A flux-free a posteriori error estimator for the incompressible Stokes problem using a mixed FE formulation
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hdl:2117/10309
Tipus de documentArticle
Data publicació2010-08-01
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Abstract
In this contribution, we present an a posteriori error estimator for the incompressible Stokes problem valid
for a conventional mixed FE formulation. Due to the saddle-point property of the problem, conventional error estimators developed for pure minimization problems cannot be utilized straight-forwardly. The new estimator is built up by two key ingredients. At first, a computed error approximation, exactly fulfilling the
continuity equation for the error, is obtained via local Dirichlet problems. Secondly, we adopt the approach of
solving local equilibrated flux-free problems in order to bound the remaining, incompressible, error. In this manner, guaranteed upper and lower bounds, of the velocity “energy norm” of the error as well as goaloriented (linear) output functionals, with respect to a reference (overkill) mesh are obtained. In particular, it should be noted that this approach requires no computation of hybrid fluxes. Furthermore, the estimator is applicable to mixed FE formulations using continuous pressure approximations, such as the Mini and Taylor–
Hood class of elements. In conclusion, a few simple numerical examples are presented, illustrating the accuracy of the error bounds.
CitacióLarsson, F.; Díez, P.; Huerta, A. A flux-free a posteriori error estimator for the incompressible Stokes problem using a mixed FE formulation. "Computer methods in applied mechanics and engineering", 01 Agost 2010, vol. 199, núm. 37-40, p. 2383-2402.
ISSN0045-7825
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