We derive a residual based a posteriori error estimate for the outer normal flux of approximations to the diffusion problem with variable coefficient. By analyzing the solution of the adjoint problem, we show that error indicators in the bulk may be defined to be of higher order than those close to the boundary, which leads to more economic meshes. The theory is illustrated with some numerical examples.
An a posteriori error estimate of the outer normal derivative using dual weights
S Bertoluzza;
2022
Abstract
We derive a residual based a posteriori error estimate for the outer normal flux of approximations to the diffusion problem with variable coefficient. By analyzing the solution of the adjoint problem, we show that error indicators in the bulk may be defined to be of higher order than those close to the boundary, which leads to more economic meshes. The theory is illustrated with some numerical examples.File in questo prodotto:
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