Figure 1From: Accurate and efficient numerical solutions for elliptic obstacle problems A non-matching grid: The true solution u (red solid curve) and the numerical solution on the non-matching grid \(\pmb{u_{h}}\) (blue dashed curve). Here the obstacle is the shaded region, \(u(x_{0})=u_{h}(x_{0})=\varphi (x_{0})=0\), and \(u(x_{5})=u_{h}(x_{5})=\varphi (x_{5})=1\).Back to article page