A generic discretisation of fourth-order obstacle problems
摘要
Utilising a generic framework, this paper develops a new convergence analysis of various approximation methods for fourth-order variational inequalities (obstacle problems). For the convergence proof, an unrestricted approach is adopted to avoid non-physical conditions on continuous solutions. This analysis presents the first study to investigate a unified framework for both conforming and non-conforming schemes for the studied problem. It also enables us to apply a polytopal scheme for the fourth-order VIs and produce numerical results that highlight the scheme’s accuracy.