Linear Cohesion V2

This cohesion model is an update to the Linear Cohesion model and was first available in EDEM 2017.2. This model is an improvement on the Linear Cohesion model as it is better 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 takes the form:

 

 

 

where A is calculated as:

 

 

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

 

 

Where R₁ and R₂ are the radius of the particles in contact. In the case where the 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” (F_V2) and “Linear Cohesion” (F) model will be:

 

 

For the case of a uniform particle size distribution, this means:

 

 

 

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 the case where the element 2 is a geometry the force is two times smaller:

 

 

 

 

 

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

Use:

1. Select Edit Contact Chain > Additional models and select Linear Cohesion V2

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