Adaptive refinement for arbitrary finite-element spaces with hierarchical bases
Journal of Computational and Applied Mathematics
Error estimators for nonconforming finite element approximations of the Stokes problem
Mathematics of Computation
Local bisection refinement for N-simplicial grids generated by reflection
SIAM Journal on Scientific Computing
A recursive approach to local mesh refinement in two and three dimensions
Journal of Computational and Applied Mathematics
The 4-triangles longest-side partition of triangles and linear refinement algorithms
Mathematics of Computation
A posteriori error estimate for the mixed finite element method
Mathematics of Computation
Locally Adapted Tetrahedral Meshes Using Bisection
SIAM Journal on Scientific Computing
SIAM Journal on Scientific Computing
Data Oscillation and Convergence of Adaptive FEM
SIAM Journal on Numerical Analysis
Adaptive Finite Element Methods with convergence rates
Numerische Mathematik
Robust A Posteriori Error Estimation for Nonconforming Finite Element Approximation
SIAM Journal on Numerical Analysis
A unifying theory of a posteriori error control for nonconforming finite element methods
Numerische Mathematik
Adaptive Finite Element Methods on Quadrilateral Meshes without Hanging Nodes
SIAM Journal on Scientific Computing
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Finite element methods (FEMs) on nonconforming meshes have been much studied in the literature. In all earlier works on such methods , some constraints must be imposed on the degrees of freedom on the edge/face with hanging nodes in order to maintain continuity, which make the numerical implementation more complicated. In this paper, we present two FEMs on quadrilateral nonconforming meshes which are constraint-free. Furthermore, we establish the corresponding residual-based a posteriori error reliability and efficiency estimation for general quadrilateral meshes. We also present extensive numerical testing results to systematically compare the performance among three adaptive quadrilateral FEMs: the constraint-free adaptive $$\mathbb Q _1$$Q1 FEM on quadrilateral nonconforming meshes with hanging nodes developed herein, the adaptive $$\mathbb Q _1$$Q1 FEM based on quadrilateral red-green refinement without any hanging node recently proposed in Zhao et al. (SIAM J Sci Comput 3(4):2099---2120, 2010), and the classical adaptive $$\mathbb Q _1$$Q1 FEM on quadrilateral nonconforming meshes with constraints on hanging nodes. Some extensions are also included in this paper.