Generalized postprocessed approximations to the Navier–Stokes equations based on two grids

In this paper we generalize previous postprocessed approximations to the Navier–Stokes equations. The idea of postprocessing in the context of mixed finite element approximations is the following. Once a standard Galerkin mixed finite element approximation is computed using a mesh (we will call coarse) of size H at a fixed time T, we postprocess the approximation using a finer mesh of size h