hal-01133268 title_s Gradient Schemes for incompressible steady Navier-Stokes problem auteur Robert Eymard, Pierre Feron, Cindy Guichard fichier_hal https://hal.archives-ouvertes.fr/hal-01133268/document annee 2015 conference MAMERN VI–2015: 6 th International Conference on Approximation Methods and Numerical Modelling in Environment and Natural Resources