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PETSc's DMPlex interface for unstructured meshes has been extended to supportnon-conformal meshes. The topological construct that DMPlex implements---theCW-complex---is by definition conformal, so representing non- conformal meshesin a way that hides complexity requires careful attention to the interfacebetween DMPlex and numerical methods such as the finite element method. Ourapproach---which combines a tree structure for subset- superset relationshipsand a "reference tree" describing the types of non-conformalinterfaces---allows finite element code written for conformal meshes to extendautomatically: in particular, all "hanging-node" constraint calculations arehandled behind the scenes. We give example code demonstrating the use of thisextension, and use it to convert forests of quadtrees and forests of octreesfrom the p4est library to DMPlex meshes.

Support for Non-conformal Meshes in PETSc's DMPlex Interface