Hello everyone, I have encountered two problems when using fenics calculation, and I sincerely hope you can give me some directions:
(1) I am currently calculating gas diffusion in long and narrow gaps. Due to the very large aspect ratio, narrow edges tend to have fewer grids in order to reduce the grid, so I am seeking to use a “sub-model” similar to abaqus, that is, first calculate the overall value with the coarse grid, and then cut off part of the area to refine the grid, bringing the boundary value calculated in the previous step. So I get a locally refined solution, but I don’t know how to do that, or is there an alternative?
(2) I want to use different governing equations in two subdomains of a model that are connected by an edge. How do I do this?