When simulating particulate flows using the dense discrete phase model (DDPM) or discrete element method (DEM) in ANSYS Fluent software, you might want to initialize the case with a certain region filled with particles. Examples of this include an initial static bed in a bubbling fluidized bed simulation and a partially filled rotary drum in a powder mixing simulation. Although it is possible to use standard DPM injection options to continuously inject particles until the desired quantity is reached, this approach is computationally expensive and impractical when the amount of particulate mass to be injected is large. Additionally surface injection from “interior” cell facets is not recommended as this option does not provide good control over injection and may lead to numerical instability.
So what are the options currently available?