Mixed Function Spaces in Fenicsx

[dokken]

As stated on the top of the link you sent:

Note: this is documentation for an old release. View the latest documentation at docs.fenicsproject.org/dolfinx/v0.9.0/python/demos.html

If you go to the latest documentation, you’ll find
https://docs.fenicsproject.org/dolfinx/v0.9.0/python/search.html?q=MixedFunctionSpace&check_keywords=yes&area=default
along with

FEniCS release notes

Additional resources include
http://jsdokken.com/FEniCS-workshop/src/multiphysics/submeshes.html
http://jsdokken.com/FEniCS-workshop/src/multiphysics/coupling.html
and

Discontinuity at interface using mixed domains

Hi all, Exactly like in this topic I am trying to impose a discontinuity at an interface between two subdomains. This time having two subdomains with only CG elements and coupling them with a dS term. @dokken published this gist that I am trying to adapt in order to have: \frac{u(-)}{K(-)} = \frac{u(+)}{K(+)} \nabla u(-) - \nabla u(+) = 0 However I am struggling to adapt the interface terms to achieve the desired result. This is the DG formulation we had earlier: # Interface F += - dot…