The Linear Cohesion V2 Model

The Linear Cohesion V2 model is an enhancement over the Linear Cohesion model and was made accessible for the first time in EDEM version 2017.2 due to its improved performance for non-uniform particle size distributions.

Similar to the Linear Cohesion model, this modifies the Base Contact Model by adding a normal cohesion force. This force is described as follows:

where A is calculated as follows:

However, in the “Linear cohesion V2” model, the radius of overlap squared is calculated as follows: 

where R1 and R2 are the radius of the particles in contact in cases where element 2 is a geometry. 

k is a cohesion energy density with units Jm-3.

This means that, for the same input parameters, the ratio between the forces calculated with “Linear cohesion V2” (FV2) and “Linear Cohesion” (F) model will be as follows: 

For the case of a uniform particle size distribution: 

In this case, the cohesive force calculated in the Linear Cohesive V2 model is therefore four times smaller than the one calculated in the Linear Cohesive model (for a uniform particle size distribution). 

In cases where the element 2 is a geometry, the force is two times smaller as follows: 

  

Interaction Configurable Parameters Position
Particle to Particle, Particle to Geometry Click + to add cohesion to particle-particle or particle-geometry interactions. Set the energy density for each interaction. Energy density is the scaling function for the cohesiveness of the material. The SI units of energy density are J/m³. Any
  1. Select Edit Contact Chain > Additional models and then select Linear Cohesion V2.

  2. Click the configuration  icon to define contact model parameters.

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