Rémi Delaporte-Mathurin

> I currently have an issue with the version of dolfinx on my environment What's the issue?

@JonathanGSDUFOUR tests pass yay 🎉

Found the culprit line: https://github.com/festim-dev/FESTIM/blob/af31da22cf1fb6ef0b7357b79d1b205b6e7d7a48/festim/generic_simulation.py#L322 Also need to update the documentation: https://github.com/festim-dev/FESTIM/blob/af31da22cf1fb6ef0b7357b79d1b205b6e7d7a48/docs/source/userguide/export_post_processing.rst#L192

@jhdark is this ok to be merged? I would like to merge it before #735 as it may bring some conflicts

I think something like this would work. Based on something @MichaelChristenson proposed For a Sieverts-Sieverts or Henry-Henry interface: ```python import fenics as f class SievertsSievertsMassFlux(F.FluxBC): def __init__(self, surfaces, h_coeff, c_ext,...

> You can do this by specifying the facets to integrate over manually Means we couldn't use `mesh.locate_entities` and `mesh.meshtags` for this but _have_ to tag them manually? > pass...

I've tried adapting the code in the test to @SamueleMeschini 's example but I get an error because when creating the NonLinearProblem. I understand it's because the subdomain data for...

@jpdean @jorgensd I managed to get what I want For each interface (assuming it's only shared between 2 volumes) I look at the first facet and determine what is the...

Update for dolfinx 0.8.0 ```python from dolfinx import mesh, fem, plot, geometry import dolfinx.fem.petsc import dolfinx.nls.petsc from mpi4py import MPI import ufl from petsc4py import PETSc from ufl import grad,...

Thanks to @dokken and @jpdean we now have a prototype for interfaces! ```python # docker run -ti -v $(pwd):/root/shared -w /root/shared jpdean/mixed_domain # SPDX-License-Identifier: MIT from mpi4py import MPI import...