Pressure-improved Scott-Vogelius type elements
arxiv(2024)
摘要
The Scott-Vogelius element is a popular finite element for the discretization
of the Stokes equations which enjoys inf-sup stability and gives
divergence-free velocity approximation. However, it is well known that the
convergence rates for the discrete pressure deteriorate in the presence of
certain critical vertices in a triangulation of the domain. Modifications
of the Scott-Vogelius element such as the recently introduced pressure-wired
Stokes element also suffer from this effect. In this paper we introduce a
simple modification strategy for these pressure spaces that preserves the
inf-sup stability while the pressure converges at an optimal rate.
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