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[Solution]

While setting up unsteady DPM, evaluating number of particles per parcel may be done to avoid particle numbers < 1. This makes the setup unphysical. A very large particle number, on the other hand, may result in issues such as high localized sources. Number of particles per parcel can be evaluated as (parcel mass/particle mass). Parcel mass can be obtained as (injection mass flow rate * injection time-step size/no. of streams per injection). Particle mass can be calculated as (particle volume * particle material density) Please refer to the attached PDF file for an example. The attached spreadsheet can be used to quickly key in data to come up with the number of particles per parcel. Attachments: 1. 2054353-particle-number.xlsx
2. 2054353.pdf