FreeFem++ scripts for a posteriori error estimates via equilibrated fluxes
Martin Vohralík

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Description

• scripts to be used with FreeFem++
• linear reaction–diffusion problem
• two space dimensions
• guaranteed energy error upper bound
• robust energy error lower bound
• flux equilibration
• easy to understand and modify but not meant for speed
• following Smears, I., Vohralík, M. Simple and robust equilibrated flux a posteriori estimates for singularly perturbed reaction–diffusion problems. ESAIM Math. Model. Numer. Anal. (2020), DOI 10.1051/m2an/2020034, Journal version, preprint .

a simple example script RD_simple.edp
the full script used for the numerical experiments RD_full.edp

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