# Lubrication effect

**URL:** <https://forum.itascainternational.com/t/lubrication-effect/926>\
**Category:** PFC\
**Created:** [February 16, 2023, 3:36am UTC](https://forum.itascainternational.com/t/lubrication-effect/926 "2023-02-16T03:36:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mehrdad](https://avatars.discourse-cdn.com/v4/letter/m/e0b2c6/32.png) [@mehrdad](https://forum.itascainternational.com/u/mehrdad)\
**Post date:** [February 16, 2023, 3:36am UTC](https://forum.itascainternational.com/t/lubrication-effect/926/1 "2023-02-16T03:36:12Z")

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Hello everyone,  
I am trying to model the lubrication effect of water on sand particles and friction between them in PFC 3D. Is there a contact model capable of capturing this behavior in PFC?  
Thank you

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**Author:** ![dblanksma](https://avatars.discourse-cdn.com/v4/letter/d/858c86/32.png) [@dblanksma](https://forum.itascainternational.com/u/dblanksma)\
**Post date:** [February 21, 2023, 6:13pm UTC](https://forum.itascainternational.com/t/lubrication-effect/926/2 "2023-02-21T18:13:04Z")

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Hello @mehrdad,

I am not familiar with any contact model that addresses this kind of effect. [Here](https://docs.itascacg.com/pfc700/pfc/docproject/source/manual/pfc_model_components/contacts/contact_built-in.html?node2527) is a list of all contact models in PFC 7.0. And [here](https://docs.itascacg.com/pfc700/pfc/docproject/source/manual/optional_features/plugins/cmodel_plugins.html?node3421) is some documentation on developing your own contact model for PFC.

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**Author:** ![mehrdad](https://avatars.discourse-cdn.com/v4/letter/m/e0b2c6/32.png) [@mehrdad](https://forum.itascainternational.com/u/mehrdad)\
**Post date:** [February 21, 2023, 6:37pm UTC](https://forum.itascainternational.com/t/lubrication-effect/926/3 "2023-02-21T18:37:00Z")

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Thank you very much.