Stabilization procedures in coupled poromechanics problems: A critical assessment

作者：Preisig Matthias^*; Prevost Jean H

来源：International Journal for Numerical and Analytical Methods in Geomechanics, 2011, 35(11): 1207-1225.

DOI：10.1002/nag.951

• poromechanics
• stabilized finite elements
• fluid pressure Laplacian
• finite increment calculus
• bubble functions

Numerical solutions for problems in coupled poromechanics suffer from spurious pressure oscillations when small time increments are used. This has prompted many researchers to develop methods to overcome these oscillations. In this paper, we present an overview of the methods that in our view are most promising. In particular we investigate several stabilized procedures, namely the fluid pressure Laplacian stabilization (FPL), a stabilization that uses bubble functions to resolve the fine-scale solution within elements, and a method derived by using finite increment calculus (FIC). On a simple one-dimensional test problem, we investigate stability of the three methods and show that the approach using bubble functions does not remove oscillations for all time step sizes. On the other hand, the analysis reveals that FIC stabilizes the pressure for all time step sizes, and it leads to a definition of the stabilization parameter in the case of the FPL-stabilization. Numerical tests in one and two dimensions on 4-noded bilinear and linear triangular elements confirm the effectiveness of both the FPL- and the FIC-stabilizations schemes for linear and nonlinear problems.

• 出版日期2011-8-10