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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › How can the ‘number of particles’ in a parcel can be less than 1 ? › Reply To: How can the ‘number of particles’ in a parcel can be less than 1 ?

June 20, 2023 at 4:43 pm
Rob
Forum Moderator

A particle is what we track (diameter & material density) but the parcel (some number of particles, can be fractional values) is what arrives at the other end when it hits/reacts/whatever with something. 

The terms were mis-used back in the very early days of Fluent's DPM model so are incorrectly used by nearly everyone. In the example, we're tracking 1212 parcels, and you have a total of 9.39e-4 particles in the domain. At each time step if the injection is active and it's a surface injection you're adding 12 parcels.Â