In this paper, a new pressure stabilized finite element method is analyzed for solving the Stokes equations. The key feature of the method is using the curl integral instead of the standard Dirichlet integral and using the pressure stabilization instead of the inf–sup condition. Thus, the method is very flexibly applicable to two problems of Stokes equations in terms of velocity and pressure with either pressure-Dirichlet boundary condition or velocity-Dirichlet boundary condition. For both Stokes problems, the finite element scheme and the finite element space of velocity are the same and one, where only the finite element spaces of pressure have small differences. A general analysis of stability and error estimates is developed and applications to both Stokes problems are further analyzed. The method covers the low regularity solution of very weak non H 1 space solution of Stokes problem of pressure-Dirichlet boundary condition as well as higher regularity solutions of Stokes problems of either pressure-Dirichlet boundary condition or velocity-Dirichlet boundary condition. Numerical results are presented to illustrate the performance of the method and to confirm the theoretical results.
Journal of Computational and Applied Mathematics – Elsevier
Published: Aug 1, 2018
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