We have moved the forum to https://forum.ngsolve.org. This is an archived version of the topics until 05/05/23. All the topics were moved to the new forum and conversations can be continued there. This forum is just kept as legacy to not invalidate old links. If you want to continue a conversation just look for the topic in the new forum.
If a computation domain has two subdomains \Omega1 and \Omega2, how do we obtain the inner edges and boundary edges (remove the interface edges) of a subregion, and how do we integrate over them?