Boundary regularity for solutions of degenerate elliptic equations
Non-Linear Analysis
SIAM Journal on Mathematical Analysis
Nonlinear Analysis: Theory, Methods & Applications
Mathematics of Computation
Quasi-norm error bounds for the finite element approximation of a non-Newtonian flow
Numerische Mathematik
Finite element approximation of some degenerate monotone quasilinear elliptic systems
SIAM Journal on Numerical Analysis
A Posteriori Error Estimators for Nonconforming Approximation of Some Quasi-Newtonian Flows
SIAM Journal on Numerical Analysis
A Multigrid Algorithm for the p-Laplacian
SIAM Journal on Scientific Computing
Finite Element Method for Elliptic Problems
Finite Element Method for Elliptic Problems
Quasi-Norm Local Error Estimators for p-Laplacian
SIAM Journal on Numerical Analysis
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In this paper, we first derive a posteriori error estimators of residual type for the finite element approximation of the p-Laplacian, and show that they are reliable, and efficient up to higher order terms. We then construct some a posteriori error estimators based on gradient recovery. We further compare the two types of a posteriori error estimators. It is found that there exist some relationships between the two types of estimators, which are similar to those held in the case of the Laplacian. It is shown that the a posteriori error estimators based on gradient recovery are equivalent to the discretization error in a quasi-norm provided the solution is sufficiently smooth and mesh is uniform. Under stronger conditions, superconvergnece properties have been established for the used gradient recovery operator, and then some of the gradient recovery based estimates are further shown to be asymptotically exact to the discretization error in a quasi-norm. Numerical results demonstrating these a posteriori estimates are also presented.