Oscillation-free numerical schemes for Biot's model and their iterative coupling solution

TL;DR

This paper introduces a new stabilization technique for Biot's model that eliminates pressure oscillations and enables stable iterative coupling of fluid and mechanical problems, demonstrated through numerical experiments.

Contribution

A novel stabilization method for Biot's model that ensures oscillation-free pressure solutions and supports convergent iterative coupling without extra stabilization terms.

Findings

Stabilized scheme removes non-physical pressure oscillations.

Iterative coupling converges without additional stabilization.

Numerical results confirm robustness across parameters.

Abstract

In this work, we present a new stabilization method aimed at removing spurious oscillations in the pressure approximation of Biot's model for poroelasticity with low permeabilities and/or small time steps. We consider different finite-element discretizations and illustrate how not only does such a stabilized scheme provide numerical solutions that are free of non-physical oscillations, but it also allows one to iterate the fluid and mechanics problems in a fashion similar to the well-known fixed-stress split method. The resulting solution method is convergent without the necessity for additional terms to stabilize the iteration. Finally, we present numerical results illustrating the robust behavior of both the stabilization and iterative solver with respect to the physical and discretization parameters of the model.