We consider the lowest-order Raviart-Thomas mixed finite element method for second-order elliptic problems on simplicial meshes in two and three space dimensions. This method produces saddle-point problems for scalar and flux unknowns. We show how to easily and locally eliminate the flux unknowns, which implies the equivalence between this method and a particular multi-point finite volume scheme, without any approximate numerical integration. The matrix of the final linear system is sparse, positive definite for a large class of problems, but in general nonsymmetric. We next show that these ideas also apply to mixed and upwind-mixed finite element discretizations of nonlinear parabolic convection-diffusion-reaction problems. Besides the theoretical relationship between the two methods, the results allow for important computational savings in the mixed finite element method, which we finally illustrate on a set of numerical experiments.
@article{M2AN_2006__40_2_367_0, author = {Vohral\'\i k, Martin}, title = {Equivalence between lowest-order mixed finite element and multi-point finite volume methods on simplicial meshes}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique}, volume = {40}, year = {2006}, pages = {367-391}, doi = {10.1051/m2an:2006013}, mrnumber = {2241828}, zbl = {1116.65121}, language = {en}, url = {http://dml.mathdoc.fr/item/M2AN_2006__40_2_367_0} }
Vohralík, Martin. Equivalence between lowest-order mixed finite element and multi-point finite volume methods on simplicial meshes. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 40 (2006) pp. 367-391. doi : 10.1051/m2an:2006013. http://gdmltest.u-ga.fr/item/M2AN_2006__40_2_367_0/
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