Hello, I am new to PETSc, and I am struggling to use it for some numerics problems. The mathematical capabilities are well explained in the manual, in several tutorials and examples.
But I am stuck at every tiny step, because I cannot find the required functions for all the very basic technical details, like getting the vertex coordinates of a DMPlex, the face areas and cell volumes (if available through PETSc?). Merging two DMPlexes, that share a common boundary, into one. Extracting a boundary of one DMPlex as a new DMPlex. Etc. Is there any technical introduction that shows how to deal with the data structures on a basic, geometrical and topological level without necessarily discussing the numerics of PDEs and equation systems? Thank you Hermann
