We semi-discretize in space a time-dependent Navier-Stokes system on a three-dimensional polyhedron by finite-elements schemes defined on two grids. In the first step, the fully non-linear problem is semi-discretized on a coarse grid, with mesh-size . In the second step, the problem is linearized by substituting into the non-linear term, the velocity computed at step one, and the linearized problem is semi-discretized on a fine grid with mesh-size . This approach is motivated by the fact that, on a convex polyhedron and under adequate assumptions on the data, the contribution of to the error analysis is measured in the norm in space and time, and thus, for the lowest-degree elements, is of the order of . Hence, an error of the order of can be recovered at the second step, provided .
@article{M2AN_2001__35_5_945_0,
author = {Girault, Vivette and Lions, Jacques-Louis},
title = {Two-grid finite-element schemes for the transient Navier-Stokes problem},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
volume = {35},
year = {2001},
pages = {945-980},
mrnumber = {1866277},
zbl = {1032.76032},
language = {en},
url = {http://dml.mathdoc.fr/item/M2AN_2001__35_5_945_0}
}
Girault, Vivette; Lions, Jacques-Louis. Two-grid finite-element schemes for the transient Navier-Stokes problem. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 35 (2001) pp. 945-980. http://gdmltest.u-ga.fr/item/M2AN_2001__35_5_945_0/
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