Fig. 1
From: Multilevel preconditioners for embedded enriched partition of unity approximations
Sketch of smooth model problem in two dimensions depicting the employed partitioning of the domain \(\Omega \) into \(\Omega _{\mathrm {HOST, FT}}\) (drak gray), \(\Omega _\Phi =\Omega _{\mathrm {HOST}}\cap \Omega _{\mathrm {ENR}}\) (light gray), and \(\Omega _{\mathrm {ENR, FT}}\) (white). The boundary data for this model problem is given by \(g=0\) on \(\Gamma _D\) and \(h=(1, 1)^T\cdot n\) on \(\Gamma _N\) where n denotes the outer normal