Drag Models

In EDEM, commonly used drag models for spherical and non-spherical particles (based on sphericity) have been implemented.

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.

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, you specify 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, you must specify the fluid density and viscosity and particle scale factor used.Only one drag model should be applied per simulation.
Haider & Levenspiel Drag You must 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, you must specify the fluid density and viscosity and particle scale factor used. Only one drag model should be applied per simulation.
Ganser Drag You must 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, you must specify the fluid density and viscosity and particle scale factor used.Only one drag model should be applied per simulation.


 

Using Drag Models

  1. Select Particle Body Force from the Interaction menu in the Physics section of the Creator.
  2. Select one of the Drag models from the menu and then select Configure to define the settings. 
    You cannot apply more than one drag model to the simulation. However, this is not recommended as the drag models are designed as stand-alone models.
  3. Import a Velocity field using the Field Data Manager or specify a fixed velocity in the drag model.

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