5. Contact models — LIGGGHTS v3.X documentation

# 5. Contact models

This section describes what granular models can be used along with pair gran and fix wall/gran :

## 5.1. cohesion commands

Click on the style itself for a full description:

easo/capillary/viscous | sjkr | sjkr2 | washino/capillary/viscous

## 5.2. model commands

Click on the style itself for a full description:

hertz | hertz/stiffness | hooke | hooke/stiffness

## 5.3. rolling_friction commands

Click on the style itself for a full description:

cdt | epsd | epsd2 | epsd3

## 5.4. surface commands

Click on the style itself for a full description:

sphere | superquadric

## 5.5. tangential commands

Click on the style itself for a full description:

history | no_history