# For boundary conditions combining roller boundary and enforced displacement

**URL:** <https://community.freefem.org/t/for-boundary-conditions-combining-roller-boundary-and-enforced-displacement/3698>\
**Category:** General Discussion\
**Created:** [January 21, 2025, 6:01am UTC](https://community.freefem.org/t/for-boundary-conditions-combining-roller-boundary-and-enforced-displacement/3698 "2025-01-21T06:01:05Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Ayataka](https://avatars.discourse-cdn.com/v4/letter/a/848f3c/32.png) [@Ayataka](https://community.freefem.org/u/Ayataka)\
**Post date:** [January 28, 2025, 9:55am UTC](https://community.freefem.org/t/for-boundary-conditions-combining-roller-boundary-and-enforced-displacement/3698/5 "2025-01-28T09:55:59Z")

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Dear François Bouchut

Thank you very much for your reply and your patients.  
I consider employing the linear easticity (Hooke’s law).

Referring the topic you gave me , [Normal boundary condition - #12 by k-matsushima-19](https://community.freefem.org/t/normal-boundary-condition/341/12)  
is this how I should do it?

Add a penalty term to prevent movement normal to the roller boundary?..

Sincereley  
Ayataka

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