Error Estimates with Post-Processing for Nonconforming Finite Elements
Friedhelm Schieweck (2010)
ESAIM: Mathematical Modelling and Numerical Analysis
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For a nonconforming finite element approximation of an elliptic model problem, we propose error estimates in the energy norm which use as an additive term the “post-processing error” between the original nonconforming finite element solution and an easy computable conforming approximation of that solution. Thus, for the error analysis, the existing theory from the conforming case can be used together with some simple additional arguments. As an essential point, the property is...