Top-level heading

Computable a posteriori error bounds for the Stokes problem

Categoria
Seminari di Modellistica Differenziale Numerica
Data e ora inizio evento
Data e ora fine evento
Aula
Sala di Consiglio
Sede

Dipartimento di Matematica Guido Castelnuovo, Università Sapienza Roma

Speaker

Alejandro Allendes, University of Strathclyde, Glasgow

In this talk we will present some recent results on a posteriori error estimation for the Stokes problem. The error estimator is fully computable and present a robust and rigorous bound for the error, providing a stopping criterion for adaptive procedures, whereby elements are selectively refined where the solution is poorly resolved. The analysis is applied first to a nonconforming stable pair of elements (the Fortin-Suli element) and secondly to a wide family of conforming stabilized finite element methods. In the nonconforming case the error estimator can be constructed by taking advantage of the particularities of the Fortin-Suli element and in the conforming case the analysis is based on an equilibrated residual method which allows the application of an a posteriori selection of the stabilization parameter by a derivative free optimization procedure.