Quasi-optimality of a pressure-robust nonconforming finite element method for the Stokes-problem

Linke, A.; Merdon, C.; Neilan, M.; Neumann, F.

doi:10.1090/mcom/3344

Quasi-optimality of a pressure-robust nonconforming finite element method for the Stokes-problem
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by A. Linke, C. Merdon, M. Neilan and F. Neumann PDF

Math. Comp. 87 (2018), 1543-1566 Request permission

Abstract:

Nearly all classical inf-sup stable mixed finite element methods for the incompressible Stokes equations are not pressure-robust, i.e., the velocity error is dependent on the pressure. However, recent results show that pressure-robustness can be recovered by a nonstandard discretization of the right-hand side alone. This variational crime introduces a consistency error in the method which can be estimated in a straightforward manner provided that the exact velocity solution is sufficiently smooth. The purpose of this paper is to analyze the pressure-robust scheme with low regularity. The numerical analysis applies divergence-free $H^1$-conforming Stokes finite element methods as a theoretical tool. As an example, pressure-robust velocity and pressure a priori error estimates will be presented for the (first-order) nonconforming Crouzeix–Raviart element. A key feature in the analysis is the dependence of the errors on the Helmholtz projector of the right-hand side data, and not on the entire data term. Numerical examples illustrate the theoretical results.

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