I need to inject two different kinds of particles in FLUENT. so two different injection must be defined. one injection is defined by inert particles and another injection is defined by combusting coal particles. for each type of injection I need to define 4 different injection to inject particles with different velocities. so totally I defined 8 injections (4 injections for inert particles and 4 injections for combusting particles). Now I want to save the different properties of these injections using UDF. in my UDF how can I distinguish between the particles of each injection. for one injection I can write the UDF, but for more than 1 injection I can not.