Fast estimation of discretization error for FE problems solved by domain decomposition

Augustin Parret-Fréaud (1) , Christian Rey (1) , Pierre Gosselet (1) , Frédéric Feyel (2)

1 LMT - Laboratoire de Mécanique et Technologie
2 ONERA - The French Aerospace Lab [Châtillon]

This paper presents a strategy for a posteriori error estimation for substructured problems solved by non-overlapping domain decomposition methods. We focus on global estimates of the discretization error obtained through the error in constitutive relation for linear mechanical problems. Our method allows to compute error estimate in a fully parallel way for both primal (BDD) and dual (FETI) approaches of non-overlapping domain decomposition whatever the state (converged or not) of the associated iterative solver. Results obtained on an academic problem show that the strategy we propose is efficient in the sense that correct estimation is obtained with fully parallel computations; they also indicate that the estimation of the discretization error reaches sufficient precision in very few iterations of the domain decomposition solver, which enables to consider highly effective adaptive computational strategies.

Mots clés: Verification; Error in constitutive relation; Non overlapping domain decomposition; FETI; BDD

Domaines: Mécanique des structures [physics.class-ph]; Mécanique des structures [physics.class-ph]

Augustin Parret-Fréaud, Christian Rey, Pierre Gosselet, Frédéric Feyel. Fast estimation of discretization error for FE problems solved by domain decomposition. Computer Methods in Applied Mechanics and Engineering, 2010, 199 (49-52), pp.3315-3323. ⟨10.1016/j.cma.2010.07.002⟩. ⟨hal-00537804v2⟩