Drag Models

In almost all particle laden flows, drag force has the main contribution in the motion of particles. Therefore, this force needs to be calculated precisely in order to simulate particle-fluid flows successfully. In EDEM, commonly used drag models for spherical and non-spherical particles (based on sphericity) have been implemented.

Name	Description and Parameter Values
Schiller and Naumann Drag	This drag model requires an imported velocity vector field or user defined flow field. In addition, the user specifies the fluid density and viscosity and particle scale factor used. Only one drag model should be applied per simulation.
Morsi and Alexander Drag	This drag model requires an imported velocity vector field or user defined flow field. In addition, the user specifies the fluid density and viscosity and particle scale factor used. Only one drag model should be applied per simulation.
Haider & Levenspiel Drag	This model requires the user to specify the sphericity of each particle type used (default of 1 is a perfect sphere). This value is used in the drag calculation to account for non-spherical particles. This drag model requires an imported velocity vector field or user defined flow field. In addition, the user specifies the fluid density and viscosity and particle scale factor used. Only one drag model should be applied per simulation.
Ganser Drag	This model requires the user to specify the sphericity of each particle type used (default of 1 is a perfect sphere). This value is used in the drag calculation to account for non-spherical particles. This drag model requires an imported velocity vector field or user defined flow field. In addition, the user specifies the fluid density and viscosity and particle scale factor used. Only one drag model should be applied per simulation.

Use:

Select Particle Body Force from the Interaction pulldown in the Physics section of the Creator.
Choose one of the Drag from the menu and select Configure to define the settings. Note that more than one drag model can be applied to the simulation however this is not recommended as the drag models are designed as stand-alone models.
Import a Velocity field via the Field Data Manager or specify a fixed velocity in the drag model.