Robust a-posteriori estimator for advection-diffusion-reaction problems

Sangalli, Giancarlo

doi:10.1090/S0025-5718-07-02018-2

Robust a-posteriori estimator for advection-diffusion-reaction problems
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Math. Comp. 77 (2008), 41-70 Request permission

Abstract:

We propose an almost-robust residual-based a-posteriori estimator for the advection-diffusion-reaction model problem. The theory is developed in the one-dimensional setting. The numerical error is measured with respect to a norm which was introduced by the author in 2005 and somehow plays the role that the energy norm has with respect to symmetric and coercive differential operators. In particular, the mentioned norm possesses features that allow us to obtain a meaningful a-posteriori estimator, robust up to a $\sqrt {\log (Pe)}$ factor, where $Pe$ is the global Péclet number of the problem. Various numerical tests are performed in one dimension, to confirm the theoretical results and show that the proposed estimator performs better than the usual one known in literature. We also consider a possible two-dimensional extension of our result and only present a few basic numerical tests, indicating that the estimator seems to preserve the good features of the one-dimensional setting.

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