Superconvergence of Differential Structure for Finite Element Methods on Perturbed Surface Meshes

Superconvergence of differential structure on discretized surfaces is studied in this paper.The newly introduced geometric supercloseness provides us with a fundamental tool to prove the superconvergence of gradient recovery on deviated surfaces.An algorithmic framework for gradient recovery without exact geometric information is introduced.Several numerical examples are documented to validate the theoretical results.