# Coupled PDEs with interface BCs

**URL:** <https://community.freefem.org/t/coupled-pdes-with-interface-bcs/1333>\
**Category:** General Discussion\
**Created:** [November 17, 2021, 4:49pm UTC](https://community.freefem.org/t/coupled-pdes-with-interface-bcs/1333 "2021-11-17T16:49:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sumantkr](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/sumantkr/32/2681_2.png) [@sumantkr](https://community.freefem.org/u/sumantkr)\
**Post date:** [November 17, 2021, 4:49pm UTC](https://community.freefem.org/t/coupled-pdes-with-interface-bcs/1333/1 "2021-11-17T16:49:29Z")

</div>

Dear all

I have gone for the interface boundary conditions example that is given in the [domain decomposition](https://doc.freefem.org/models/domain-decomposition.html).

I have implemented this concept into coupled PDEs having two square subdomains with a conformal interface boundary in them but unfortunately, it is not working for me.

Any examples or suggestions would be helpful for me. So, please help me!!!