# 5. Contact models

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

## 5.1. cohesion commands

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

## 5.2. model commands

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hertz | hertz/stiffness | hooke | hooke/stiffness

## 5.3. rolling_friction commands

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cdt | epsd | epsd2 | epsd3

## 5.4. surface commands

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sphere | superquadric

## 5.5. tangential commands

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history | no_history