English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This article on nonconforming schemes for  m  harmonic problems simultaneously treats the Crouzeix–Raviart (m=1{m=1}) and the Morley finite elements (m=2{m=2}) for the original and for modified right-hand side  F  in the dual spaceV*:=H-m⁢(Ω){V^{*}:=H^{-m}(\Omega)}to the energy spaceV:=H0m⁢(Ω){V:=H^{m}_{0}(\Omega)}. The smootherJ:Vnc→V{J:V_{\mathrm{nc}}\to V}in this paper is a companion operator, that is a linear and bounded right-inverse to the nonconforming interpolation operatorInc:V→Vnc{I_{\mathrm{nc}}:V\to V_{\mathrm{nc}}}, and modifies the discrete right-hand sideFh:=F∘J∈Vnc*{F_{h}:=F\circ J\in V_{\mathrm{nc}}^{*}}. The best-approximation property of the modified scheme from Veeser et al. (2018) is recovered and complemented with an analysis of the convergence rates in weaker Sobolev norms. Examples with oscillating data show that the original method may fail to enjoy the best-approximation property but can also be better than the modified scheme. The a posteriori analysis of this paper concerns data oscillations of various types in a class of right-hand sidesF∈V*{F\in V^{*}}. The reliable error estimates involve explicit constants and can be recommended for explicit error control of the piecewise energy norm. The efficiency follows solely up to data oscillations and examples illustrate this can be problematic.

A Priori and a Posteriori Error Analysis of the Crouzeix–Raviart and Morley FEM with Original and Modified Right-Hand Sides