Coupling the equations defined on two different subdomains

[Sabarish_Gopi]

For those who might face such an issue anytime in future, please check the link below:

Solve Poisson equation with non-linear boundary conditions on a submesh

Hello, I’m trying to solve a poisson equation with non-linear boundary conditions in one subdomain of a domain. First, I tried solving the poisson equation in the full domain to check if it is working. The code works fine. But when i try to solve it only in a subdomain using a submesh, i’m not able to get it to work. There is even no change in the geometry of the domains in the first and second case. I’m making some mistake while integrating the poisson solver with the submesh functionality. …