell are limited and once they resuspend they should not exist there?

do you please give me some idea about this situation? how i can manage the udf
to not inject the particles from somewhere already emitted particles??