Why is the ANSYS Fluent DPM histogram showing a different number of particles than where tracked?

- January 25, 2023 at 7:17 am
  
  FAQ
  Participant
  
  The DPM (Discrete Phase Model) histogram shows the number of particles only. However, Fluent uses parcels for tracking. Each parcel contains a number or particles that behave in the same way. This concept is explained in the Fluent 19.1 User’s Guide, part II, chapter 23.1.1.3. Parcels: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v191/flu_ug/flu_ug_sec_dpm_concepts.html This concept also applies when using DEM (discrete element method) collisions. If you want to track each particle, you can change the “Parcel Release Method” that you can find for each injection on the “Parcel” tab. This is only available for transient particle tracking. See also Fluent 19.1 User’s Guide, part II, chapter 23.2.2. Steady/Transient Treatment of Particles: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v191/flu_ug/flu_ug_sec_discrete_unsteady.html Keep in mind that you might need a significantly smaller time step size and significantly more computational time when increasing the number of parcels.

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