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A variational Germano approach for stabilized finite element methods

2009; Elsevier BV; Volume: 199; Issue: 9-12 Linguagem: Inglês

10.1016/j.cma.2009.10.001

1879-2138

I. Akkerman, Kristoffer G. van der Zee, S.J. Hulshoff,

Advanced Mathematical Modeling in Engineering

In this paper the recently introduced Variational Germano procedure is revisited. The procedure is explained using commutativity diagrams. A general Germano identity for all types of discretizations is derived. This relation is similar to the Variational Germano identity, but is not restricted to variational numerical methods. Based on the general Germano identity an alternative algorithm, in the context of stabilized methods, is proposed. This partitioned algorithm consists of distinct building blocks. Several options for these building blocks are presented and analyzed and their performance is tested using a stabilized finite element formulation for the convection–diffusion equation. Non-homogenous boundary conditions are shown to pose a serious problem for the dissipation method. This is not the case for the least-squares method although here the issue of basis dependence occurs. The latter can be circumvented by minimizing a dual-norm of the weak relation instead of the Euclidean norm of the discrete residual.