Anisotropic error estimates for the $L^{2}$-projection onto discontinuous finite element spaces
Anisotropic error estimates are determined for the $L^2$-orthogonal projection onto discontinuous finite element spaces in two and three dimensions. These estimates are determined in $W^{m,p}$-seminorms, in which $p \in [1,\infty]$ and $0 \le m \le k+1$, where $k \ge 0$ is the polynomial degree. The analysis relies on a geometric condition that is equivalent to the maximum angle condition. As an application, an apriori error analysis is presented for a hybridizable discontinuous Galerkin discretization of the Poisson problem on two and three dimensional anisotropic meshes.
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