Multigrid methods for nonconforming finite element methods
1990
The present paper analyzes a multigrid algorithm for the Crouzeix–Raviart discretization of the Poisson and Stokes equations in two and three dimensions. The central point is the construction of easily computable $L^2 $-projections based on suitable quadrature rules for the transfer from coarse to fine grids and vice versa.
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