# Solve poisson equation with three submeshes

**URL:** <https://fenicsproject.discourse.group/t/solve-poisson-equation-with-three-submeshes/14841>\
**Category:** dolfinx\
**Created:** [May 30, 2024, 9:49am UTC](https://fenicsproject.discourse.group/t/solve-poisson-equation-with-three-submeshes/14841 "2024-05-30T09:49:23Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [May 6, 2025, 6:59pm UTC](https://fenicsproject.discourse.group/t/solve-poisson-equation-with-three-submeshes/14841/11 "2025-05-06T18:59:11Z")

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There are several variations of the Poisson problem with coupling.  
One of them is within FESTIM itself ([GitHub - RemDelaporteMathurin/FESTIM: My personal fork of FESTIM](https://github.com/RemDelaporteMathurin/festim)) and might be hard to parse.  
We have several other versions floating around on discourse, including:  
[Discontinuity at interface using mixed domains - #2 by dokken](https://fenicsproject.discourse.group/t/discontinuity-at-interface-using-mixed-domains/15040/2)  
and the subsequent typo fix by @RemDelaporteMathurin  
as well as:  
[Poisson submesh DG coupling · GitHub](https://gist.github.com/jorgensd/8a5c32f491195e838f5863ca88b27bce#file-problem-py)  
(which is also cross posted multiple times on discourse: [Search results for 'https://gist.github.com/jorgensd/8a5c32f491195e838f5863ca88b27bce' - FEniCS Project](https://fenicsproject.discourse.group/search?q=https%3A%2F%2Fgist.github.com%2Fjorgensd%2F8a5c32f491195e838f5863ca88b27bce))

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